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Python 3.6.5 Documentation > "zlib" — Compression compatible with **gzip**

"zlib" — Compression compatible with **gzip**
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For applications that require data compression, the functions in this
module allow compression and decompression, using the zlib library.
The zlib library has its own home page at http://www.zlib.net. There
are known incompatibilities between the Python module and versions of
the zlib library earlier than 1.1.3; 1.1.3 has a security
vulnerability, so we recommend using 1.1.4 or later.

zlib’s functions have many options and often need to be used in a
particular order. This documentation doesn’t attempt to cover all of
the permutations; consult the zlib manual at
http://www.zlib.net/manual.html for authoritative information.

For reading and writing ".gz" files see the "gzip" module.

The available exception and functions in this module are:

exception zlib.error

Exception raised on compression and decompression errors.

zlib.adler32(data[, value])

Computes an Adler-32 checksum of *data*. (An Adler-32 checksum is
almost as reliable as a CRC32 but can be computed much more
quickly.) The result is an unsigned 32-bit integer. If *value* is
present, it is used as the starting value of the checksum;
otherwise, a default value of 1 is used. Passing in *value* allows
computing a running checksum over the concatenation of several
inputs. The algorithm is not cryptographically strong, and should
not be used for authentication or digital signatures. Since the
algorithm is designed for use as a checksum algorithm, it is not
suitable for use as a general hash algorithm.

Changed in version 3.0: Always returns an unsigned value. To
generate the same numeric value across all Python versions and
platforms, use "adler32(data) & 0xffffffff".

zlib.compress(data, level=-1)

Compresses the bytes in *data*, returning a bytes object containing
compressed data. *level* is an integer from "0" to "9" or "-1"
controlling the level of compression; "1" (Z_BEST_SPEED) is fastest
and produces the least compression, "9" (Z_BEST_COMPRESSION) is
slowest and produces the most. "0" (Z_NO_COMPRESSION) is no
compression. The default value is "-1" (Z_DEFAULT_COMPRESSION).
Z_DEFAULT_COMPRESSION represents a default compromise between speed
and compression (currently equivalent to level 6). Raises the
"error" exception if any error occurs.

Changed in version 3.6: *level* can now be used as a keyword
parameter.

zlib.compressobj(level=-1, method=DEFLATED, wbits=MAX_WBITS, memLevel=DEF_MEM_LEVEL, strategy=Z_DEFAULT_STRATEGY[, zdict])

Returns a compression object, to be used for compressing data
streams that won’t fit into memory at once.

*level* is the compression level – an integer from "0" to "9" or
"-1". A value of "1" (Z_BEST_SPEED) is fastest and produces the
least compression, while a value of "9" (Z_BEST_COMPRESSION) is
slowest and produces the most. "0" (Z_NO_COMPRESSION) is no
compression. The default value is "-1" (Z_DEFAULT_COMPRESSION).
Z_DEFAULT_COMPRESSION represents a default compromise between speed
and compression (currently equivalent to level 6).

*method* is the compression algorithm. Currently, the only
supported value is "DEFLATED".

The *wbits* argument controls the size of the history buffer (or
the “window size”) used when compressing data, and whether a header
and trailer is included in the output. It can take several ranges
of values, defaulting to "15" (MAX_WBITS):

* +9 to +15: The base-two logarithm of the window size, which
therefore ranges between 512 and 32768. Larger values produce
better compression at the expense of greater memory usage. The
resulting output will include a zlib-specific header and trailer.

* −9 to −15: Uses the absolute value of *wbits* as the window
size logarithm, while producing a raw output stream with no
header or trailing checksum.

* +25 to +31 = 16 + (9 to 15): Uses the low 4 bits of the value
as the window size logarithm, while including a basic **gzip**
header and trailing checksum in the output.

The *memLevel* argument controls the amount of memory used for the
internal compression state. Valid values range from "1" to "9".
Higher values use more memory, but are faster and produce smaller
output.

*strategy* is used to tune the compression algorithm. Possible
values are "Z_DEFAULT_STRATEGY", "Z_FILTERED", "Z_HUFFMAN_ONLY",
"Z_RLE" (zlib 1.2.0.1) and "Z_FIXED" (zlib 1.2.2.2).

*zdict* is a predefined compression dictionary. This is a sequence
of bytes (such as a "bytes" object) containing subsequences that
are expected to occur frequently in the data that is to be
compressed. Those subsequences that are expected to be most common
should come at the end of the dictionary.

Changed in version 3.3: Added the *zdict* parameter and keyword
argument support.

zlib.crc32(data[, value])

Computes a CRC (Cyclic Redundancy Check) checksum of *data*. The
result is an unsigned 32-bit integer. If *value* is present, it is
used as the starting value of the checksum; otherwise, a default
value of 0 is used. Passing in *value* allows computing a running
checksum over the concatenation of several inputs. The algorithm
is not cryptographically strong, and should not be used for
authentication or digital signatures. Since the algorithm is
designed for use as a checksum algorithm, it is not suitable for
use as a general hash algorithm.

Changed in version 3.0: Always returns an unsigned value. To
generate the same numeric value across all Python versions and
platforms, use "crc32(data) & 0xffffffff".

zlib.decompress(data, wbits=MAX_WBITS, bufsize=DEF_BUF_SIZE)

Decompresses the bytes in *data*, returning a bytes object
containing the uncompressed data. The *wbits* parameter depends on
the format of *data*, and is discussed further below. If *bufsize*
is given, it is used as the initial size of the output buffer.
Raises the "error" exception if any error occurs.

The *wbits* parameter controls the size of the history buffer (or
“window size”), and what header and trailer format is expected. It
is similar to the parameter for "compressobj()", but accepts more
ranges of values:

* +8 to +15: The base-two logarithm of the window size. The
input must include a zlib header and trailer.

* 0: Automatically determine the window size from the zlib
header. Only supported since zlib 1.2.3.5.

* −8 to −15: Uses the absolute value of *wbits* as the window
size logarithm. The input must be a raw stream with no header or
trailer.

* +24 to +31 = 16 + (8 to 15): Uses the low 4 bits of the value
as the window size logarithm. The input must include a gzip
header and trailer.

* +40 to +47 = 32 + (8 to 15): Uses the low 4 bits of the value
as the window size logarithm, and automatically accepts either
the zlib or gzip format.

When decompressing a stream, the window size must not be smaller
than the size originally used to compress the stream; using a too-
small value may result in an "error" exception. The default *wbits*
value corresponds to the largest window size and requires a zlib
header and trailer to be included.

*bufsize* is the initial size of the buffer used to hold
decompressed data. If more space is required, the buffer size will
be increased as needed, so you don’t have to get this value exactly
right; tuning it will only save a few calls to "malloc()".

Changed in version 3.6: *wbits* and *bufsize* can be used as
keyword arguments.

zlib.decompressobj(wbits=MAX_WBITS[, zdict])

Returns a decompression object, to be used for decompressing data
streams that won’t fit into memory at once.

The *wbits* parameter controls the size of the history buffer (or
the “window size”), and what header and trailer format is expected.
It has the same meaning as described for decompress().

The *zdict* parameter specifies a predefined compression
dictionary. If provided, this must be the same dictionary as was
used by the compressor that produced the data that is to be
decompressed.

Note: If *zdict* is a mutable object (such as a "bytearray"), you
must not modify its contents between the call to
"decompressobj()" and the first call to the decompressor’s
"decompress()" method.

Changed in version 3.3: Added the *zdict* parameter.

Compression objects support the following methods:

Compress.compress(data)

Compress *data*, returning a bytes object containing compressed
data for at least part of the data in *data*. This data should be
concatenated to the output produced by any preceding calls to the
"compress()" method. Some input may be kept in internal buffers
for later processing.

Compress.flush([mode])

All pending input is processed, and a bytes object containing the
remaining compressed output is returned. *mode* can be selected
from the constants "Z_NO_FLUSH", "Z_PARTIAL_FLUSH", "Z_SYNC_FLUSH",
"Z_FULL_FLUSH", "Z_BLOCK" (zlib 1.2.3.4), or "Z_FINISH", defaulting
to "Z_FINISH". Except "Z_FINISH", all constants allow compressing
further bytestrings of data, while "Z_FINISH" finishes the
compressed stream and prevents compressing any more data. After
calling "flush()" with *mode* set to "Z_FINISH", the "compress()"
method cannot be called again; the only realistic action is to
delete the object.

Compress.copy()

Returns a copy of the compression object. This can be used to
efficiently compress a set of data that share a common initial
prefix.

Decompression objects support the following methods and attributes:

Decompress.unused_data

A bytes object which contains any bytes past the end of the
compressed data. That is, this remains "b""" until the last byte
that contains compression data is available. If the whole
bytestring turned out to contain compressed data, this is "b""", an
empty bytes object.

Decompress.unconsumed_tail

A bytes object that contains any data that was not consumed by the
last "decompress()" call because it exceeded the limit for the
uncompressed data buffer. This data has not yet been seen by the
zlib machinery, so you must feed it (possibly with further data
concatenated to it) back to a subsequent "decompress()" method call
in order to get correct output.

Decompress.eof

A boolean indicating whether the end of the compressed data stream
has been reached.

This makes it possible to distinguish between a properly-formed
compressed stream, and an incomplete or truncated one.

New in version 3.3.

Decompress.decompress(data, max_length=0)

Decompress *data*, returning a bytes object containing the
uncompressed data corresponding to at least part of the data in
*string*. This data should be concatenated to the output produced
by any preceding calls to the "decompress()" method. Some of the
input data may be preserved in internal buffers for later
processing.

If the optional parameter *max_length* is non-zero then the return
value will be no longer than *max_length*. This may mean that not
all of the compressed input can be processed; and unconsumed data
will be stored in the attribute "unconsumed_tail". This bytestring
must be passed to a subsequent call to "decompress()" if
decompression is to continue. If *max_length* is zero then the
whole input is decompressed, and "unconsumed_tail" is empty.

Changed in version 3.6: *max_length* can be used as a keyword
argument.

Decompress.flush([length])

All pending input is processed, and a bytes object containing the
remaining uncompressed output is returned. After calling
"flush()", the "decompress()" method cannot be called again; the
only realistic action is to delete the object.

The optional parameter *length* sets the initial size of the output
buffer.

Decompress.copy()

Returns a copy of the decompression object. This can be used to
save the state of the decompressor midway through the data stream
in order to speed up random seeks into the stream at a future
point.

Information about the version of the zlib library in use is available
through the following constants:

zlib.ZLIB_VERSION

The version string of the zlib library that was used for building
the module. This may be different from the zlib library actually
used at runtime, which is available as "ZLIB_RUNTIME_VERSION".

zlib.ZLIB_RUNTIME_VERSION

The version string of the zlib library actually loaded by the
interpreter.

New in version 3.3.