参见文档：http :
//pandas.pydata.org/pandas-
docs/stable/genic/pandas.Dataframe.insert.html
使用loc = 0将在开头插入
df.insert(loc, column, value)
df = pd.Dataframe({'B': [1, 2, 3], 'C': [4, 5, 6]})dfOut: B C0 1 41 2 52 3 6idx = 0new_col = [7, 8, 9] # can be a list, a Series, an array or a scalar df.insert(loc=idx, column='A', value=new_col)dfOut: A B C0 7 1 41 8 2 52 9 3 6
