typed-astunparse is to typed-ast as astunparse is to ast
Unparser for Python 3 abstract syntax trees (ASTs) with type comments.
The typed-astunparse is to typed-ast as astunparse is to ast. In short: unparsing of Python 3 abstract syntax trees (ASTs) with type comments.
Why this module was created
The built-in ast module can parse Python source code into AST but it can’t generate source code from the AST. The astunparse module (using a refactored version of an obscure script found in official Python repository) provides code generation capability for native Python AST.
However, both ast and astunparse modules completely ignore type comments introduced in
PEP 484. They treat them like all other comments, so when you parse the code using
compile(), your type comments will be lost. There is no place for them in the AST, so
obviously they also cannot be unparsed.
The typed-ast module provides an updated AST including type comments defined in PEP 484 and a parser for Python code that contains such comments.
Unfortunately, typed-ast doesn’t provide any means to go from AST back to source code with type comments. This is why module typed-astunparse (i.e. this one) was created: to provide unparser for AST defined in typed-ast.
Example of roundtrip from code through AST to code:
import typed_ast.ast3 import typed_astunparse code = 'my_string = None # type: str' roundtrip = typed_astunparse.unparse(typed_ast.ast3.parse(code)) print(roundtrip)
This will print:
my_string = None # type: str
for more examples see examples.ipynb notebook.
For simplest installation use
pip3 install typed-astunparse
You can also build your own version:
git clone https://github.com/mbdevpl/typed-astunparse cd typed-astunparse pip3 install -U test_requirements.txt python3 -m unittest # make sure the tests pass python3 setup.py bdist_wheel pip3 install dist/*.whl
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