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125 lines
3.8 KiB
125 lines
3.8 KiB
Metadata-Version: 2.1
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Name: cloudpickle
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Version: 0.8.0
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Summary: Extended pickling support for Python objects
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Home-page: https://github.com/cloudpipe/cloudpickle
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Author: Cloudpipe
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Author-email: cloudpipe@googlegroups.com
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License: BSD 3-Clause License
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Platform: UNKNOWN
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Classifier: Development Status :: 4 - Beta
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Classifier: Intended Audience :: Developers
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Classifier: License :: OSI Approved :: BSD License
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Classifier: Operating System :: POSIX
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Classifier: Operating System :: Microsoft :: Windows
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Classifier: Operating System :: MacOS :: MacOS X
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Classifier: Programming Language :: Python :: 2.7
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Classifier: Programming Language :: Python :: 3.5
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Classifier: Programming Language :: Python :: 3.6
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Classifier: Programming Language :: Python :: 3.7
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Classifier: Programming Language :: Python :: Implementation :: CPython
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Classifier: Programming Language :: Python :: Implementation :: PyPy
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Classifier: Topic :: Software Development :: Libraries :: Python Modules
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Classifier: Topic :: Scientific/Engineering
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Classifier: Topic :: System :: Distributed Computing
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# cloudpickle
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[](https://travis-ci.org/cloudpipe/cloudpickle)
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[](https://codecov.io/github/cloudpipe/cloudpickle?branch=master)
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`cloudpickle` makes it possible to serialize Python constructs not supported
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by the default `pickle` module from the Python standard library.
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`cloudpickle` is especially useful for **cluster computing** where Python
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code is shipped over the network to execute on remote hosts, possibly close
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to the data.
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Among other things, `cloudpickle` supports pickling for **lambda functions**
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along with **functions and classes defined interactively** in the
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`__main__` module (for instance in a script, a shell or a Jupyter notebook).
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**`cloudpickle` uses `pickle.HIGHEST_PROTOCOL` by default**: it is meant to
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send objects between processes running the **same version of Python**.
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Using `cloudpickle` for **long-term object storage is not supported and
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discouraged.**
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Installation
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------------
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The latest release of `cloudpickle` is available from
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[pypi](https://pypi.python.org/pypi/cloudpickle):
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pip install cloudpickle
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Examples
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--------
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Pickling a lambda expression:
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```python
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>>> import cloudpickle
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>>> squared = lambda x: x ** 2
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>>> pickled_lambda = cloudpickle.dumps(squared)
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>>> import pickle
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>>> new_squared = pickle.loads(pickled_lambda)
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>>> new_squared(2)
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4
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```
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Pickling a function interactively defined in a Python shell session
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(in the `__main__` module):
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```python
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>>> CONSTANT = 42
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>>> def my_function(data):
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... return data + CONSTANT
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...
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>>> pickled_function = cloudpickle.dumps(my_function)
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>>> pickle.loads(pickled_function)(43)
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85
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```
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Running the tests
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-----------------
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- With `tox`, to test run the tests for all the supported versions of
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Python and PyPy:
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pip install tox
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tox
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or alternatively for a specific environment:
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tox -e py37
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- With `py.test` to only run the tests for your current version of
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Python:
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pip install -r dev-requirements.txt
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PYTHONPATH='.:tests' py.test
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History
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-------
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`cloudpickle` was initially developed by [picloud.com](http://web.archive.org/web/20140721022102/http://blog.picloud.com/2013/11/17/picloud-has-joined-dropbox/) and shipped as part of
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the client SDK.
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A copy of `cloudpickle.py` was included as part of PySpark, the Python
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interface to [Apache Spark](https://spark.apache.org/). Davies Liu, Josh
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Rosen, Thom Neale and other Apache Spark developers improved it significantly,
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most notably to add support for PyPy and Python 3.
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The aim of the `cloudpickle` project is to make that work available to a wider
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audience outside of the Spark ecosystem and to make it easier to improve it
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further notably with the help of a dedicated non-regression test suite.
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