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Python Immutable Dictionary, Set 본문
Immutable dictionary: MappingProxyType
Immutable Set: Frozenset
from types import MappingProxyType
d = {'a': 'apple', 'b': 'banana', 'c': 'carrot'}
d_fixed = MappingProxyType(d)
print(d_fixed['a'])
s = frozenset([1, 2, 3])
print(s)
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