创建一个五行三列的名为 df1 的DataFrame数组,列名为 [states,years,pops],行名['one','two','three','four','five'] 给df1添加新列，列名为 new_add，值为[7,4,5,8,2]

好的，这是您的问题：
创建一个五行三列的名为 df1 的DataFrame数组,列名为 [states,years,pops],行名['one','two','three','four','five'] 给df1添加新列，列名为 new_add，值为[7,4,5,8,2]
代码如下：

import pandas as pd
import numpy as np

# 创建 DataFrame 数组
df1 = pd.DataFrame(
    {'states': ['CA', 'TX', 'NY', 'FL', 'IL'],
     'years': [2016, 2016, 2017, 2018, 2017],
     'pops': [38332521, 26448193, 19651127, 19552860, 12882135]},
    index=['one', 'two', 'three', 'four', 'five'])

# 添加新列
df1['new_add'] = [7, 4, 5, 8, 2]

print(df1)

输出如下：

      states  years      pops  new_add
one       CA   2016  38332521        7
two       TX   2016  26448193        4
three     NY   2017  19651127        5
four      FL   2018  19552860        8
five      IL   2017  12882135        2