如果多次使用密钥，如何从数据框创建字典？

Question

我有一个包含日期、代码和收盘价的数据框有些行具有相同的日期

key= date value= ticker value close

import pandas as pd

data = {'Ticker': ['laptop', 'printer', 'tablet', 'desk', 'chair'],
    'close': [1200, 150, 300, 450, 200]
    }

df = pd.DataFrame(data, index= 
['27/01/2022','27/01/2022','25/01/2022','24/01/2022','23/01/2022'])
df

          Ticker    close
27/01/2022  laptop  1200
27/01/2022  printer 150
25/01/2022  tablet  300
24/01/2022  desk    450
23/01/2022  chair   200

我正在尝试获取如下所示的字典

Key
27/01/2022 laptop : 1200, printer : 150
25/01/2022 tablet : 300
24/01/2022 desk 450
23/01/2022 chair 200

Answer 1

正如 baileythegreen 在评论中提到的那样，您的样本输出不是有效的字典。如果你想要输出

{'23/01/2022': {'chair': 200},
 '24/01/2022': {'desk': 450},
 '25/01/2022': {'tablet': 300},
 '27/01/2022': {'laptop': 1200, 'printer': 150}}

你可以做到

{date: dict(zip(sub_df['Ticker'], sub_df['close']))
    for date, sub_df in df.groupby(df.index)}

如果多次使用密钥，如何从数据框创建字典？

How to create a dictionary from a dataframe if the key is used multiple times?

python

dictionary

nested