Q: How do I get a python object’s class name? A: Use the object’s __class__ attribute and then get its __name__ attribute. Another python introspection gem, to get an object’s class name just access its __cl
class reptile(object)和class snake(reptile)就是代表父子关系。object是reptile的基类,reptile是snake的超类(基类)。这里有没有想起来 object是所有类的超类? Squasher = snake()是类型实例关系。将类snake实例化就得到了Squasher。 这时候,有两条很有用的规则: Dashed Arrow Up Rule:If X is an instance of A...
classMyClass:i=12345# 类变量(类属性)# 构造方法,用于初始化类的实例def__init__(self,name,data):self.name=name# 实例属性self.data=[]# 实例属性# 实例方法defappend(self,value):self.data.append(value)# 实例方法defget_name(self):returnself.name# 类对象属性引用print(MyClass.i)# 12345# 类...
c = MyClass(5)print(c.x)# 输出5delc.x# print(c.x) # AttributeError: 'MyClass' object has no attribute '_x' 6. @cached_property 缓存属性,只计算一次,后续访问直接返回缓存值。 fromcached_propertyimportcached_propertyclassMyClass:@cached_propertydefx(self):print("Calculating x.")return5c ...
'__subclasshook__', '__init_subclass__', '__format__', '__sizeof__', '__dir__', '__class__'] """ 2. __setattr__:当我们执行obj.属性名=属性值或setattr(obj,属性名,属性值),即为属性赋值时被调用。 class Foo(object):
class Vehicle: def name(self, name): return name v = Vehicle() print(type(v).__name__) Run Code Output Vehicle Using attribute __name__ with type(), you can get the class name of an instance/object as shown in the example above. type() gives the class of object v and __nam...
class Student(object): __init__(self,name,score): # can't access directly self.__name=name # recommend not to access self._score=score get_name(self): return self.__name set_name(self,name): self.__name=name s=Student("John",59); s.__name="Mike" # -> AttributeError: 'Stud...
sys.getrefcount(object) 返回object的引用次数,通常高于期待值,因为包含了object作为参数传递给此方法的临时引用 sys.getrecursionlimit() python解释器堆栈当前设置的最大递归深度,可以通过setrecursionlimit()设置。 sys.getsizeof(object[, default]) 返回任意对象的字节大小。所有的内置对象都能返回正确的结果,但对于...
#NOTE:__init__()methodsNEVERhave areturnstatement.defvalue(self):#3"""The value (in knuts) of all the coins in this WizCoin object."""return(self.galleons*17*29)+(self.sickles*29)+(self.knuts)defweightInGrams(self):#4"""Returns the weight of the coins in grams."""return(self....
class A(object):"""模块中的自定义类A"""def __init__(self, name):self.name = name def get_name(self):"返回类的实例的名称"return self.name instance_of_a = A('一个实例')class B(A):"""这是类B 它继承自A类."""# 这个方法是B类独有的方法.def do_something(self):"""B类的实例...