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Python 3.6.5 Documentation > "turtle" — Turtle graphics

"turtle" — Turtle graphics
**************************

**Source code:** Lib/turtle.py

======================================================================

Introduction
============

Turtle graphics is a popular way for introducing programming to kids.
It was part of the original Logo programming language developed by
Wally Feurzig and Seymour Papert in 1966.

Imagine a robotic turtle starting at (0, 0) in the x-y plane. After
an "import turtle", give it the command "turtle.forward(15)", and it
moves (on-screen!) 15 pixels in the direction it is facing, drawing a
line as it moves. Give it the command "turtle.right(25)", and it
rotates in-place 25 degrees clockwise.

Turtle star
^^^^^^^^^^^

Turtle can draw intricate shapes using programs that repeat simple
moves.

[image]

from turtle import *
color('red', 'yellow')
begin_fill()
while True:
forward(200)
left(170)
if abs(pos()) < 1:
break
end_fill()
done()

By combining together these and similar commands, intricate shapes and
pictures can easily be drawn.

The "turtle" module is an extended reimplementation of the same-named
module from the Python standard distribution up to version Python 2.5.

It tries to keep the merits of the old turtle module and to be
(nearly) 100% compatible with it. This means in the first place to
enable the learning programmer to use all the commands, classes and
methods interactively when using the module from within IDLE run with
the "-n" switch.

The turtle module provides turtle graphics primitives, in both object-
oriented and procedure-oriented ways. Because it uses "tkinter" for
the underlying graphics, it needs a version of Python installed with
Tk support.

The object-oriented interface uses essentially two+two classes:

1. The "TurtleScreen" class defines graphics windows as a
playground for the drawing turtles. Its constructor needs a
"tkinter.Canvas" or a "ScrolledCanvas" as argument. It should be
used when "turtle" is used as part of some application.

The function "Screen()" returns a singleton object of a
"TurtleScreen" subclass. This function should be used when "turtle"
is used as a standalone tool for doing graphics. As a singleton
object, inheriting from its class is not possible.

All methods of TurtleScreen/Screen also exist as functions, i.e. as
part of the procedure-oriented interface.

2. "RawTurtle" (alias: "RawPen") defines Turtle objects which draw
on a "TurtleScreen". Its constructor needs a Canvas,
ScrolledCanvas or TurtleScreen as argument, so the RawTurtle
objects know where to draw.

Derived from RawTurtle is the subclass "Turtle" (alias: "Pen"),
which draws on “the” "Screen" instance which is automatically
created, if not already present.

All methods of RawTurtle/Turtle also exist as functions, i.e. part
of the procedure-oriented interface.

The procedural interface provides functions which are derived from the
methods of the classes "Screen" and "Turtle". They have the same
names as the corresponding methods. A screen object is automatically
created whenever a function derived from a Screen method is called.
An (unnamed) turtle object is automatically created whenever any of
the functions derived from a Turtle method is called.

To use multiple turtles on a screen one has to use the object-oriented
interface.

Note: In the following documentation the argument list for functions
is given. Methods, of course, have the additional first argument
*self* which is omitted here.

Overview of available Turtle and Screen methods
===============================================

Turtle methods
--------------

Tell Turtle’s state
"position()" | "pos()"
"towards()"
"xcor()"
"ycor()"
"heading()"
"distance()"

Setting and measurement
"degrees()"
"radians()"

Color control
"color()"
"pencolor()"
"fillcolor()"

Filling
"filling()"
"begin_fill()"
"end_fill()"

More drawing control
"reset()"
"clear()"
"write()"

Turtle state
Visibility
"showturtle()" | "st()"
"hideturtle()" | "ht()"
"isvisible()"

Appearance
"shape()"
"resizemode()"
"shapesize()" | "turtlesize()"
"shearfactor()"
"settiltangle()"
"tiltangle()"
"tilt()"
"shapetransform()"
"get_shapepoly()"

Using events
"onclick()"
"onrelease()"
"ondrag()"

Special Turtle methods
"begin_poly()"
"end_poly()"
"get_poly()"
"clone()"
"getturtle()" | "getpen()"
"getscreen()"
"setundobuffer()"
"undobufferentries()"

Methods of TurtleScreen/Screen
------------------------------

Window control
"bgcolor()"
"bgpic()"
"clear()" | "clearscreen()"
"reset()" | "resetscreen()"
"screensize()"
"setworldcoordinates()"

Animation control
"delay()"
"tracer()"
"update()"

Using screen events
"listen()"
"onkey()" | "onkeyrelease()"
"onkeypress()"
"onclick()" | "onscreenclick()"
"ontimer()"
"mainloop()" | "done()"

Settings and special methods
"mode()"
"colormode()"
"getcanvas()"
"getshapes()"
"register_shape()" | "addshape()"
"turtles()"
"window_height()"
"window_width()"

Input methods
"textinput()"
"numinput()"

Methods specific to Screen
"bye()"
"exitonclick()"
"setup()"
"title()"

Methods of RawTurtle/Turtle and corresponding functions
=======================================================

Most of the examples in this section refer to a Turtle instance called
"turtle".

Turtle motion
-------------

turtle.forward(distance)
turtle.fd(distance)

Parameters:
**distance** – a number (integer or float)

Move the turtle forward by the specified *distance*, in the
direction the turtle is headed.

>>> turtle.position()
(0.00,0.00)
>>> turtle.forward(25)
>>> turtle.position()
(25.00,0.00)
>>> turtle.forward(-75)
>>> turtle.position()
(-50.00,0.00)

turtle.back(distance)
turtle.bk(distance)
turtle.backward(distance)

Parameters:
**distance** – a number

Move the turtle backward by *distance*, opposite to the direction
the turtle is headed. Do not change the turtle’s heading.

>>> turtle.position()
(0.00,0.00)
>>> turtle.backward(30)
>>> turtle.position()
(-30.00,0.00)

turtle.right(angle)
turtle.rt(angle)

Parameters:
**angle** – a number (integer or float)

Turn turtle right by *angle* units. (Units are by default degrees,
but can be set via the "degrees()" and "radians()" functions.)
Angle orientation depends on the turtle mode, see "mode()".

>>> turtle.heading()
22.0
>>> turtle.right(45)
>>> turtle.heading()
337.0

turtle.left(angle)
turtle.lt(angle)

Parameters:
**angle** – a number (integer or float)

Turn turtle left by *angle* units. (Units are by default degrees,
but can be set via the "degrees()" and "radians()" functions.)
Angle orientation depends on the turtle mode, see "mode()".

>>> turtle.heading()
22.0
>>> turtle.left(45)
>>> turtle.heading()
67.0

turtle.goto(x, y=None)
turtle.setpos(x, y=None)
turtle.setposition(x, y=None)

Parameters:
* **x** – a number or a pair/vector of numbers

* **y** – a number or "None"

If *y* is "None", *x* must be a pair of coordinates or a "Vec2D"
(e.g. as returned by "pos()").

Move turtle to an absolute position. If the pen is down, draw
line. Do not change the turtle’s orientation.

>>> tp = turtle.pos()
>>> tp
(0.00,0.00)
>>> turtle.setpos(60,30)
>>> turtle.pos()
(60.00,30.00)
>>> turtle.setpos((20,80))
>>> turtle.pos()
(20.00,80.00)
>>> turtle.setpos(tp)
>>> turtle.pos()
(0.00,0.00)

turtle.setx(x)

Parameters:
**x** – a number (integer or float)

Set the turtle’s first coordinate to *x*, leave second coordinate
unchanged.

>>> turtle.position()
(0.00,240.00)
>>> turtle.setx(10)
>>> turtle.position()
(10.00,240.00)

turtle.sety(y)

Parameters:
**y** – a number (integer or float)

Set the turtle’s second coordinate to *y*, leave first coordinate
unchanged.

>>> turtle.position()
(0.00,40.00)
>>> turtle.sety(-10)
>>> turtle.position()
(0.00,-10.00)

turtle.setheading(to_angle)
turtle.seth(to_angle)

Parameters:
**to_angle** – a number (integer or float)

Set the orientation of the turtle to *to_angle*. Here are some
common directions in degrees:

>>> turtle.setheading(90)
>>> turtle.heading()
90.0

turtle.home()

Move turtle to the origin – coordinates (0,0) – and set its heading
to its start-orientation (which depends on the mode, see "mode()").

>>> turtle.heading()
90.0
>>> turtle.position()
(0.00,-10.00)
>>> turtle.home()
>>> turtle.position()
(0.00,0.00)
>>> turtle.heading()
0.0

turtle.circle(radius, extent=None, steps=None)

Parameters:
* **radius** – a number

* **extent** – a number (or "None")

* **steps** – an integer (or "None")

Draw a circle with given *radius*. The center is *radius* units
left of the turtle; *extent* – an angle – determines which part of
the circle is drawn. If *extent* is not given, draw the entire
circle. If *extent* is not a full circle, one endpoint of the arc
is the current pen position. Draw the arc in counterclockwise
direction if *radius* is positive, otherwise in clockwise
direction. Finally the direction of the turtle is changed by the
amount of *extent*.

As the circle is approximated by an inscribed regular polygon,
*steps* determines the number of steps to use. If not given, it
will be calculated automatically. May be used to draw regular
polygons.

>>> turtle.home()
>>> turtle.position()
(0.00,0.00)
>>> turtle.heading()
0.0
>>> turtle.circle(50)
>>> turtle.position()
(-0.00,0.00)
>>> turtle.heading()
0.0
>>> turtle.circle(120, 180) # draw a semicircle
>>> turtle.position()
(0.00,240.00)
>>> turtle.heading()
180.0

turtle.dot(size=None, *color)

Parameters:
* **size** – an integer >= 1 (if given)

* **color** – a colorstring or a numeric color tuple

Draw a circular dot with diameter *size*, using *color*. If *size*
is not given, the maximum of pensize+4 and 2*pensize is used.

>>> turtle.home()
>>> turtle.dot()
>>> turtle.fd(50); turtle.dot(20, "blue"); turtle.fd(50)
>>> turtle.position()
(100.00,-0.00)
>>> turtle.heading()
0.0

turtle.stamp()

Stamp a copy of the turtle shape onto the canvas at the current
turtle position. Return a stamp_id for that stamp, which can be
used to delete it by calling "clearstamp(stamp_id)".

>>> turtle.color("blue")
>>> turtle.stamp()
11
>>> turtle.fd(50)

turtle.clearstamp(stampid)

Parameters:
**stampid** – an integer, must be return value of previous
"stamp()" call

Delete stamp with given *stampid*.

>>> turtle.position()
(150.00,-0.00)
>>> turtle.color("blue")
>>> astamp = turtle.stamp()
>>> turtle.fd(50)
>>> turtle.position()
(200.00,-0.00)
>>> turtle.clearstamp(astamp)
>>> turtle.position()
(200.00,-0.00)

turtle.clearstamps(n=None)

Parameters:
**n** – an integer (or "None")

Delete all or first/last *n* of turtle’s stamps. If *n* is "None",
delete all stamps, if *n* > 0 delete first *n* stamps, else if *n*
< 0 delete last *n* stamps.

>>> for i in range(8):
... turtle.stamp(); turtle.fd(30)
13
14
15
16
17
18
19
20
>>> turtle.clearstamps(2)
>>> turtle.clearstamps(-2)
>>> turtle.clearstamps()

turtle.undo()

Undo (repeatedly) the last turtle action(s). Number of available
undo actions is determined by the size of the undobuffer.

>>> for i in range(4):
... turtle.fd(50); turtle.lt(80)
...
>>> for i in range(8):
... turtle.undo()

turtle.speed(speed=None)

Parameters:
**speed** – an integer in the range 0..10 or a speedstring (see
below)

Set the turtle’s speed to an integer value in the range 0..10. If
no argument is given, return current speed.

If input is a number greater than 10 or smaller than 0.5, speed is
set to 0. Speedstrings are mapped to speedvalues as follows:

* “fastest”: 0

* “fast”: 10

* “normal”: 6

* “slow”: 3

* “slowest”: 1

Speeds from 1 to 10 enforce increasingly faster animation of line
drawing and turtle turning.

Attention: *speed* = 0 means that *no* animation takes place.
forward/back makes turtle jump and likewise left/right make the
turtle turn instantly.

>>> turtle.speed()
3
>>> turtle.speed('normal')
>>> turtle.speed()
6
>>> turtle.speed(9)
>>> turtle.speed()
9

Tell Turtle’s state
-------------------

turtle.position()
turtle.pos()

Return the turtle’s current location (x,y) (as a "Vec2D" vector).

>>> turtle.pos()
(440.00,-0.00)

turtle.towards(x, y=None)

Parameters:
* **x** – a number or a pair/vector of numbers or a turtle
instance

* **y** – a number if *x* is a number, else "None"

Return the angle between the line from turtle position to position
specified by (x,y), the vector or the other turtle. This depends
on the turtle’s start orientation which depends on the mode -
“standard”/”world” or “logo”).

>>> turtle.goto(10, 10)
>>> turtle.towards(0,0)
225.0

turtle.xcor()

Return the turtle’s x coordinate.

>>> turtle.home()
>>> turtle.left(50)
>>> turtle.forward(100)
>>> turtle.pos()
(64.28,76.60)
>>> print(round(turtle.xcor(), 5))
64.27876

turtle.ycor()

Return the turtle’s y coordinate.

>>> turtle.home()
>>> turtle.left(60)
>>> turtle.forward(100)
>>> print(turtle.pos())
(50.00,86.60)
>>> print(round(turtle.ycor(), 5))
86.60254

turtle.heading()

Return the turtle’s current heading (value depends on the turtle
mode, see "mode()").

>>> turtle.home()
>>> turtle.left(67)
>>> turtle.heading()
67.0

turtle.distance(x, y=None)

Parameters:
* **x** – a number or a pair/vector of numbers or a turtle
instance

* **y** – a number if *x* is a number, else "None"

Return the distance from the turtle to (x,y), the given vector, or
the given other turtle, in turtle step units.

>>> turtle.home()
>>> turtle.distance(30,40)
50.0
>>> turtle.distance((30,40))
50.0
>>> joe = Turtle()
>>> joe.forward(77)
>>> turtle.distance(joe)
77.0

Settings for measurement
------------------------

turtle.degrees(fullcircle=360.0)

Parameters:
**fullcircle** – a number

Set angle measurement units, i.e. set number of “degrees” for a
full circle. Default value is 360 degrees.

>>> turtle.home()
>>> turtle.left(90)
>>> turtle.heading()
90.0

Change angle measurement unit to grad (also known as gon,
grade, or gradian and equals 1/100-th of the right angle.)
>>> turtle.degrees(400.0)
>>> turtle.heading()
100.0
>>> turtle.degrees(360)
>>> turtle.heading()
90.0

turtle.radians()

Set the angle measurement units to radians. Equivalent to
"degrees(2*math.pi)".

>>> turtle.home()
>>> turtle.left(90)
>>> turtle.heading()
90.0
>>> turtle.radians()
>>> turtle.heading()
1.5707963267948966

Pen control
-----------

Drawing state
~~~~~~~~~~~~~

turtle.pendown()
turtle.pd()
turtle.down()

Pull the pen down – drawing when moving.

turtle.penup()
turtle.pu()
turtle.up()

Pull the pen up – no drawing when moving.

turtle.pensize(width=None)
turtle.width(width=None)

Parameters:
**width** – a positive number

Set the line thickness to *width* or return it. If resizemode is
set to “auto” and turtleshape is a polygon, that polygon is drawn
with the same line thickness. If no argument is given, the current
pensize is returned.

>>> turtle.pensize()
1
>>> turtle.pensize(10) # from here on lines of width 10 are drawn

turtle.pen(pen=None, **pendict)

Parameters:
* **pen** – a dictionary with some or all of the below listed
keys

* **pendict** – one or more keyword-arguments with the below
listed keys as keywords

Return or set the pen’s attributes in a “pen-dictionary” with the
following key/value pairs:

* “shown”: True/False

* “pendown”: True/False

* “pencolor”: color-string or color-tuple

* “fillcolor”: color-string or color-tuple

* “pensize”: positive number

* “speed”: number in range 0..10

* “resizemode”: “auto” or “user” or “noresize”

* “stretchfactor”: (positive number, positive number)

* “outline”: positive number

* “tilt”: number

This dictionary can be used as argument for a subsequent call to
"pen()" to restore the former pen-state. Moreover one or more of
these attributes can be provided as keyword-arguments. This can be
used to set several pen attributes in one statement.

>>> turtle.pen(fillcolor="black", pencolor="red", pensize=10)
>>> sorted(turtle.pen().items())
[('fillcolor', 'black'), ('outline', 1), ('pencolor', 'red'),
('pendown', True), ('pensize', 10), ('resizemode', 'noresize'),
('shearfactor', 0.0), ('shown', True), ('speed', 9),
('stretchfactor', (1.0, 1.0)), ('tilt', 0.0)]
>>> penstate=turtle.pen()
>>> turtle.color("yellow", "")
>>> turtle.penup()
>>> sorted(turtle.pen().items())[:3]
[('fillcolor', ''), ('outline', 1), ('pencolor', 'yellow')]
>>> turtle.pen(penstate, fillcolor="green")
>>> sorted(turtle.pen().items())[:3]
[('fillcolor', 'green'), ('outline', 1), ('pencolor', 'red')]

turtle.isdown()

Return "True" if pen is down, "False" if it’s up.

>>> turtle.penup()
>>> turtle.isdown()
False
>>> turtle.pendown()
>>> turtle.isdown()
True

Color control
~~~~~~~~~~~~~

turtle.pencolor(*args)

Return or set the pencolor.

Four input formats are allowed:

"pencolor()"
Return the current pencolor as color specification string or as
a tuple (see example). May be used as input to another
color/pencolor/fillcolor call.

"pencolor(colorstring)"
Set pencolor to *colorstring*, which is a Tk color specification
string, such as ""red"", ""yellow"", or ""#33cc8c"".

"pencolor((r, g, b))"
Set pencolor to the RGB color represented by the tuple of *r*,
*g*, and *b*. Each of *r*, *g*, and *b* must be in the range
0..colormode, where colormode is either 1.0 or 255 (see
"colormode()").

"pencolor(r, g, b)"
Set pencolor to the RGB color represented by *r*, *g*, and
*b*. Each of *r*, *g*, and *b* must be in the range
0..colormode.

If turtleshape is a polygon, the outline of that polygon is
drawn with the newly set pencolor.

>>> colormode()
1.0
>>> turtle.pencolor()
'red'
>>> turtle.pencolor("brown")
>>> turtle.pencolor()
'brown'
>>> tup = (0.2, 0.8, 0.55)
>>> turtle.pencolor(tup)
>>> turtle.pencolor()
(0.2, 0.8, 0.5490196078431373)
>>> colormode(255)
>>> turtle.pencolor()
(51.0, 204.0, 140.0)
>>> turtle.pencolor('#32c18f')
>>> turtle.pencolor()
(50.0, 193.0, 143.0)

turtle.fillcolor(*args)

Return or set the fillcolor.

Four input formats are allowed:

"fillcolor()"
Return the current fillcolor as color specification string,
possibly in tuple format (see example). May be used as input to
another color/pencolor/fillcolor call.

"fillcolor(colorstring)"
Set fillcolor to *colorstring*, which is a Tk color
specification string, such as ""red"", ""yellow"", or
""#33cc8c"".

"fillcolor((r, g, b))"
Set fillcolor to the RGB color represented by the tuple of *r*,
*g*, and *b*. Each of *r*, *g*, and *b* must be in the range
0..colormode, where colormode is either 1.0 or 255 (see
"colormode()").

"fillcolor(r, g, b)"
Set fillcolor to the RGB color represented by *r*, *g*, and
*b*. Each of *r*, *g*, and *b* must be in the range
0..colormode.

If turtleshape is a polygon, the interior of that polygon is
drawn with the newly set fillcolor.

>>> turtle.fillcolor("violet")
>>> turtle.fillcolor()
'violet'
>>> col = turtle.pencolor()
>>> col
(50.0, 193.0, 143.0)
>>> turtle.fillcolor(col)
>>> turtle.fillcolor()
(50.0, 193.0, 143.0)
>>> turtle.fillcolor('#ffffff')
>>> turtle.fillcolor()
(255.0, 255.0, 255.0)

turtle.color(*args)

Return or set pencolor and fillcolor.

Several input formats are allowed. They use 0 to 3 arguments as
follows:

"color()"
Return the current pencolor and the current fillcolor as a pair
of color specification strings or tuples as returned by
"pencolor()" and "fillcolor()".

"color(colorstring)", "color((r,g,b))", "color(r,g,b)"
Inputs as in "pencolor()", set both, fillcolor and pencolor, to
the given value.

"color(colorstring1, colorstring2)", "color((r1,g1,b1),
(r2,g2,b2))"
Equivalent to "pencolor(colorstring1)" and
"fillcolor(colorstring2)" and analogously if the other input
format is used.

If turtleshape is a polygon, outline and interior of that
polygon is drawn with the newly set colors.

>>> turtle.color("red", "green")
>>> turtle.color()
('red', 'green')
>>> color("#285078", "#a0c8f0")
>>> color()
((40.0, 80.0, 120.0), (160.0, 200.0, 240.0))

See also: Screen method "colormode()".

Filling
~~~~~~~

turtle.filling()

Return fillstate ("True" if filling, "False" else).

>>> turtle.begin_fill()
>>> if turtle.filling():
... turtle.pensize(5)
... else:
... turtle.pensize(3)

turtle.begin_fill()

To be called just before drawing a shape to be filled.

turtle.end_fill()

Fill the shape drawn after the last call to "begin_fill()".

>>> turtle.color("black", "red")
>>> turtle.begin_fill()
>>> turtle.circle(80)
>>> turtle.end_fill()

More drawing control
~~~~~~~~~~~~~~~~~~~~

turtle.reset()

Delete the turtle’s drawings from the screen, re-center the turtle
and set variables to the default values.

>>> turtle.goto(0,-22)
>>> turtle.left(100)
>>> turtle.position()
(0.00,-22.00)
>>> turtle.heading()
100.0
>>> turtle.reset()
>>> turtle.position()
(0.00,0.00)
>>> turtle.heading()
0.0

turtle.clear()

Delete the turtle’s drawings from the screen. Do not move turtle.
State and position of the turtle as well as drawings of other
turtles are not affected.

turtle.write(arg, move=False, align="left", font=("Arial", 8, "normal"))

Parameters:
* **arg** – object to be written to the TurtleScreen

* **move** – True/False

* **align** – one of the strings “left”, “center” or right”

* **font** – a triple (fontname, fontsize, fonttype)

Write text - the string representation of *arg* - at the current
turtle position according to *align* (“left”, “center” or right”)
and with the given font. If *move* is true, the pen is moved to
the bottom-right corner of the text. By default, *move* is
"False".

>>> turtle.write("Home = ", True, align="center")
>>> turtle.write((0,0), True)

Turtle state
------------

Visibility
~~~~~~~~~~

turtle.hideturtle()
turtle.ht()

Make the turtle invisible. It’s a good idea to do this while
you’re in the middle of doing some complex drawing, because hiding
the turtle speeds up the drawing observably.

>>> turtle.hideturtle()

turtle.showturtle()
turtle.st()

Make the turtle visible.

>>> turtle.showturtle()

turtle.isvisible()

Return "True" if the Turtle is shown, "False" if it’s hidden.

>>> turtle.hideturtle()
>>> turtle.isvisible()
False
>>> turtle.showturtle()
>>> turtle.isvisible()
True

Appearance
~~~~~~~~~~

turtle.shape(name=None)

Parameters:
**name** – a string which is a valid shapename

Set turtle shape to shape with given *name* or, if name is not
given, return name of current shape. Shape with *name* must exist
in the TurtleScreen’s shape dictionary. Initially there are the
following polygon shapes: “arrow”, “turtle”, “circle”, “square”,
“triangle”, “classic”. To learn about how to deal with shapes see
Screen method "register_shape()".

>>> turtle.shape()
'classic'
>>> turtle.shape("turtle")
>>> turtle.shape()
'turtle'

turtle.resizemode(rmode=None)

Parameters:
**rmode** – one of the strings “auto”, “user”, “noresize”

Set resizemode to one of the values: “auto”, “user”, “noresize”.
If *rmode* is not given, return current resizemode. Different
resizemodes have the following effects:

* “auto”: adapts the appearance of the turtle corresponding to
the value of pensize.

* “user”: adapts the appearance of the turtle according to the
values of stretchfactor and outlinewidth (outline), which are set
by "shapesize()".

* “noresize”: no adaption of the turtle’s appearance takes place.

resizemode(“user”) is called by "shapesize()" when used with
arguments.

>>> turtle.resizemode()
'noresize'
>>> turtle.resizemode("auto")
>>> turtle.resizemode()
'auto'

turtle.shapesize(stretch_wid=None, stretch_len=None, outline=None)
turtle.turtlesize(stretch_wid=None, stretch_len=None, outline=None)

Parameters:
* **stretch_wid** – positive number

* **stretch_len** – positive number

* **outline** – positive number

Return or set the pen’s attributes x/y-stretchfactors and/or
outline. Set resizemode to “user”. If and only if resizemode is
set to “user”, the turtle will be displayed stretched according to
its stretchfactors: *stretch_wid* is stretchfactor perpendicular to
its orientation, *stretch_len* is stretchfactor in direction of its
orientation, *outline* determines the width of the shapes’s
outline.

>>> turtle.shapesize()
(1.0, 1.0, 1)
>>> turtle.resizemode("user")
>>> turtle.shapesize(5, 5, 12)
>>> turtle.shapesize()
(5, 5, 12)
>>> turtle.shapesize(outline=8)
>>> turtle.shapesize()
(5, 5, 8)

turtle.shearfactor(shear=None)

Parameters:
**shear** – number (optional)

Set or return the current shearfactor. Shear the turtleshape
according to the given shearfactor shear, which is the tangent of
the shear angle. Do *not* change the turtle’s heading (direction of
movement). If shear is not given: return the current shearfactor,
i. e. the tangent of the shear angle, by which lines parallel to
the heading of the turtle are sheared.

>>> turtle.shape("circle")
>>> turtle.shapesize(5,2)
>>> turtle.shearfactor(0.5)
>>> turtle.shearfactor()
0.5

turtle.tilt(angle)

Parameters:
**angle** – a number

Rotate the turtleshape by *angle* from its current tilt-angle, but
do *not* change the turtle’s heading (direction of movement).

>>> turtle.reset()
>>> turtle.shape("circle")
>>> turtle.shapesize(5,2)
>>> turtle.tilt(30)
>>> turtle.fd(50)
>>> turtle.tilt(30)
>>> turtle.fd(50)

turtle.settiltangle(angle)

Parameters:
**angle** – a number

Rotate the turtleshape to point in the direction specified by
*angle*, regardless of its current tilt-angle. *Do not* change the
turtle’s heading (direction of movement).

>>> turtle.reset()
>>> turtle.shape("circle")
>>> turtle.shapesize(5,2)
>>> turtle.settiltangle(45)
>>> turtle.fd(50)
>>> turtle.settiltangle(-45)
>>> turtle.fd(50)

Deprecated since version 3.1.

turtle.tiltangle(angle=None)

Parameters:
**angle** – a number (optional)

Set or return the current tilt-angle. If angle is given, rotate the
turtleshape to point in the direction specified by angle,
regardless of its current tilt-angle. Do *not* change the turtle’s
heading (direction of movement). If angle is not given: return the
current tilt-angle, i. e. the angle between the orientation of the
turtleshape and the heading of the turtle (its direction of
movement).

>>> turtle.reset()
>>> turtle.shape("circle")
>>> turtle.shapesize(5,2)
>>> turtle.tilt(45)
>>> turtle.tiltangle()
45.0

turtle.shapetransform(t11=None, t12=None, t21=None, t22=None)

Parameters:
* **t11** – a number (optional)

* **t12** – a number (optional)

* **t21** – a number (optional)

* **t12** – a number (optional)

Set or return the current transformation matrix of the turtle
shape.

If none of the matrix elements are given, return the transformation
matrix as a tuple of 4 elements. Otherwise set the given elements
and transform the turtleshape according to the matrix consisting of
first row t11, t12 and second row t21, 22. The determinant t11 *
t22 - t12 * t21 must not be zero, otherwise an error is raised.
Modify stretchfactor, shearfactor and tiltangle according to the
given matrix.

>>> turtle = Turtle()
>>> turtle.shape("square")
>>> turtle.shapesize(4,2)
>>> turtle.shearfactor(-0.5)
>>> turtle.shapetransform()
(4.0, -1.0, -0.0, 2.0)

turtle.get_shapepoly()

Return the current shape polygon as tuple of coordinate pairs. This
can be used to define a new shape or components of a compound
shape.

>>> turtle.shape("square")
>>> turtle.shapetransform(4, -1, 0, 2)
>>> turtle.get_shapepoly()
((50, -20), (30, 20), (-50, 20), (-30, -20))

Using events
------------

turtle.onclick(fun, btn=1, add=None)

Parameters:
* **fun** – a function with two arguments which will be called
with the coordinates of the clicked point on the canvas

* **num** – number of the mouse-button, defaults to 1 (left
mouse button)

* **add** – "True" or "False" – if "True", a new binding will
be added, otherwise it will replace a former binding

Bind *fun* to mouse-click events on this turtle. If *fun* is
"None", existing bindings are removed. Example for the anonymous
turtle, i.e. the procedural way:

>>> def turn(x, y):
... left(180)
...
>>> onclick(turn) # Now clicking into the turtle will turn it.
>>> onclick(None) # event-binding will be removed

turtle.onrelease(fun, btn=1, add=None)

Parameters:
* **fun** – a function with two arguments which will be called
with the coordinates of the clicked point on the canvas

* **num** – number of the mouse-button, defaults to 1 (left
mouse button)

* **add** – "True" or "False" – if "True", a new binding will
be added, otherwise it will replace a former binding

Bind *fun* to mouse-button-release events on this turtle. If *fun*
is "None", existing bindings are removed.

>>> class MyTurtle(Turtle):
... def glow(self,x,y):
... self.fillcolor("red")
... def unglow(self,x,y):
... self.fillcolor("")
...
>>> turtle = MyTurtle()
>>> turtle.onclick(turtle.glow) # clicking on turtle turns fillcolor red,
>>> turtle.onrelease(turtle.unglow) # releasing turns it to transparent.

turtle.ondrag(fun, btn=1, add=None)

Parameters:
* **fun** – a function with two arguments which will be called
with the coordinates of the clicked point on the canvas

* **num** – number of the mouse-button, defaults to 1 (left
mouse button)

* **add** – "True" or "False" – if "True", a new binding will
be added, otherwise it will replace a former binding

Bind *fun* to mouse-move events on this turtle. If *fun* is
"None", existing bindings are removed.

Remark: Every sequence of mouse-move-events on a turtle is preceded
by a mouse-click event on that turtle.

>>> turtle.ondrag(turtle.goto)

Subsequently, clicking and dragging the Turtle will move it across
the screen thereby producing handdrawings (if pen is down).

Special Turtle methods
----------------------

turtle.begin_poly()

Start recording the vertices of a polygon. Current turtle position
is first vertex of polygon.

turtle.end_poly()

Stop recording the vertices of a polygon. Current turtle position
is last vertex of polygon. This will be connected with the first
vertex.

turtle.get_poly()

Return the last recorded polygon.

>>> turtle.home()
>>> turtle.begin_poly()
>>> turtle.fd(100)
>>> turtle.left(20)
>>> turtle.fd(30)
>>> turtle.left(60)
>>> turtle.fd(50)
>>> turtle.end_poly()
>>> p = turtle.get_poly()
>>> register_shape("myFavouriteShape", p)

turtle.clone()

Create and return a clone of the turtle with same position, heading
and turtle properties.

>>> mick = Turtle()
>>> joe = mick.clone()

turtle.getturtle()
turtle.getpen()

Return the Turtle object itself. Only reasonable use: as a
function to return the “anonymous turtle”:

>>> pet = getturtle()
>>> pet.fd(50)
>>> pet
<turtle.Turtle object at 0x...>

turtle.getscreen()

Return the "TurtleScreen" object the turtle is drawing on.
TurtleScreen methods can then be called for that object.

>>> ts = turtle.getscreen()
>>> ts
<turtle._Screen object at 0x...>
>>> ts.bgcolor("pink")

turtle.setundobuffer(size)

Parameters:
**size** – an integer or "None"

Set or disable undobuffer. If *size* is an integer an empty
undobuffer of given size is installed. *size* gives the maximum
number of turtle actions that can be undone by the "undo()"
method/function. If *size* is "None", the undobuffer is disabled.

>>> turtle.setundobuffer(42)

turtle.undobufferentries()

Return number of entries in the undobuffer.

>>> while undobufferentries():
... undo()

Compound shapes
---------------

To use compound turtle shapes, which consist of several polygons of
different color, you must use the helper class "Shape" explicitly as
described below:

1. Create an empty Shape object of type “compound”.

2. Add as many components to this object as desired, using the
"addcomponent()" method.

For example:

>>> s = Shape("compound")
>>> poly1 = ((0,0),(10,-5),(0,10),(-10,-5))
>>> s.addcomponent(poly1, "red", "blue")
>>> poly2 = ((0,0),(10,-5),(-10,-5))
>>> s.addcomponent(poly2, "blue", "red")

3. Now add the Shape to the Screen’s shapelist and use it:

>>> register_shape("myshape", s)
>>> shape("myshape")

Note: The "Shape" class is used internally by the "register_shape()"
method in different ways. The application programmer has to deal
with the Shape class *only* when using compound shapes like shown
above!

Methods of TurtleScreen/Screen and corresponding functions
==========================================================

Most of the examples in this section refer to a TurtleScreen instance
called "screen".

Window control
--------------

turtle.bgcolor(*args)

Parameters:
**args** – a color string or three numbers in the range
0..colormode or a 3-tuple of such numbers

Set or return background color of the TurtleScreen.

>>> screen.bgcolor("orange")
>>> screen.bgcolor()
'orange'
>>> screen.bgcolor("#800080")
>>> screen.bgcolor()
(128.0, 0.0, 128.0)

turtle.bgpic(picname=None)

Parameters:
**picname** – a string, name of a gif-file or ""nopic"", or
"None"

Set background image or return name of current backgroundimage. If
*picname* is a filename, set the corresponding image as background.
If *picname* is ""nopic"", delete background image, if present. If
*picname* is "None", return the filename of the current
backgroundimage.

>>> screen.bgpic()
'nopic'
>>> screen.bgpic("landscape.gif")
>>> screen.bgpic()
"landscape.gif"

turtle.clear()
turtle.clearscreen()

Delete all drawings and all turtles from the TurtleScreen. Reset
the now empty TurtleScreen to its initial state: white background,
no background image, no event bindings and tracing on.

Note: This TurtleScreen method is available as a global function
only under the name "clearscreen". The global function "clear"
is a different one derived from the Turtle method "clear".

turtle.reset()
turtle.resetscreen()

Reset all Turtles on the Screen to their initial state.

Note: This TurtleScreen method is available as a global function
only under the name "resetscreen". The global function "reset"
is another one derived from the Turtle method "reset".

turtle.screensize(canvwidth=None, canvheight=None, bg=None)

Parameters:
* **canvwidth** – positive integer, new width of canvas in
pixels

* **canvheight** – positive integer, new height of canvas in
pixels

* **bg** – colorstring or color-tuple, new background color

If no arguments are given, return current (canvaswidth,
canvasheight). Else resize the canvas the turtles are drawing on.
Do not alter the drawing window. To observe hidden parts of the
canvas, use the scrollbars. With this method, one can make visible
those parts of a drawing which were outside the canvas before.

>>> screen.screensize()
(400, 300)
>>> screen.screensize(2000,1500)
>>> screen.screensize()
(2000, 1500)

e.g. to search for an erroneously escaped turtle ;-)

turtle.setworldcoordinates(llx, lly, urx, ury)

Parameters:
* **llx** – a number, x-coordinate of lower left corner of
canvas

* **lly** – a number, y-coordinate of lower left corner of
canvas

* **urx** – a number, x-coordinate of upper right corner of
canvas

* **ury** – a number, y-coordinate of upper right corner of
canvas

Set up user-defined coordinate system and switch to mode “world” if
necessary. This performs a "screen.reset()". If mode “world” is
already active, all drawings are redrawn according to the new
coordinates.

**ATTENTION**: in user-defined coordinate systems angles may appear
distorted.

>>> screen.reset()
>>> screen.setworldcoordinates(-50,-7.5,50,7.5)
>>> for _ in range(72):
... left(10)
...
>>> for _ in range(8):
... left(45); fd(2) # a regular octagon

Animation control
-----------------

turtle.delay(delay=None)

Parameters:
**delay** – positive integer

Set or return the drawing *delay* in milliseconds. (This is
approximately the time interval between two consecutive canvas
updates.) The longer the drawing delay, the slower the animation.

Optional argument:

>>> screen.delay()
10
>>> screen.delay(5)
>>> screen.delay()
5

turtle.tracer(n=None, delay=None)

Parameters:
* **n** – nonnegative integer

* **delay** – nonnegative integer

Turn turtle animation on/off and set delay for update drawings. If
*n* is given, only each n-th regular screen update is really
performed. (Can be used to accelerate the drawing of complex
graphics.) When called without arguments, returns the currently
stored value of n. Second argument sets delay value (see
"delay()").

>>> screen.tracer(8, 25)
>>> dist = 2
>>> for i in range(200):
... fd(dist)
... rt(90)
... dist += 2

turtle.update()

Perform a TurtleScreen update. To be used when tracer is turned
off.

See also the RawTurtle/Turtle method "speed()".

Using screen events
-------------------

turtle.listen(xdummy=None, ydummy=None)

Set focus on TurtleScreen (in order to collect key-events). Dummy
arguments are provided in order to be able to pass "listen()" to
the onclick method.

turtle.onkey(fun, key)
turtle.onkeyrelease(fun, key)

Parameters:
* **fun** – a function with no arguments or "None"

* **key** – a string: key (e.g. “a”) or key-symbol (e.g.
“space”)

Bind *fun* to key-release event of key. If *fun* is "None", event
bindings are removed. Remark: in order to be able to register key-
events, TurtleScreen must have the focus. (See method "listen()".)

>>> def f():
... fd(50)
... lt(60)
...
>>> screen.onkey(f, "Up")
>>> screen.listen()

turtle.onkeypress(fun, key=None)

Parameters:
* **fun** – a function with no arguments or "None"

* **key** – a string: key (e.g. “a”) or key-symbol (e.g.
“space”)

Bind *fun* to key-press event of key if key is given, or to any
key-press-event if no key is given. Remark: in order to be able to
register key-events, TurtleScreen must have focus. (See method
"listen()".)

>>> def f():
... fd(50)
...
>>> screen.onkey(f, "Up")
>>> screen.listen()

turtle.onclick(fun, btn=1, add=None)
turtle.onscreenclick(fun, btn=1, add=None)

Parameters:
* **fun** – a function with two arguments which will be called
with the coordinates of the clicked point on the canvas

* **num** – number of the mouse-button, defaults to 1 (left
mouse button)

* **add** – "True" or "False" – if "True", a new binding will
be added, otherwise it will replace a former binding

Bind *fun* to mouse-click events on this screen. If *fun* is
"None", existing bindings are removed.

Example for a TurtleScreen instance named "screen" and a Turtle
instance named turtle:

>>> screen.onclick(turtle.goto) # Subsequently clicking into the TurtleScreen will
>>> # make the turtle move to the clicked point.
>>> screen.onclick(None) # remove event binding again

Note: This TurtleScreen method is available as a global function
only under the name "onscreenclick". The global function
"onclick" is another one derived from the Turtle method
"onclick".

turtle.ontimer(fun, t=0)

Parameters:
* **fun** – a function with no arguments

* **t** – a number >= 0

Install a timer that calls *fun* after *t* milliseconds.

>>> running = True
>>> def f():
... if running:
... fd(50)
... lt(60)
... screen.ontimer(f, 250)
>>> f() ### makes the turtle march around
>>> running = False

turtle.mainloop()
turtle.done()

Starts event loop - calling Tkinter’s mainloop function. Must be
the last statement in a turtle graphics program. Must *not* be used
if a script is run from within IDLE in -n mode (No subprocess) -
for interactive use of turtle graphics.

>>> screen.mainloop()

Input methods
-------------

turtle.textinput(title, prompt)

Parameters:
* **title** – string

* **prompt** – string

Pop up a dialog window for input of a string. Parameter title is
the title of the dialog window, prompt is a text mostly describing
what information to input. Return the string input. If the dialog
is canceled, return "None".

>>> screen.textinput("NIM", "Name of first player:")

turtle.numinput(title, prompt, default=None, minval=None, maxval=None)

Parameters:
* **title** – string

* **prompt** – string

* **default** – number (optional)

* **minval** – number (optional)

* **maxval** – number (optional)

Pop up a dialog window for input of a number. title is the title of
the dialog window, prompt is a text mostly describing what
numerical information to input. default: default value, minval:
minimum value for input, maxval: maximum value for input The number
input must be in the range minval .. maxval if these are given. If
not, a hint is issued and the dialog remains open for correction.
Return the number input. If the dialog is canceled, return "None".

>>> screen.numinput("Poker", "Your stakes:", 1000, minval=10, maxval=10000)

Settings and special methods
----------------------------

turtle.mode(mode=None)

Parameters:
**mode** – one of the strings “standard”, “logo” or “world”

Set turtle mode (“standard”, “logo” or “world”) and perform reset.
If mode is not given, current mode is returned.

Mode “standard” is compatible with old "turtle". Mode “logo” is
compatible with most Logo turtle graphics. Mode “world” uses user-
defined “world coordinates”. **Attention**: in this mode angles
appear distorted if "x/y" unit-ratio doesn’t equal 1.

>>> mode("logo") # resets turtle heading to north
>>> mode()
'logo'

turtle.colormode(cmode=None)

Parameters:
**cmode** – one of the values 1.0 or 255

Return the colormode or set it to 1.0 or 255. Subsequently *r*,
*g*, *b* values of color triples have to be in the range
0..*cmode*.

>>> screen.colormode(1)
>>> turtle.pencolor(240, 160, 80)
Traceback (most recent call last):
...
TurtleGraphicsError: bad color sequence: (240, 160, 80)
>>> screen.colormode()
1.0
>>> screen.colormode(255)
>>> screen.colormode()
255
>>> turtle.pencolor(240,160,80)

turtle.getcanvas()

Return the Canvas of this TurtleScreen. Useful for insiders who
know what to do with a Tkinter Canvas.

>>> cv = screen.getcanvas()
>>> cv
<turtle.ScrolledCanvas object ...>

turtle.getshapes()

Return a list of names of all currently available turtle shapes.

>>> screen.getshapes()
['arrow', 'blank', 'circle', ..., 'turtle']

turtle.register_shape(name, shape=None)
turtle.addshape(name, shape=None)

There are three different ways to call this function:

1. *name* is the name of a gif-file and *shape* is "None":
Install the corresponding image shape.

>>> screen.register_shape("turtle.gif")

Note: Image shapes *do not* rotate when turning the turtle, so
they do not display the heading of the turtle!

2. *name* is an arbitrary string and *shape* is a tuple of pairs
of coordinates: Install the corresponding polygon shape.

>>> screen.register_shape("triangle", ((5,-3), (0,5), (-5,-3)))

3. *name* is an arbitrary string and shape is a (compound)
"Shape" object: Install the corresponding compound shape.

Add a turtle shape to TurtleScreen’s shapelist. Only thusly
registered shapes can be used by issuing the command
"shape(shapename)".

turtle.turtles()

Return the list of turtles on the screen.

>>> for turtle in screen.turtles():
... turtle.color("red")

turtle.window_height()

Return the height of the turtle window.

>>> screen.window_height()
480

turtle.window_width()

Return the width of the turtle window.

>>> screen.window_width()
640

Methods specific to Screen, not inherited from TurtleScreen
-----------------------------------------------------------

turtle.bye()

Shut the turtlegraphics window.

turtle.exitonclick()

Bind bye() method to mouse clicks on the Screen.

If the value “using_IDLE” in the configuration dictionary is
"False" (default value), also enter mainloop. Remark: If IDLE with
the "-n" switch (no subprocess) is used, this value should be set
to "True" in "turtle.cfg". In this case IDLE’s own mainloop is
active also for the client script.

turtle.setup(width=_CFG["width"], height=_CFG["height"], startx=_CFG["leftright"], starty=_CFG["topbottom"])

Set the size and position of the main window. Default values of
arguments are stored in the configuration dictionary and can be
changed via a "turtle.cfg" file.

Parameters:
* **width** – if an integer, a size in pixels, if a float, a
fraction of the screen; default is 50% of screen

* **height** – if an integer, the height in pixels, if a
float, a fraction of the screen; default is 75% of screen

* **startx** – if positive, starting position in pixels from
the left edge of the screen, if negative from the right edge,
if "None", center window horizontally

* **starty** – if positive, starting position in pixels from
the top edge of the screen, if negative from the bottom edge,
if "None", center window vertically

>>> screen.setup (width=200, height=200, startx=0, starty=0)
>>> # sets window to 200x200 pixels, in upper left of screen
>>> screen.setup(width=.75, height=0.5, startx=None, starty=None)
>>> # sets window to 75% of screen by 50% of screen and centers

turtle.title(titlestring)

Parameters:
**titlestring** – a string that is shown in the titlebar of the
turtle graphics window

Set title of turtle window to *titlestring*.

>>> screen.title("Welcome to the turtle zoo!")

Public classes
==============

class turtle.RawTurtle(canvas)
class turtle.RawPen(canvas)

Parameters:
**canvas** – a "tkinter.Canvas", a "ScrolledCanvas" or a
"TurtleScreen"

Create a turtle. The turtle has all methods described above as
“methods of Turtle/RawTurtle”.

class turtle.Turtle

Subclass of RawTurtle, has the same interface but draws on a
default "Screen" object created automatically when needed for the
first time.

class turtle.TurtleScreen(cv)

Parameters:
**cv** – a "tkinter.Canvas"

Provides screen oriented methods like "setbg()" etc. that are
described above.

class turtle.Screen

Subclass of TurtleScreen, with four methods added.

class turtle.ScrolledCanvas(master)

Parameters:
**master** – some Tkinter widget to contain the ScrolledCanvas,
i.e. a Tkinter-canvas with scrollbars added

Used by class Screen, which thus automatically provides a
ScrolledCanvas as playground for the turtles.

class turtle.Shape(type_, data)

Parameters:
**type_** – one of the strings “polygon”, “image”, “compound”

Data structure modeling shapes. The pair "(type_, data)" must
follow this specification:

+-------------+------------------------------------------------------------+
| *type_* | *data* |
+=============+============================================================+
| “polygon” | a polygon-tuple, i.e. a tuple of pairs of coordinates |
+-------------+------------------------------------------------------------+
| “image” | an image (in this form only used internally!) |
+-------------+------------------------------------------------------------+
| “compound” | "None" (a compound shape has to be constructed using the |
| | "addcomponent()" method) |
+-------------+------------------------------------------------------------+

addcomponent(poly, fill, outline=None)

Parameters:
* **poly** – a polygon, i.e. a tuple of pairs of numbers

* **fill** – a color the *poly* will be filled with

* **outline** – a color for the poly’s outline (if given)

Example:

>>> poly = ((0,0),(10,-5),(0,10),(-10,-5))
>>> s = Shape("compound")
>>> s.addcomponent(poly, "red", "blue")
>>> # ... add more components and then use register_shape()

See Compound shapes.

class turtle.Vec2D(x, y)

A two-dimensional vector class, used as a helper class for
implementing turtle graphics. May be useful for turtle graphics
programs too. Derived from tuple, so a vector is a tuple!

Provides (for *a*, *b* vectors, *k* number):

* "a + b" vector addition

* "a - b" vector subtraction

* "a * b" inner product

* "k * a" and "a * k" multiplication with scalar

* "abs(a)" absolute value of a

* "a.rotate(angle)" rotation

Help and configuration
======================

How to use help
---------------

The public methods of the Screen and Turtle classes are documented
extensively via docstrings. So these can be used as online-help via
the Python help facilities:

* When using IDLE, tooltips show the signatures and first lines of
the docstrings of typed in function-/method calls.

* Calling "help()" on methods or functions displays the docstrings:

>>> help(Screen.bgcolor)
Help on method bgcolor in module turtle:

bgcolor(self, *args) unbound turtle.Screen method
Set or return backgroundcolor of the TurtleScreen.

Arguments (if given): a color string or three numbers
in the range 0..colormode or a 3-tuple of such numbers.

>>> screen.bgcolor("orange")
>>> screen.bgcolor()
"orange"
>>> screen.bgcolor(0.5,0,0.5)
>>> screen.bgcolor()
"#800080"

>>> help(Turtle.penup)
Help on method penup in module turtle:

penup(self) unbound turtle.Turtle method
Pull the pen up -- no drawing when moving.

Aliases: penup | pu | up

No argument

>>> turtle.penup()

* The docstrings of the functions which are derived from methods
have a modified form:

>>> help(bgcolor)
Help on function bgcolor in module turtle:

bgcolor(*args)
Set or return backgroundcolor of the TurtleScreen.

Arguments (if given): a color string or three numbers
in the range 0..colormode or a 3-tuple of such numbers.

Example::

>>> bgcolor("orange")
>>> bgcolor()
"orange"
>>> bgcolor(0.5,0,0.5)
>>> bgcolor()
"#800080"

>>> help(penup)
Help on function penup in module turtle:

penup()
Pull the pen up -- no drawing when moving.

Aliases: penup | pu | up

No argument

Example:
>>> penup()

These modified docstrings are created automatically together with the
function definitions that are derived from the methods at import time.

Translation of docstrings into different languages
--------------------------------------------------

There is a utility to create a dictionary the keys of which are the
method names and the values of which are the docstrings of the public
methods of the classes Screen and Turtle.

turtle.write_docstringdict(filename="turtle_docstringdict")

Parameters:
**filename** – a string, used as filename

Create and write docstring-dictionary to a Python script with the
given filename. This function has to be called explicitly (it is
not used by the turtle graphics classes). The docstring dictionary
will be written to the Python script "*filename*.py". It is
intended to serve as a template for translation of the docstrings
into different languages.

If you (or your students) want to use "turtle" with online help in
your native language, you have to translate the docstrings and save
the resulting file as e.g. "turtle_docstringdict_german.py".

If you have an appropriate entry in your "turtle.cfg" file this
dictionary will be read in at import time and will replace the
original English docstrings.

At the time of this writing there are docstring dictionaries in German
and in Italian. (Requests please to glingl@aon.at.)

How to configure Screen and Turtles
-----------------------------------

The built-in default configuration mimics the appearance and behaviour
of the old turtle module in order to retain best possible
compatibility with it.

If you want to use a different configuration which better reflects the
features of this module or which better fits to your needs, e.g. for
use in a classroom, you can prepare a configuration file "turtle.cfg"
which will be read at import time and modify the configuration
according to its settings.

The built in configuration would correspond to the following
turtle.cfg:

width = 0.5
height = 0.75
leftright = None
topbottom = None
canvwidth = 400
canvheight = 300
mode = standard
colormode = 1.0
delay = 10
undobuffersize = 1000
shape = classic
pencolor = black
fillcolor = black
resizemode = noresize
visible = True
language = english
exampleturtle = turtle
examplescreen = screen
title = Python Turtle Graphics
using_IDLE = False

Short explanation of selected entries:

* The first four lines correspond to the arguments of the
"Screen.setup()" method.

* Line 5 and 6 correspond to the arguments of the method
"Screen.screensize()".

* *shape* can be any of the built-in shapes, e.g: arrow, turtle,
etc. For more info try "help(shape)".

* If you want to use no fillcolor (i.e. make the turtle
transparent), you have to write "fillcolor = """ (but all nonempty
strings must not have quotes in the cfg-file).

* If you want to reflect the turtle its state, you have to use
"resizemode = auto".

* If you set e.g. "language = italian" the docstringdict
"turtle_docstringdict_italian.py" will be loaded at import time (if
present on the import path, e.g. in the same directory as "turtle".

* The entries *exampleturtle* and *examplescreen* define the names
of these objects as they occur in the docstrings. The
transformation of method-docstrings to function-docstrings will
delete these names from the docstrings.

* *using_IDLE*: Set this to "True" if you regularly work with IDLE
and its -n switch (“no subprocess”). This will prevent
"exitonclick()" to enter the mainloop.

There can be a "turtle.cfg" file in the directory where "turtle" is
stored and an additional one in the current working directory. The
latter will override the settings of the first one.

The "Lib/turtledemo" directory contains a "turtle.cfg" file. You can
study it as an example and see its effects when running the demos
(preferably not from within the demo-viewer).

"turtledemo" — Demo scripts
===========================

The "turtledemo" package includes a set of demo scripts. These
scripts can be run and viewed using the supplied demo viewer as
follows:

python -m turtledemo

Alternatively, you can run the demo scripts individually. For
example,

python -m turtledemo.bytedesign

The "turtledemo" package directory contains:

* A demo viewer "__main__.py" which can be used to view the
sourcecode of the scripts and run them at the same time.

* Multiple scripts demonstrating different features of the "turtle"
module. Examples can be accessed via the Examples menu. They can
also be run standalone.

* A "turtle.cfg" file which serves as an example of how to write and
use such files.

The demo scripts are:

Have fun!

Changes since Python 2.6
========================

* The methods "Turtle.tracer()", "Turtle.window_width()" and
"Turtle.window_height()" have been eliminated. Methods with these
names and functionality are now available only as methods of
"Screen". The functions derived from these remain available. (In
fact already in Python 2.6 these methods were merely duplications of
the corresponding "TurtleScreen"/"Screen"-methods.)

* The method "Turtle.fill()" has been eliminated. The behaviour of
"begin_fill()" and "end_fill()" have changed slightly: now every
filling-process must be completed with an "end_fill()" call.

* A method "Turtle.filling()" has been added. It returns a boolean
value: "True" if a filling process is under way, "False" otherwise.
This behaviour corresponds to a "fill()" call without arguments in
Python 2.6.

Changes since Python 3.0
========================

* The methods "Turtle.shearfactor()", "Turtle.shapetransform()" and
"Turtle.get_shapepoly()" have been added. Thus the full range of
regular linear transforms is now available for transforming turtle
shapes. "Turtle.tiltangle()" has been enhanced in functionality: it
now can be used to get or set the tiltangle. "Turtle.settiltangle()"
has been deprecated.

* The method "Screen.onkeypress()" has been added as a complement to
"Screen.onkey()" which in fact binds actions to the keyrelease
event. Accordingly the latter has got an alias:
"Screen.onkeyrelease()".

* The method "Screen.mainloop()" has been added. So when working
only with Screen and Turtle objects one must not additionally import
"mainloop()" anymore.

* Two input methods has been added "Screen.textinput()" and
"Screen.numinput()". These popup input dialogs and return strings
and numbers respectively.

* Two example scripts "tdemo_nim.py" and "tdemo_round_dance.py" have
been added to the "Lib/turtledemo" directory.

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