sigparse

Backports python3.10 typing features into python 3.7, 3.8, and 3.9.

Example

import sigparse

def func(param_a: list[str], param_b: str | int, param_c: tuple[int | None]):
    ...

# This returns the same result in python 3.7, 3.8, 3.9, and 3.10!
sigparse.sigparse(func)

Sigparse also supports classes.

import sigparse

class MyClass:
    a: list[str]
    b: str | int
    c: tuple[int | None]

sigparse.classparse(MyClass)

PEP 604

By default PEP 604 (| for unions) is only enabled for sigparse.sigparse and sigparse.classparse. The code for PEP 604 was written by @Endercheif.

To enable globally:

import sigparse
sigparse.global_PEP604()

Notes

Inspect

This module uses inspect behind the scenes. For that reason:

• All annotations are inspect._empty when there is no annotation.
• sigparse.Parameter.default is inspect._empty when there is no default value.
• sigparse.Parameter.kind is inspect._ParameterKind.
• sigparse.ClassVar.default is inspect._empty when there is no default value to maintain consistency.

Annotated

typing.Annotated will always be evaluated with include_extras=True in python3.9.