Question

我有一个python字典，并希望在初始化dict时将其中一个值设置为键本身。那就是：

dummy = dict(
  Key1 = ["SomeValue1", "Key1"],
  Key2 = ["SomeValue2", "Key2"],
  )

这可以通过程序化完成吗？也就是说，要再次跳过写入密钥并设置类似dummy.keys()[currentkeyindex]的内容。

Answer 1

使用dict comprehension：

>>> values = [
...     ["SomeValue1", "Key1"],
...     ["SomeValue2", "Key2"],
... ]
>>> {x[1]: x for x in values}
{'Key2': ['SomeValue2', 'Key2'], 'Key1': ['SomeValue1', 'Key1']}

Answer 2

如果您想跟踪项目，请使用defaultdict

>>> from collections import defaultdict                                                                                                      
>>> output = defaultdict(list)
>>> values = [
        ["SomeValue1", "Key1"],
        ["SomeValue2a", "Key2"],
        ["SomeValue2b", "Key2"]
    ]
>>> for x in values:
...     output[x[1]].append(x)
... 
>>> output
defaultdict(<type 'list'>, {
    'Key2': [['SomeValue2a', 'Key2'], ['SomeValue2b', 'Key2']], 
    'Key1': [['SomeValue1', 'Key1']]
})

Python字典：将值设置为键字符串

2 个答案: