main.py

def logging_decorator(func):
  def logging_wrapper(*args, **kwargs):
    print(f'Before {func.__name__}')
    result = func(*args, **kwargs)
    print(f'After {func.__name__}')
    return result
  return logging_wrapper

def log_all_class_methods(cls):
    class NewCls(object):
      def __init__(self, *args, **kwargs):
        self.original = cls(*args, **kwargs)
      
      def __getattribute__(self, s):
        try:    
          x = super(NewCls,self).__getattribute__(s)
        except AttributeError:      
          pass
        else:
          return x
        x = self.original.__getattribute__(s)
        if type(x) == type(self.__init__): 
          return logging_decorator(x)                 
        else:
          return x
    return NewCls
    
@log_all_class_methods
class SomeMethods:
  def func1(self):
    print('func1')
    
  def func2(self):
    print('func2')
    
methods = SomeMethods()
methods.func1()
> Before func1
> func1
> After func1