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  1. import math
  2.  
  3. class Circulo():
  4.     def __init__(self):
  5.         super()
  6.         self.__raio = None
  7.  
  8.     def get_perimetro(self):
  9.         return 2 * math.pi * self.raio
  10.  
  11.     def get_area(self):
  12.         return math.pi * self.raio ** 2
  13.  
  14.     @property
  15.     def raio(self):
  16.         return self.__raio
  17.  
  18.     @raio.setter
  19.     def raio(self, x):
  20.         self.__raio = x
  21.  
  22.     def __setattr__(self, key, value):
  23.         if not hasattr(self, key):
  24.             raise TypeError("Não pode criar atributos para esta classe")
  25.         object.__setattr__(self, key, value)
  26.  
  27. c = Circulo()
  28. c.raio = 2 # ok
  29. c.lado = 2 # AttributeError
Runtime error #stdin #stdout #stderr 0.01s 27720KB
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Standard input is empty
stdout
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Standard output is empty
stderr
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Traceback (most recent call last):
  File "./prog.py", line 27, in <module>
  File "./prog.py", line 6, in __init__
  File "./prog.py", line 24, in __setattr__
TypeError: Não pode criar atributos para esta classe
https://ideone.com/cbZdJh
language:
Python 3 (python  3.9.5)
created:
6 years ago
visibility:
public

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