Question

import pandas as pd

df = [{'fruit': 'apple', 'color': 'red', 'response': 'right'},
     {'fruit': 'apple',  'color': 'red', 'response': 'wrong'},
     {'fruit': 'pineapple',  'color': 'green',  'response': 'True' },
     {'fruit': 'pineapple',  'color': 'green',  'response': 'wrong' },
     {'fruit': 'orange',  'color': 'orange',  'response': 'wrong' }]



df = pd.DataFrame(df)

我要删除重复的水果和颜色观测值的组合，其中响应=“错误”

Answer 1

您可以使用drop_duplicates

例如：

import pandas as pd
df = [{'fruit': 'apple', 'color': 'red', 'response': 'right'},
     {'fruit': 'apple',  'color': 'red', 'response': 'wrong'},
     {'fruit': 'pineapple',  'color': 'green',  'response': 'True' },
     {'fruit': 'pineapple',  'color': 'green',  'response': 'wrong' },
     {'fruit': 'orange',  'color': 'orange',  'response': 'wrong' }]

df = pd.DataFrame(df)
print(df.drop_duplicates(['fruit','color']))

输出：

    color      fruit response
0     red      apple    right
2   green  pineapple     True
4  orange     orange    wrong

Answer 2

首先对“响应”列进行排序

df.sort_values(['response'], inplace=True)

输出

   color      fruit response 
2   green  pineapple     True
0     red      apple    right
1     red      apple    wrong
3   green  pineapple    wrong
4  orange     orange    wrong

然后您可以使用删除重复的值

df.drop_duplicates(['color','fruit'], inplace = True)

输出

    color      fruit response
2   green  pineapple     True
0     red      apple    right
4  orange     orange    wrong

您可以使用-

将数据框转换为与排序之前相同的顺序

df.sort_index(axis=0, inplace= True)

输出

    color      fruit response
0     red      apple    right
2   green  pineapple     True
4  orange     orange    wrong

这将为您提供所需的输出

有关数据操作的查询

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