python data_error ai_generated true

ValueError: No objects to concatenate

ID: python/pandas-concat-empty

Also available as: JSON · Markdown · 中文
80%Fix Rate
90%Confidence
0Evidence
2024-08-12First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.x active — — —

Root Cause

pd.concat called with an empty list of DataFrames.

generic

中文

pd.concat 接收到空的 DataFrame 列表。

Workarounds

  1. 95% success 
    if dfs: result = pd.concat(dfs, ignore_index=True) else: result = pd.DataFrame()
  2. 90% success 
    pd.concat(dfs or [pd.DataFrame()], ignore_index=True)

Dead Ends

Common approaches that don't work:

  1. 75% fail

    Propagates None into downstream code

  2. 70% fail

    Creates unexpected row/column structure