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python-snappy

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资源说明：Python bindings for the snappy google library

python-snappy
=============

Python library for the snappy compression library from Google.
This library is distributed under the New BSD License
(http://www.opensource.org/licenses/bsd-license.php).

Dependencies
============

* snappy library >= 1.0.2 (or revision 27)
  https://github.com/google/snappy

  You can install Snappy C library with following commands:

  - APT:  :code:`sudo apt-get install libsnappy-dev`
  - RPM:  :code:`sudo yum install snappy-devel`
  - Brew: :code:`brew install snappy`

To use with pypy:

* cffi >= 1.15.0
  http://cffi.readthedocs.org/

* Supports Python 2.7 and Python 3

Build & Install
===============

Build:

::

  python setup.py build

Install:

::

  python setup.py install


Or install it from PyPi:

::

  pip install python-snappy

Run tests
=========

::

  # run python snappy tests
  nosetest test_snappy.py

  # support for cffi backend
  nosetest test_snappy_cffi.py

Benchmarks
==========

*snappy vs. zlib*

**Compressing:**

::

  %timeit zlib.compress("hola mundo cruel!")
  100000 loops, best of 3: 9.64 us per loop

  %timeit snappy.compress("hola mundo cruel!")
  1000000 loops, best of 3: 849 ns per loop

**Snappy** is **11 times faster** than zlib when compressing

**Uncompressing:**

::

  r = snappy.compress("hola mundo cruel!")

  %timeit snappy.uncompress(r)
  1000000 loops, best of 3: 755 ns per loop

  r = zlib.compress("hola mundo cruel!")

  %timeit zlib.decompress(r)
  1000000 loops, best of 3: 1.11 us per loop

**Snappy** is **twice** as fast as zlib

Commandline usage
=================

You can invoke Python Snappy to compress or decompress files or streams from
the commandline after installation as follows

Compressing and decompressing a file:

::

  $ python -m snappy -c uncompressed_file compressed_file.snappy
  $ python -m snappy -d compressed_file.snappy uncompressed_file

Compressing and decompressing a stream:

::

  $ cat uncompressed_data | python -m snappy -c > compressed_data.snappy
  $ cat compressed_data.snappy | python -m snappy -d > uncompressed_data

You can get help by running

::

  $ python -m snappy --help


Snappy - compression library from Google (c)
 http://google.github.io/snappy
 
Frequently Asked Questions
==========================
 
**How to install it on Mac OS X?**

It has been reported a few times (Issue #7 and #23) that it can't be installed correctly the library in Mac. 
The procedure should be,

::

    $ brew install snappy # snappy library from Google 
    $ CPPFLAGS="-I/usr/local/include -L/usr/local/lib" pip install python-snappy

Try this command if libstdc++ is deprecated

::
  
    $ CPPFLAGS="-I/usr/local/include -L/usr/local/lib -stdlib=libc++ " pip install python-snappy
    

Or this command in Apple Silicon:

::
  
    $ CPPFLAGS="-I/opt/homebrew/include -L/opt/homebrew/lib" pip install python-snappy

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