json到pandas dataframe，其中第一列值在所有行中都相同

import json
import pandas as pd

json_data = '{"data": [{"id": 1, "name": "Alice", "age": 25}, {"id": 2, "name": "Bob", "age": 30}]}'
data = json.loads(json_data)

df = pd.DataFrame(data["data"])

df = df.assign(new_column=df.iloc[0, 0])

print(df)

import json
import pandas as pd

json_data = '{"data": [{"id": 1, "name": "Alice", "age": 25}, {"id": 2, "name": "Bob", "age": 30}]}'
data = json.loads(json_data)

df = pd.DataFrame(data["data"])
df = df.assign(new_column=df.iloc[0, 0])

print(df)

   id   name  age  new_column
0   1  Alice   25           1
1   2    Bob   30           1