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  1. class A(object):
  2.  
  3.     @classmethod
  4.     def demo_method(cls, a):
  5.         print(a)
  6.  
  7.  
  8. def decorator(function):
  9.     from functools import wraps
  10.     @wraps(function)
  11.     def wrapper(*args, **kwargs):
  12.         return_value = function(*args, **kwargs)
  13.         return return_value
  14.  
  15.     return wrapper
  16.  
  17.  
  18. setattr(A, 'demo_method', decorator(A.demo_method))
  19.  
  20. A.demo_method(1)
  21.  
Runtime error #stdin #stdout #stderr 0.01s 23296KB
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stdin
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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 20, in <module>
TypeError: unbound method demo_method() must be called with A instance as first argument (got int instance instead)
https://ideone.com/3I0Qaz
language:
Python (cpython 2.7.16)
created:
6 years ago
visibility:
public

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