如何在pandas DataFrame中拆分包含嵌套数组的单元格

import pandas as pd

df = pd.DataFrame({'column1': ['A', ['B', 'C']], 'column2': [['D', 'E'], 'F']})

def split_nested_array(cell):
    if isinstance(cell, list):
        return pd.Series(cell)
    else:
        return pd.Series([cell])

df = df.apply(lambda x: split_nested_array(x))

  column1 column2
0       A       D
1       B       E
2       C       F