[Bug]: color=("Cn", alpha) does not work #27827

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1. anntzer

   added

   topic: color/alpha

   topic: color/cycle

   on Feb 27, 2024
2. ksunden commented on Feb 27, 2024

   

   ksunden

   on Feb 27, 2024

   Member

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   the precise logic that parses 2-element tuples into color/alpha is:

   matplotlib/lib/matplotlib/colors.py

   Lines 321 to 325 in 5e34777

   	if isinstance(c, tuple) and len(c) == 2:
   	if alpha is None:
   	c, alpha = c
   	else:
   	c = c[0]

   This appears in the private function _to_rgba_no_colorcycle. This function is only ever called from to_rgba (after handling the Cn case specially). Moving (or adding, I guess) the same lines to the beginning of the public to_rgba would allow ("C0", 0.5) and likely not have too many other repercussions.
3. FilBalza commented on Jul 14, 2024

   

   FilBalza

   on Jul 14, 2024

   Contributor

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   When trying to solve this issue, I saw that the suggested solution was already added and the code now works. Here's the commit for reference: 13b8718

   👍React with 👍1Reacted by Ruth Comer
4. rcomer

   closed this as completedon Jul 14, 2024
5. rcomer

   added this to the v3.9.1 milestone on Jul 14, 2024
6. rcomer commented on Jul 14, 2024

   

   rcomer

   on Jul 14, 2024

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   Fixed by #28436