(20200410已解决)ValueError: cannot set a frame with no defined index and a scalar

• 问题描述

  df_c.loc[:,'new_c'] = value出现如题错误。

• 解决方案

  原因是被赋值的df_c是空的。

  将原数据集中先设置一列value，在df_c这里直接取df的列不直接赋值。

  df.loc[:,'new_c1'] = value
  df_c = df.copy()
  df_c.loc[:,'new_c'] = df['new_c1']
  

• References

1. Cannot set a frame with no defined index and a value that cannot be converted to a Series