>>>isinstance (a,int) True>>>isinstance (a,str) False>>> isinstance (a,(str,int,list))#是元组中的一个返回 TrueTrue
TypeError:isinstance() arg2must be atypeortupleof types >>>isinstance(a,(str,int,list))#是元组中的一个 Traceback (most recent call last): File"<pyshell#120>", line1,in<module> isinstance(a,(str,int,list))#是元组中的一个 TypeError:isinstance() arg2must be atypeortupleof types >>...
isinstance() 实例 >>>a = 2 >>> isinstance (a,int) True >>> isinstance (a,str) False >>> isinstance (a,(str,int,list)) # 是元组中的一个返回 True True # isinstance()与type()的区别 class A: pass class B(A): pass isinstance(A(), A) # returns True type(A()) == A...
Example 2: Working of isinstance() with Native Types numbers = [1,2,3] result = isinstance(numbers, list) print(numbers,'instance of list?', result) result = isinstance(numbers, dict)print(numbers,'instance of dict?', result) result = isinstance(numbers, (dict, list))print(numbers,'ins...
Check if "Hello" is one of the types described in the type parameter: x =isinstance("Hello",(float,int,str,list,dict,tuple)) Try it Yourself » Example Check if y is an instance of myObj: classmyObj: name ="John" y = myObj() ...
isinstance() With Built-In Types As you know, Every value (variable) in Python has a type. In Python, we can use different built-in types such asint,float,list,tuple, strings,dictionary. Most of the time, you want to check the type of value to do some operations. In this case,isins...
Learn how to use type() and isinstance() in Python to check the type of an object and determine if it is an instance of a specific class.
函数isinstance()可以判断一个变量的类型,既可以用在Python内置的数据类型如str、list、dict,也可以用在我们自定义的类,它们本质上都是数据类型。 isinstance()用于判断数据类型 isinstance(x, str) 可以判断变量 x 是否是字符串; 代码语言:javascript 代码运行次数:0 ...
To check the data type, we can use the type() function, and to verify if the variable has a type of specific data type, we can use the isinstance() function. Using the isinstance function, we can check if the given variable is an int, float, list, tuple, str, set, dictionary, ...
importsys# 创建一个列表对象my_list=[1,2,3]# 创建别名another_list=my_list# 修改对象another_list.append(4)# 打印两个名称引用的对象print(my_list)# [1, 2, 3, 4]print(another_list)# [1, 2, 3, 4]# 查看对象的引用计数ref_count=sys.getrefcount(my_list)print(f"Reference count of my...