})# 添加列 'D',其值为列 'A' 和 'B' 的和df_with_function = df.assign(D=lambdax: x['A'] + x['B']) print("\n使用函数创建新列 'D' 后的 DataFrame:") print(df_with_function) 4)同时添加多个新列 importpandasasnpimportpandasaspd# 创建一个示例 DataFramedf = pd.DataFrame({'A'...
Edit: This turned out to be an issue with the error message when setting a single column using a DataFrame with no columns; see #55956 (comment) - rhshadach Pandas version checks I have checked that this issue has not already been report...