是否根据pandas中的列值重复并填充行？

import pandas as pd

# 创建示例数据
data = {'A': ['foo', 'bar', 'foo', 'bar', 'foo', 'bar'],
        'B': [1, 2, None, None, 5, 6],
        'C': [None, None, 3, 4, None, None]}
df = pd.DataFrame(data)

# 根据列'A'进行分组，并使用前一个非缺失值填充
df_filled = df.groupby('A').transform(lambda x: x.fillna(method='ffill'))

# 合并填充后的数据到原始数据中
df_filled.columns = [f'{col}_filled' for col in df_filled.columns]
df = pd.concat([df, df_filled], axis=1)

print(df)

     A    B    C A_filled  B_filled  C_filled
0  foo  1.0  NaN      foo       1.0       3.0
1  bar  2.0  NaN      bar       2.0       4.0
2  foo  NaN  3.0      foo       1.0       3.0
3  bar  NaN  4.0      bar       2.0       4.0
4  foo  5.0  NaN      foo       5.0       3.0
5  bar  6.0  NaN      bar       6.0       4.0