pandas dataframe:有没有办法在pandas中将列转换为行值？

import pandas as pd

# 创建一个示例DataFrame
data = {'Name': ['John', 'Mike', 'Sarah'],
        'Math': [90, 85, 95],
        'Science': [80, 92, 88]}
df = pd.DataFrame(data)

# 使用melt()函数将列转换为行值
melted_df = pd.melt(df, id_vars=['Name'], value_vars=['Math', 'Science'], var_name='Subject', value_name='Score')

print(melted_df)

   Name  Subject  Score
0  John     Math     90
1  Mike     Math     85
2 Sarah     Math     95
3  John  Science     80
4  Mike  Science     92
5 Sarah  Science     88