============ 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.