将新变量添加到dataframe中的特定位置，但不指定编号位置

new_variable = pd.Series([value1, value2, value3, ...], name='new_variable')

dataframe.insert(loc, column, value)

import pandas as pd

# 创建一个示例DataFrame
data = {'A': [1, 2, 3],
        'B': [4, 5, 6],
        'C': [7, 8, 9]}
df = pd.DataFrame(data)

# 创建一个新的Series对象
new_variable = pd.Series([10, 11, 12], name='new_variable')

# 将新变量插入到特定位置
df.insert(1, 'new_variable', new_variable)

# 打印DataFrame
print(df)

   A  new_variable  B  C
0  1            10  4  7
1  2            11  5  8
2  3            12  6  9