Python的類繼承

# Defining a Base class to be shared among many other classes later: 

class Base(dict): 
    """Base is the base class from which all the class will derrive. 
    """ 
    name = 'name'  
    def __init__(self): 
     """Initialise Base Class 
     """ 
     dict.__init__(self) 
     self[Base.name] = "" 

# I create an instance of the Base class: 

my_base_instance = Base() 

# Since a Base class inherited from a build in 'dict' the instance of the class is a dictionary. I can print it out with: 

print my_base_instance Results to: {'name': ''} 


# Now I am defining a Project class which should inherit from an instance of Base class: 

class Project(object): 
    def __init__(self): 
     print "OK" 
     self['id'] = '' 

# Trying to create an instance of Project class and getting the error: 

project_class = Project(base_class) 

TypeError: __init__() takes exactly 1 argument (2 given)

來源

2014-01-08 alphanumeric

您必須在定義類（'class Project（Base）'）時聲明繼承，而不是在實例化時聲明繼承。 – Hyperboreus

有兩個錯誤在你的代碼：

1）類繼承

class Project(Base): # you should inherit from Base here... 
    def __init__(self): 
     print "OK" 
     self['id'] = ''

2）實例的定義（您__init__並不需要任何明確的參數，而且可以肯定不是祖先類）

project_class = Project() # ...and not here since this is an instance, not a Class

來源

2014-01-08 20:27:25 furins

當你正在實例化一個類時，你不需要傳入base_class。這是定義完成的。 __init__只需要1個參數，即self，並且是自動的。你只需要調用

project_class = Project()

來源

2014-01-08 20:23:48 mhlester

對於項目從基本繼承，你不應該從對象繼承它，但來自基地即class Project(Base)。當您實例化Project類時，您會收到TypeError: init() takes exactly 1 argument (2 given)錯誤，因爲構造函數只帶1個參數（self），並且您也通過base_class。由python隱式傳遞'self'。

來源

2014-01-08 20:24:07 praveen

Python的類繼承

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