解决 SettingWithCopyWarning Try using .loc[row_indexer,col_indexer] = value instead

利用 Pandas 向 DataFrame 中插入一列数据时，出现警告：

SettingWithCopyWarning:
A value is trying to be set on a copy of a slice from a DataFrame.
Try using .loc[row_indexer,col_indexer] = value instead

解决办法：

先 copy 一份数据。

a = a.copy()
a['column'] = Your List