如何将一系列Pandas dataframe行转换为具有多个值的一列？

import pandas as pd

df = pd.DataFrame({'ID': [1, 2, 3],
                   'Name': ['Alice', 'Bob', 'Charlie'],
                   'Subject1': [90, 85, 92],
                   'Subject2': [88, 90, 95],
                   'Subject3': [92, 87, 91]})

melted_df = pd.melt(df, id_vars=['ID', 'Name'], value_vars=['Subject1', 'Subject2', 'Subject3'], var_name='Subject', value_name='Score')

print(melted_df)

   ID     Name   Subject  Score
0   1    Alice  Subject1     90
1   2      Bob  Subject1     85
2   3  Charlie  Subject1     92
3   1    Alice  Subject2     88
4   2      Bob  Subject2     90
5   3  Charlie  Subject2     95
6   1    Alice  Subject3     92
7   2      Bob  Subject3     87
8   3  Charlie  Subject3     91