matplotlib.cm.rainbow cannot be resolved

[xuke444]

Environment data

• Language Server version: vscode python extension v2020.6.89148
• OS and version: windows 10
• Python version (& distribution if applicable, e.g. Anaconda): 3.7.7

Expected behaviour

create an conda env with python 3.7 pip install matplotlib==3.2.2

then create py file will flowing code.

import matplotlib.cm as cm cm.rainbow(xxxx)

it says Module 'matplotlib.cm' has no 'rainbow' member

Actual behaviour

XXX

Logs

XXX

Code Snippet / Additional lnformation

XXX

[xuke444]

to clarify auto complete, and go to definition also not working. but run time passes.