python config_error ai_generated true

ValueError: 'viridis' is not a valid colormap name. Valid names are: ['Accent', 'Accent_r', 'Blues', ...]

ID: python/matplotlib-cmap-name-error

Also available as: JSON · Markdown · 中文
80%Fix Rate
83%Confidence
0Evidence
2024-06-10First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.8 active — — —
3.9 active — — —

Root Cause

Using a typo in colormap name (e.g., 'viridis' instead of 'viridis'? Actually 'viridis' is correct; if user types 'viridiss' or 'virid' it fails). The error occurs when the string does not match any registered colormap.

generic

中文

颜色映射名称拼写错误（例如'viridis'拼写为'viridiss'）或使用了不存在的名称，导致无法找到匹配的颜色映射。

Workarounds

  1. 95% success Use the correct spelling from the list of valid colormaps 
    plt.imshow(data, cmap='viridis')
  2. 90% success List all available colormaps to find the correct one 
    from matplotlib import cm; print([m for m in cm._cmap_registry.keys()])

Dead Ends

Common approaches that don't work:

  1. Assuming case insensitivity and trying 'Viridis' 80% fail

    Colormap names are case-sensitive; 'Viridis' is not valid, only 'viridis' works.

  2. Using a numeric index like 0 for the first colormap 90% fail

    Colormaps are accessed by name, not numeric index.