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  1. import inspect
  2.  
  3. class BaseMeta(type):
  4.  
  5.     def __init__(cls, name, bases, namespace):
  6.         super().__init__(name, bases, namespace)
  7.         # check if cls.f is a static method
  8.         if not inspect.isfunction(cls.f):
  9.             raise Exception("f should be a static method")
  10.         # check if cls.g is a static method
  11.         if not (inspect.ismethod(cls.g) and cls.g.__self__ == cls):
  12.             raise Exception("g should be a class method")
  13.  
  14. class Base(metaclass=BaseMeta):
  15.  
  16.     @staticmethod
  17.     def f():
  18.         print("Base.f")
  19.  
  20.     @classmethod
  21.     def g(cls):
  22.         print("Base.g")
  23.  
  24.     def h(self):
  25.         print("Base.h")
  26.  
  27. class A(Base):
  28.  
  29.     def f():
  30.         print("A.f")
  31.  
  32. class B(Base):
  33.  
  34.     def g(cls):
  35.         print("B.g")
Runtime error #stdin #stdout #stderr 0.02s 30704KB
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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 32, in <module>
  File "./prog.py", line 12, in __init__
Exception: g should be a class method
https://ideone.com/288YGK
language:
Python 3 (python  3.12)
created:
9 years ago
visibility:
public

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