Pandas:从字典创建帧时，是什么决定了索引顺序？

import pandas as pd

data = {'Name': ['Alice', 'Bob', 'Charlie'],
        'Age': [25, 30, 35],
        'City': ['New York', 'London', 'Paris']}

df = pd.DataFrame(data)
print(df)

      Name  Age      City
0    Alice   25  New York
1      Bob   30    London
2  Charlie   35     Paris

df = pd.DataFrame(data, columns=['City', 'Name', 'Age'])
print(df)

       City     Name  Age
0  New York    Alice   25
1    London      Bob   30
2     Paris  Charlie   35