python data_error ai_generated true

pandas.errors.DtypeWarning: Columns (2,5) have mixed types. Specify dtype option on import or set low_memory=False.

ID: python/pandas-dtype-warning-mixed

Also available as: JSON · Markdown · 中文
80%Fix Rate
88%Confidence
0Evidence
2024-07-16First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.x active — — —

Root Cause

CSV column contains mixed data types; pandas infers chunk-wise dtype.

generic

中文

CSV 列包含混合数据类型；pandas 分块推断 dtype 时产生不一致。

Workarounds

  1. 95% success 
    pd.read_csv(path, dtype={'col2': str, 'col5': str})
  2. 85% success 
    pd.read_csv(path, converters={'col2': lambda x: x.strip()})

Dead Ends

Common approaches that don't work:

  1. 70% fail

    Silences warning but keeps object dtype; downstream ops still break

  2. 75% fail

    Values may be parsed as strings, breaking numeric ops