如何在Python中将变量保存到For循环中的Dataframe？

import pandas as pd

df = pd.DataFrame(columns=['Variable'])

for variable in variables:
    df = df.append({'Variable': variable}, ignore_index=True)

import pandas as pd

# 创建空的DataFrame
df = pd.DataFrame(columns=['Variable'])

# For循环中保存变量到DataFrame
for variable in variables:
    df = df.append({'Variable': variable}, ignore_index=True)

# 打印DataFrame
print(df)