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시퀀스4 강의 질문
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from types import MappingProxyType
d={'key1':'value1'}
d_frozen = MappingProxyType(d)
print(d)
print(d_frozen)
d['key2'] = 'value2'
print(d)
print(d_frozen) 하면 d_frozen의 값도 같이 변경이되는대 immutable아니잖아요.
djangopython
Answer 1
1
niceman
Instructor
In [1]: from types import MappingProxyType
In [2]: d = {'a': 1, 'b': 2}
In [3]: m = MappingProxyType(d)
In [4]: m['a']
Out[4]: 1
In [5]: m['a'] = 5
TypeError: 'mappingproxy' object does not support item assignment
In [6]: d['a'] = 42
In [7]: m['a']
Out[7]: 42
In [8]: for i in m.items():
...: print(i)
('a', 42)
('b', 2)
위 코드 참조하시기 바랍니다.