The NoReturn type The NoReturn type Mypy provides support for functions that never return. Forexample, a function that unconditionally raises an exception: from typing impor...

None and Optional handling None and Optional handling The following flags adjust how mypy handles values of type None .For more details, see Disabling strict optional checking ...

Check that attribute exists in each union item [union-attr] Check that attribute exists in each union item [union-attr] If you access the attribute of a value with a union type...

TypedDict Totality Supported operations Class-based syntax Mixing required and non-required items Unions of TypedDicts TypedDict Python programs often use dictionaries wit...

Specifying what to type check Specifying what to type check By default, you can specify what code you want mypy to type checkby passing in the paths to what you want to have ty...

Protocols and structural subtyping Protocols and structural subtyping Mypy supports two ways of deciding whether two classes are compatibleas types: nominal subtyping and struc...

Start small Start small If your codebase is large, pick a subset of your codebase (say, 5,000to 50,000 lines) and run mypy only on this subset at first,without any annotations....

Inline configuration Inline configuration Mypy supports setting per-file configuration options inside files themselvesusing # mypy: comments. For example: # mypy: disallow-an...

Declaring literal variables Declaring literal variables You must explicitly add an annotation to a variable to declare that it hasa literal type: a : Literal [ 19 ] = 19...

Miscellaneous strictness flags Miscellaneous strictness flags allow_untyped_globals (bool, default False) Causes mypy to suppress errors caused by not being able to fullyinfe...