Pandas dataframe在类中使用列表分隔复制行？

import pandas as pd

df = pd.DataFrame({'A': [1, 2, 3], 'B': [4, 5, 6]})

class MyClass:
    def separate_copy_rows(self, df, column_name):
        new_rows = []
        for index, row in df.iterrows():
            values = row[column_name].split(',')
            for value in values:
                new_row = row.copy()
                new_row[column_name] = value
                new_rows.append(new_row)
        new_df = pd.DataFrame(new_rows)
        return new_df

my_class = MyClass()
new_df = my_class.separate_copy_rows(df, 'A')
print(new_df)