class MyFirstClass: def __init__(self, name): self.name = name def greet(self): print('Hello {}!'.format(self.name)) 现在来实例化一个类 my_instance = MyFirstClass('John Doe') print('my_instance: {}'.format(my_instance)) print('type: {}'.format(type(my_instance))) print('...
1. property是一个类,其作用是用来包装类的属性,这个属性可以根据实际需要,控制是否可读(设置fget参数)、可写(设置fset参数)、可删除(设置fdel参数)。 class C: def __init__(self): self._x = '_x in C' def getx(self): return self._x def setx(self, value): self._x = value def delx(...
importmath classCircle: def__init__(self, r): self.r=r @property defarea(self): returnself.r**2*math.pi @property defperimeter(self): returnself.r*2*math.pi c=Circle(10) print(c.r) print(c.area)#可以向访问数据属性一样去访问area,会触发一个函数的执行,动态计算出一个值 print(c....
#class Lazyproperty:#def __init__(self,func):## print('===>',func)#self.func=func#def __get__(self, instance, owner):#print('get')## print(instance)## print(owner)#if instance is None:#return self#res=self.func(instance)#setattr(instance,self.func.__name__,res)#return res#...
classproperty: "Emulate PyProperty_Type() in Objects/descrobject.c" def__init__(self, fget=None, fset=None, fdel=None, doc=None): self.fget = fget self.fset = fset self.fdel = fdel ifdocisNoneandfgetisnotNone: doc = fget.__doc__...
classFoo: def__init__(self,name,age): self.name=name self.age=age def__enter__(self):#当调用类Foo时就会触发__enter__方法 print('__enter__正在被触发') returnself#将类Foo的属性作为返回值 def__exit__(self,exc_type,exc_val,exc_tb):#self后的三个参数为必要属性 ...
class C(object): y = 3 z = 4 def __init__(self): self.__x = 2 def getx(self): return self.__x def setx(self, val): print "x is read only" x = property(getx, setx) #这不是真正的只读属性, 虽然在setx中,没有更新__x, 但你仍可对x属性赋值, 虽然复制不生效, 但也不报错...
classAnimal:@property defname(self):print('property name ')returnself._name @name.setter defname(self,val):print('property set name ')self._name=val @name.deleter defname(self):del self._name 这个时候 name 就是了特性了. 代码语言:javascript ...
classCls(object):def__init__(self):self.__x=None @property defx(self):returnself.__x @x.setter defx(self,value):self.__x=value @x.deleter defx(self):del self.__xif__name__=='__main__':c=Cls()c.x=100y=c.xprint("set & get y: %d"%y)del c.xprint("del c.x & y: ...
Get the pythonFile property: The URI of the Python file to be executed. DBFS paths are supported. Type: string (or Expression with resultType string). Returns: the pythonFile value. toJson public JsonWriter toJson(JsonWriter jsonWriter) Parameters: jsonWriter...