如何在pandas DataFrame中拆分“number”以分隔列

import pandas as pd

# 创建一个包含"number"列的DataFrame
df = pd.DataFrame({'number': ['1-2-3', '4-5-6', '7-8-9']})

# 使用str.split()函数拆分"number"列
df[['number_1', 'number_2', 'number_3']] = df['number'].str.split('-', expand=True)

# 打印拆分后的DataFrame
print(df)

  number number_1 number_2 number_3
0  1-2-3        1        2        3
1  4-5-6        4        5        6
2  7-8-9        7        8        9