[Bug]: typing.get_type_hints fails for multiple pyplot plotting functions #28977
Description
Bug summary
typing.get_type_hints throws error name 'ArrayLike' is not defined for pyplot functions such as plot,scatter,imshow etc.
Code for reproduction
%pip install -U matplotlib # colab
import typing
import matplotlib.pyplot
import matplotlib.typing # sanity check, typing exist
print(matplotlib.pyplot.imshow.__annotations__)
typing.get_type_hints(matplotlib.pyplot.imshow)Actual outcome
{'X': 'ArrayLike | PIL.Image.Image', 'cmap': 'str | Colormap | None', 'norm': 'str | Normalize | None', 'aspect': "Literal['equal', 'auto'] | float | None", 'interpolation': 'str | None', 'alpha': 'float | ArrayLike | None', 'vmin': 'float | None', 'vmax': 'float | None', 'origin': "Literal['upper', 'lower'] | None", 'extent': 'tuple[float, float, float, float] | None', 'interpolation_stage': "Literal['data', 'rgba'] | None", 'filternorm': 'bool', 'filterrad': 'float', 'resample': 'bool | None', 'url': 'str | None', 'return': 'AxesImage'}
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
[<ipython-input-6-616de5754b17>](https://localhost:8080/#) in <cell line: 7>()
5
6 print(matplotlib.pyplot.imshow.__annotations__)
----> 7 typing.get_type_hints(matplotlib.pyplot.imshow)
3 frames
/usr/local/lib/python3.10/dist-packages/matplotlib/pyplot.py in <module>
NameError: name 'ArrayLike' is not defined
Expected outcome
a dictionary with correctly populated classes, no error
from numpy.typing import ArrayLike
def imshow(X: ArrayLike):
pass
typing.get_type_hints(imshow){'X': typing.Union[numpy._typing._array_like._SupportsArray[numpy.dtype[typing.Any]], numpy._typing._nested_sequence._NestedSequence[numpy._typing._array_like._SupportsArray[numpy.dtype[typing.Any]]], bool, int, float, complex, str, bytes, numpy._typing._nested_sequence._NestedSequence[bool | int | float | complex | str | bytes]]}
Additional information
when using colab matplotlib needs to be upgraded to include typing annotations
Operating system
Ubuntu
Matplotlib Version
3.9.2
Matplotlib Backend
module://matplotlib_inline.backend_inline
Python version
3.10.12
Jupyter version
6.5.5
Installation
pip