python runtime_error ai_generated true

RuntimeWarning: More than 20 figures have been opened. Figures created with the pyplot interface (matplotlib.pyplot) are retained until explicitly closed and may consume too much memory.

ID: python/matplotlib-memory-leak-animation

Also available as: JSON · Markdown · 中文
80%Fix Rate
86%Confidence
0Evidence
2024-06-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.8 active — — —
3.9 active — — —

Root Cause

Creating many figures in a loop without closing them, leading to memory accumulation.

generic

中文

在循环中创建了大量图形但未关闭，导致内存累积。

Workarounds

  1. 95% success Close figures after use with plt.close() 
    for i in range(100): plt.figure(); plt.plot([1,2,3]); plt.close()
  2. 90% success Use plt.close('all') at the end of the loop 
    for i in range(100): plt.figure(); plt.plot([1,2,3]); plt.close('all')

Dead Ends

Common approaches that don't work:

  1. Increasing the warning threshold via rcParams 90% fail

    This silences the warning but does not fix the memory leak.

  2. Using plt.ioff() to disable interactive mode 70% fail

    This only affects display, not memory management.