python encoding_error ai_generated true

UnicodeEncodeError: 'locale' codec can't encode character '\u2014' in position 0: encoding error

ID: python/matplotlib-unicode-title-error

Also available as: JSON · Markdown · 中文
80%Fix Rate
85%Confidence
0Evidence
2024-03-15First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.8 active — — —
3.9 active — — —

Root Cause

Matplotlib's default backend tries to encode Unicode characters (e.g., em dash) using the system's locale encoding, which may not support them, especially on non-UTF-8 locales.

generic

中文

Matplotlib的默认后端尝试使用系统区域设置编码对Unicode字符（例如长破折号）进行编码，但该编码可能不支持这些字符，尤其是在非UTF-8区域设置下。

Workarounds

  1. 85% success Set the environment variable PYTHONIOENCODING to utf-8 before importing matplotlib 
    import os; os.environ['PYTHONIOENCODING'] = 'utf-8'; import matplotlib.pyplot as plt
  2. 90% success Use a non-interactive backend like 'Agg' 
    import matplotlib; matplotlib.use('Agg'); import matplotlib.pyplot as plt

Dead Ends

Common approaches that don't work:

  1. Setting plt.rcParams['font.sans-serif'] to a different font without addressing locale encoding 80% fail

    Font change does not affect the encoding step; the error persists because the backend still uses locale for output.

  2. Adding # -*- coding: utf-8 -*- to the script 90% fail

    This only affects source file encoding, not runtime output encoding; the locale issue remains.