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1import collections
2import typing
5# from jaraco.collections 3.3
6class FreezableDefaultDict(collections.defaultdict):
7 """
8 Often it is desirable to prevent the mutation of
9 a default dict after its initial construction, such
10 as to prevent mutation during iteration.
12 >>> dd = FreezableDefaultDict(list)
13 >>> dd[0].append('1')
14 >>> dd.freeze()
15 >>> dd[1]
16 []
17 >>> len(dd)
18 1
19 """
21 def __missing__(self, key):
22 return getattr(self, '_frozen', super().__missing__)(key)
24 def freeze(self):
25 self._frozen = lambda key: self.default_factory()
28class Pair(typing.NamedTuple):
29 name: str
30 value: str
32 @classmethod
33 def parse(cls, text):
34 return cls(*map(str.strip, text.split("=", 1)))