在Python Pandas中，如何获取所有的值，直到某个定义的值，才能改变数据框中的列名？

import pandas as pd

def change_column_names(df, stop_value, new_names):
    column_names = df.columns.tolist()
    new_column_names = []

    for column_name in column_names:
        if column_name == stop_value:
            break
        new_column_names.append(new_names.get(column_name, column_name))

    return df.rename(columns=dict(zip(column_names, new_column_names)))

# 示例数据框
df = pd.DataFrame({'A': [1, 2, 3], 'B': [4, 5, 6], 'C': [7, 8, 9]})

# 定义要修改的列名映射
new_names = {'A': 'New_A', 'B': 'New_B'}

# 修改列名直到遇到列名为'C'
modified_df = change_column_names(df, 'C', new_names)

# 输出修改后的数据框
print(modified_df)

   New_A  New_B  C
0      1      4  7
1      2      5  8
2      3      6  9