python module_error ai_generated true

ValueError: Unknown projection '3d'

ID: python/matplotlib-3d-proj-not-registered

Also available as: JSON · Markdown · 中文
80%Fix Rate
88%Confidence
0Evidence
2024-09-19First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.x active — — —

Root Cause

Using add_subplot(projection='3d') without importing mpl_toolkits.mplot3d, so the projection is not registered.

generic

中文

在未导入 mpl_toolkits.mplot3d 的情况下使用 add_subplot(projection='3d')，导致投影未注册。

Workarounds

  1. 96% success 
    import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d import Axes3D  # noqa: F401
fig = plt.figure()
ax = fig.add_subplot(111, projection='3d')
  2. 93% success 
    import matplotlib.pyplot as plt
ax = plt.axes(projection='3d')
ax.plot3D([0,1,2], [0,1,2], [0,1,2])

Dead Ends

Common approaches that don't work:

  1. 90% fail

    mpl_toolkits ships with matplotlib; installing it separately is unnecessary and may cause version conflicts.

  2. 85% fail

    Matplotlib projection names are case-sensitive; '3D' is not registered either.