PyType

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PyType is a static type analyzer from Google. This talk tells you how it differs from the better known MyPy.

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Pytype checks and infers types for your Python code - without requiring type annotations. Pytype can:

  • Lint plain Python code, flagging common mistakes such as mispelled attribute names, incorrect function calls, and much more, even across file boundaries.
  • Enforce user-provided type annotations. While annotations are optional for pytype, it will check and apply them where present.
  • Generate type annotations in standalone files ("pyi files"), which can be merged back into the Python source with a providedmerge-pyi tool.

Pytype is a static analyzer, meaning it does not execute the code it runs on.

Thousands of projects at Google rely on pytype to keep their Python code well-typed and error-free.

For more information, check out the user guide or FAQ.