使用循环填充不同长度的pandas Dataframe列

import pandas as pd

df = pd.DataFrame(columns=['col1', 'col2'], dtype=int)

data = [{'col1': 1, 'col2': 2}, {'col1': 3, 'col2': 4}, {'col1': 5, 'col2': 6}]

for row in data:
    df = df.append(row, ignore_index=True)

for row in data:
    if len(row['col1']) > len(row['col2']):
        row['col2'].extend([0] * (len(row['col1']) - len(row['col2'])))
    elif len(row['col2']) > len(row['col1']):
        row['col1'].extend([0] * (len(row['col2']) - len(row['col1'])))
    df = df.append(row, ignore_index=True)