在Pandas Dataframe - Draftkings中只填充了json列表的最后一行

import pandas as pd

# 假设json_list是包含json数据的列表
json_list = [
    {"name": "John", "age": 25, "city": "New York"},
    {"name": "Alice", "age": 30, "city": "San Francisco"},
    {"name": "Bob", "age": None, "city": None},
]

# 将json列表转换为Dataframe
df = pd.json_normalize(json_list)

# 填充最后一行的缺失值
df.fillna(method='ffill', inplace=True)

# 打印填充后的Dataframe
print(df)

   name   age           city
0  John  25.0       New York
1 Alice  30.0  San Francisco
2   Bob  30.0  San Francisco