parso 0.8.4

Description:

parso 0.8.4

Parso is a Python parser that supports error recovery and round-trip parsing
for different Python versions (in multiple Python versions). Parso is also able
to list multiple syntax errors in your python file.
Parso has been battle-tested by jedi. It was pulled out of jedi to be useful
for other projects as well.
Parso consists of a small API to parse Python and analyse the syntax tree.
A simple example:
>>> import parso
>>> module = parso.parse('hello + 1', version="3.9")
>>> expr = module.children[0]
>>> expr
PythonNode(arith_expr, [<Name: hello@1,0>, <Operator: +>, <Number: 1>])
>>> print(expr.get_code())
hello + 1
>>> name = expr.children[0]
>>> name
<Name: hello@1,0>
>>> name.end_pos
(1, 5)
>>> expr.end_pos
(1, 9)
To list multiple issues:
>>> grammar = parso.load_grammar()
>>> module = grammar.parse('foo +\nbar\ncontinue')
>>> error1, error2 = grammar.iter_errors(module)
>>> error1.message
'SyntaxError: invalid syntax'
>>> error2.message
"SyntaxError: 'continue' not properly in loop"

Resources

Testing
PyPI
Docs
Uses semantic versioning



Installation

pip install parso



Future

There will be better support for refactoring and comments. Stay tuned.
There’s a WIP PEP8 validator. It’s however not in a good shape, yet.



Known Issues

async/await are already used as keywords in Python3.6.
from __future__ import print_function is not ignored.



Acknowledgements

Guido van Rossum (@gvanrossum) for creating the parser generator pgen2
(originally used in lib2to3).
Salome Schneider
for the extremely awesome parso logo.


Changelog

Unreleased


0.8.4 (2024-04-05)

Add basic support for Python 3.13



0.8.3 (2021-11-30)

Add basic support for Python 3.11 and 3.12



0.8.2 (2021-03-30)

Various small bugfixes



0.8.1 (2020-12-10)

Various small bugfixes



0.8.0 (2020-08-05)

Dropped Support for Python 2.7, 3.4, 3.5
It’s possible to use pathlib.Path objects now in the API
The stubs are gone, we are now using annotations
namedexpr_test nodes are now a proper class called NamedExpr
A lot of smaller refactorings



0.7.1 (2020-07-24)

Fixed a couple of smaller bugs (mostly syntax error detection in
Grammar.iter_errors)

This is going to be the last release that supports Python 2.7, 3.4 and 3.5.


0.7.0 (2020-04-13)

Fix a lot of annoying bugs in the diff parser. The fuzzer did not find
issues anymore even after running it for more than 24 hours (500k tests).
Small grammar change: suites can now contain newlines even after a newline.
This should really not matter if you don’t use error recovery. It allows for
nicer error recovery.



0.6.2 (2020-02-27)

Bugfixes
Add Grammar.refactor (might still be subject to change until 0.7.0)



0.6.1 (2020-02-03)

Add parso.normalizer.Issue.end_pos to make it possible to know where an
issue ends



0.6.0 (2020-01-26)

Dropped Python 2.6/Python 3.3 support
del_stmt names are now considered as a definition
(for name.is_definition())
Bugfixes



0.5.2 (2019-12-15)

Add include_setitem to get_definition/is_definition and get_defined_names (#66)
Fix named expression error listing (#89, #90)
Fix some f-string tokenizer issues (#93)



0.5.1 (2019-07-13)

Fix: Some unicode identifiers were not correctly tokenized
Fix: Line continuations in f-strings are now working



0.5.0 (2019-06-20)

Breaking Change comp_for is now called sync_comp_for for all Python
versions to be compatible with the Python 3.8 Grammar
Added .pyi stubs for a lot of the parso API
Small FileIO changes



0.4.0 (2019-04-05)

Python 3.8 support
FileIO support, it’s now possible to use abstract file IO, support is alpha



0.3.4 (2019-02-13)

Fix an f-string tokenizer error



0.3.3 (2019-02-06)

Fix async errors in the diff parser
A fix in iter_errors
This is a very small bugfix release



0.3.2 (2019-01-24)

20+ bugfixes in the diff parser and 3 in the tokenizer
A fuzzer for the diff parser, to give confidence that the diff parser is in a
good shape.
Some bugfixes for f-string



0.3.1 (2018-07-09)

Bugfixes in the diff parser and keyword-only arguments



0.3.0 (2018-06-30)

Rewrote the pgen2 parser generator.



0.2.1 (2018-05-21)

A bugfix for the diff parser.
Grammar files can now be loaded from a specific path.



0.2.0 (2018-04-15)

f-strings are now parsed as a part of the normal Python grammar. This makes
it way easier to deal with them.



0.1.1 (2017-11-05)

Fixed a few bugs in the caching layer
Added support for Python 3.7



0.1.0 (2017-09-04)

Pulling the library out of Jedi. Some APIs will definitely change.