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.
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:
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.
typed-astunparse: extends astunparse to support type annotations.
unparses Python AST.
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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