如何使用pandas解组列组并将其转换为行？

import pandas as pd

df = pd.DataFrame({'ID': [1, 2, 3],
                   'Name': ['Alice', 'Bob', 'Charlie'],
                   'Math': [90, 85, 95],
                   'Science': [80, 75, 85]})

melted_df = pd.melt(df, id_vars=['ID', 'Name'], value_vars=['Math', 'Science'], var_name='Subject', value_name='Score')

print(melted_df)

   ID     Name  Subject  Score
0   1    Alice     Math     90
1   2      Bob     Math     85
2   3  Charlie     Math     95
3   1    Alice  Science     80
4   2      Bob  Science     75
5   3  Charlie  Science     85