動態創建函數的類中

Question

我如何動態地在一個類中創建函數在python，這樣我可以做;

client = Client() 
client.dynamic_function() 
client.another_dynamic_function(params=123) 

dynamic_function需求也需要接受調用它時，我可以使用的選項。

Answer 1

這將使你能夠做到這一點

class Client(object): 

    @classmethod 
    def _register(cls, name, **create_kwargs): 
     def func(**kwargs): 
      # Call your dynamic things in here... 
      return kwargs 

     def call(self, **kwargs): 
      print('calling dynamic function {name}, created with ({create_kwargs})) results being: {result}'.format(name=name, create_kwargs=create_kwargs, result=func(**kwargs))) 

     call.__name__ = name 
     setattr(cls, name, call) 

Client._register('dynamic1') 
Client._register('dynamic2', option=123) 


if __name__ == '__main__': 
    client = Client() 
    client.dynamic1() 
    client.dynamic1(something=111) 
    client.dynamic2() 
    client.dynamic2(something=222) 
    print(dir(client)) 

產生輸出：

calling dynamic function dynamic1, created with ({})) results being: {} 
calling dynamic function dynamic1, created with ({})) results being: {'something': 111} 
calling dynamic function dynamic2, created with ({'option': 123})) results being: {} 
calling dynamic function dynamic2, created with ({'option': 123})) results being: {'something': 222} 
['__class__', '__delattr__', '__dict__', '__doc__', '__format__', '__getattribute__', '__hash__', '__init__', '__module__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', '_register', 'dynamic1', 'dynamic2'] 

一個真實世界的實現（它們不再使用）位於here。基於commitlog，原因是This allows us to add docstrings and stricter mypy annotations.。

有可能做到這一點更Python的方式。但是，這工作正常，以及:)