字典键中的通配符 [英] Wildcard in dictionary key

问题描述

假设我有一本字典:

rank_dict = {'V*': 1, 'A*': 2, 'V': 3,'A': 4}

如您所见，我在一个V的末尾添加了一个*.而3可能只是V的值，我想要另一个V1，V2，V2234432等键...我想检查一下反对:

As you can see, I have added a * to the end of one V. Whereas a 3 may be the value for just V, I want another key for V1, V2, V2234432, etc...I want to check it against:

checker = 'V30'

并获取值.正确的语法是什么?

and get the value. what is the correct syntax for this?

for k, v in rank_dict.items():
    if checker == k:
        print(v)

推荐答案

您可以使用

You can use fnmatch.fnmatch to match Unix shell-style wildcards:

>>> import fnmatch
>>> fnmatch.fnmatch('V34', 'V*')
True

---

>>> rank_dict = {'V*': 1, 'A*': 2, 'V': 3,'A': 4}
>>> checker = 'V30'
>>> for k, v in rank_dict.items():
...     if fnmatch.fnmatch(checker, k):
...         print(v)
... 
1

注意:每次查找的时间复杂度为O(n).对于大型词典，这可能会成为一个问题.仅当查询性能不成问题时才建议使用.

NOTE: Every lookup will have O(n) time complexity. This may become an issue with large dictionaries. Recommended only if lookup performance is not an issue.

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