============
AST Unparser
============
.. image:: https://badge.fury.io/py/astunparse.png
:target: http://badge.fury.io/py/astunparse
.. image:: https://travis-ci.org/simonpercivall/astunparse.png?branch=master
:target: https://travis-ci.org/simonpercivall/astunparse
.. image:: https://readthedocs.org/projects/astunparse/badge/
:target: https://astunparse.readthedocs.org/
An AST unparser for Python.
This is a factored out version of ``unparse`` found in the Python
source distribution; under Demo/parser in Python 2 and under Tools/parser
in Python 3.
Basic example::
import inspect
import ast
import astunparse
# get back the source code
astunparse.unparse(ast.parse(inspect.getsource(ast)))
# get a pretty-printed dump of the AST
astunparse.dump(ast.parse(inspect.getsource(ast)))
This library is single-source compatible with Python 2.6 through Python 3.5. It
is authored by the Python core developers; I have simply merged the Python 2.7
and the Python 3.5 source and test suites, and added a wrapper. This factoring
out is to provide a library implementation that supports both versions.
Added to this is a pretty-printing ``dump`` utility function.
The test suite both runs specific tests and also roundtrips much of the
standard library.
Extensions and Alternatives
---------------------------
Similar projects include:
* codegen_
* astor_
* astmonkey_
* astprint_
None of these roundtrip much of the standard library and fail several of the basic
tests in the ``test_unparse`` test suite.
This library uses mature and core maintained code instead of trying to patch
existing libraries. The ``unparse`` and the ``test_unparse`` modules
are under the PSF license.
Extensions include:
* typed-astunparse: extends astunparse to support type annotations.
* Documentation: http://astunparse.rtfd.org.
Features
--------
* unparses Python AST.
* pretty-prints AST.
.. _codegen: https://github.com/andreif/codegen
.. _astor: https://github.com/berkerpeksag/astor
.. _astmonkey: https://github.com/konradhalas/astmonkey
.. _astprint: https://github.com/Manticore/astprint
Changelog
=========
Here's the recent changes to AST Unparser.
1.6.3 - 2019-12-22
~~~~~~~~~~~~~~~~~~
* Add full support for Python 3.8
1.6.2 - 2019-01-19
~~~~~~~~~~~~~~~~~~
* Add support for the Constant node in Python 3.8
* Add tests to the sdist
1.6.1 - 2018-10-03
~~~~~~~~~~~~~~~~~~
* Fix the roundtripping of very complex f-strings.
1.6.0 - 2018-09-30
~~~~~~~~~~~~~~~~~~
* Python 3.7 compatibility
1.5.0 - 2017-02-05
~~~~~~~~~~~~~~~~~~
* Python 3.6 compatibility
* bugfix: correct argparser option type
1.4.0 - 2016-06-24
~~~~~~~~~~~~~~~~~~
* Support for the ``async`` keyword
* Support for unparsing "Interactive" and "Expression" nodes
1.3.0 - 2016-01-17
~~~~~~~~~~~~~~~~~~
* Python 3.5 compatibility
1.2.0 - 2014-04-03
~~~~~~~~~~~~~~~~~~
* Python 2.6 through 3.4 compatibility
* A new function ``dump`` is added to return a pretty-printed version
of the AST. It's also available when running ``python -m astunparse``
as the ``--dump`` argument.
1.1.0 - 2014-04-01
~~~~~~~~~~~~~~~~~~
* ``unparse`` will return the source code for an AST. It is pretty
feature-complete, and round-trips the stdlib, and is compatible with
Python 2.7 and Python 3.4.
Running ``python -m astunparse`` will print the round-tripped source
for any python files given as argument.
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