Bug summary

Reading https://matplotlib.org/stable/users/explain/colors/colors.html#color-formats it would seem like color=("C0", .5) (C0 color with alpha=0.5) should work, but it doesn't.

(Could also be considered a doc bug or a feature request, strictly speaking.)

Code for reproduction

from pylab import *; plot([0, 1], c=("C0", .5))

Actual outcome

ValueError: ('C0', 0.5) is not a valid value for color

Expected outcome

No error.

Additional information

No response

Operating system

macos

Matplotlib Version

3.9.0.dev1178+g88d64e5f0c

Matplotlib Backend

any

Python version

3.12

Jupyter version

none

Installation

git checkout