如何围绕包含在访问数据帧时忽略的额外列的pandas数据帧构建类

import pandas as pd

class CustomDataFrame:
    def __init__(self, data):
        self.data = data

    def drop_extra_columns(self, columns_to_ignore):
        self.data = self.data.drop(columns_to_ignore, axis=1)

    def get_data(self):
        return self.data

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

custom_df = CustomDataFrame(df)
custom_df.drop_extra_columns(['C'])

print(custom_df.get_data())

   A  B
0  1  4
1  2  5
2  3  6