Python 仅列出嵌套数据框中的第一行
我只想列出嵌套数据框中的第一行 例如:Python 仅列出嵌套数据框中的第一行,python,pandas,dataframe,nested,Python,Pandas,Dataframe,Nested,我只想列出嵌套数据框中的第一行 例如: { "client" : "Mario", "purchase" : [ { "_id" :1, "date" : 01-01-2019, "product" : "X" }, { "_id" :2, "date" : 05-01-2019, "product"
{
"client" : "Mario",
"purchase" : [
{
"_id" :1,
"date" : 01-01-2019,
"product" : "X"
},
{
"_id" :2,
"date" : 05-01-2019,
"product" : "Y"
},
{
"_id" :3,
"date" : 08-01-2019,
"product" : "Z"
}
]
},
{
"client" : "Luigi",
"purchase" : [
{
"_id" :1,
"date" : 02-01-2019,
"product" : "A"
},
{
"_id" :2,
"date" : 04-01-2019,
"product" : "B"
},
{
"_id" :3,
"date" : 06-01-2019,
"product" : "C"
}
]
}
我需要这样的第一次购买:
Mario 01-01-2019
Luigi 02-01-2019
谢谢你的帮助
import pandas as pd
df = pd.DataFrame(d)
df['purchase'] = df['purchase'].apply(lambda row : row[0]['date'])
df = df.rename(columns={'purchase': 'purchase_date'})
print(df)
注意:我通过在粘贴内容之外添加[]
来获取变量d
,并在日期周围添加“”
结果是:
client purchase_date
0 Mario 01-01-2019
1 Luigi 02-01-2019
数据帧在哪里?