[英]How do you create nested dictionaries in Python?
我很難從下面提到的列表中創建嵌套字典:
student = ['Mike','Frank']
Type = ['Midterm1','Midterm2','Final']
Scores = [[10,20,30],[40,50,60]]
我正在尋找以下字典:
Scorecard = {'Mike':'Midterm':10,'Midterm2':20,'Final':30},'Frank':
{'Midterm':40,'Midterm2':50,'Final':60}}
我能夠創建學生和類型的組合,但是很難在學生級別嵌套類型和值。
輸出將是
scorecard['Mike']['Midterm'] = 10
['Mike']['Midterm2'] = 20
這是一個簡潔的單線:
In [4]: dict(zip(student, (dict(zip(Type, score)) for score in Scores)))
Out[4]:
{'Frank': {'Final': 60, 'Midterm1': 40, 'Midterm2': 50},
'Mike': {'Final': 30, 'Midterm1': 10, 'Midterm2': 20}}
這里的循環更加明確了:
In [5]: scorecard = {}
In [6]: for st, score in zip(student, Scores):
...: scorecard[st] = dict(zip(Type,score))
...:
...:
In [7]: scorecard
Out[7]:
{'Frank': {'Final': 60, 'Midterm1': 40, 'Midterm2': 50},
'Mike': {'Final': 30, 'Midterm1': 10, 'Midterm2': 20}}
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