import pandas as pd

df = pd.DataFrame(
   {
      "x": [5, 2, 7, 0],
      "y": [4, 7, 5, 1],
      "z": [9, 3, 5, 1]
   }
)

print"输入的DataFrame 1为:\n", df
columns = df.columns
print"给定DataFrame中的列: ", columns

column_name = "z"
column_index = columns.get_loc(column_name)
print"列 ", column_name, " 的索引为: ", column_index

column_name = "x"
column_index = columns.get_loc(column_name)
print"列 ", column_name, " 的索引为: ", column_index

column_name = "y"
column_index = columns.get_loc(column_name)
print"列 ", column_name, " 的索引为: ", column_index

输入的DataFrame 1为:
x y z
0 5 4 9
1 2 7 3
2 7 5 5
3 0 1 1

给定DataFrame中的列: Index(['x', 'y', 'z'],
dtype='object')

列 z 的索引为: 2
列 x 的索引为: 0
列 y 的索引为: 1