astunparse 1.6.1

An AST unparser for Python

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.

Changelog

Here’s the recent changes to AST Unparser.

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.