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  1. class Meta(type):
  2.     def __new__(cls, name, bases, attrs, **kwargs):
  3.         attrs['x'] = 0
  4.         ref = super().__new__(cls, name, bases, attrs)
  5.         ref.__dict__ = dict(ref.__dict__)
  6.         return ref
  7.     @property
  8.     def x(cls):
  9.         return cls.__dict__['x']
  10.  
  11. class Class(metaclass=Meta):
  12.     def __init__(self):
  13.         self.id = __class__.x
  14.         __class__.__dict__['x'] += 1
  15.  
  16. i = Class()
  17. j = Class()
  18. k = Class()
Runtime error #stdin #stdout #stderr 0.01s 28384KB
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Standard input is empty
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Standard output is empty
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Traceback (most recent call last):
  File "./prog.py", line 14, in <module>
  File "./prog.py", line 12, in __init__
TypeError: 'mappingproxy' object does not support item assignment
https://ideone.com/w3HqNf
language:
Python 3 (python  3.12)
created:
7 years ago
visibility:
public

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