Python isinstance()方法
Python isinstance()函数如果对象是指定的类型，则返回真，如果不匹配，则返回假。
语法: isinstance(obj，class)
参数:
- obj : 需要作为类的一部分检查的对象。
- 类:类/类型/类或类型的元组，需要对照其检查对象。
返回: True，如果传递了单个类，则对象属于给定的类/类型；如果传递了类/类型的元组，则对象属于任何类/类型，否则返回 False。举起
类型错误:如果不是所提到的有效类类型。
Python 实例()示例
示例 1: Python 是一个带有 int 和 list 的实例
Python 3
# Python 3 code to demonstrate
# working of isinstance()
# with native types
# initializing native types
test_int = 5
test_list = [1, 2, 3]
# testing with isinstance
print("Is test_int integer? : " + str(isinstance(test_int, int)))
print("Is test_int string? : " + str(isinstance(test_int, str)))
print("Is test_list integer? : " + str(isinstance(test_list, int)))
print("Is test_list list? : " + str(isinstance(test_list, list)))
# testing with tuple
print("Is test_int integer or list or string? : "
+ str(isinstance(test_int, (list, int))))
输出:
Is test_int integer? : True
Is test_int string? : False
Is test_list integer? : False
Is test_list list? : True
Is test_int integer or list or string? : True
示例 2: 演示将 isinstance()用于对象
Python 3
# Python 3 code to demonstrate
# working of isinstance()
# with objects
# declaring classes
class gfg1:
a = 10
# inherited class
class gfg2(gfg1):
string = 'GeeksforGeeks'
# initializing objects
obj1 = gfg1()
obj2 = gfg2()
# checking instances
print("Is obj1 instance of gfg1? : " + str(isinstance(obj1, gfg1)))
print("Is obj2 instance of gfg2? : " + str(isinstance(obj2, gfg2)))
print("Is obj1 instance of gfg2? : " + str(isinstance(obj1, gfg2)))
# check inheritance case
# return true
print("Is obj2 instance of gfg1? : " + str(isinstance(obj2, gfg1)))
输出:
Is obj1 instance of gfg1? : True
Is obj2 instance of gfg2? : True
Is obj1 instance of gfg2? : False
Is obj2 instance of gfg1? : True
示例 3: Python 是一个实例数组
Python 3
test_list = [1, 2, 3]
print ("Is test_list list? : " + str(isinstance(test_list, list)))
输出:
Is test_list list? : True
示例 4: Python 是一个实例字符串
Python 3
test_str = "GeeksforGeeks"
print ("Is test_str string? : " + str(isinstance(test_str, str)))
输出:
Is test_str string? : True
示例 4: Python 是一个实例字典
Python 3
test_dict = {"apple" : 1, "Ball" : 2 }
print ("Is test_str dictionary? : " + str(isinstance(test_dict, dict)))
输出:
Is test_str dictionary? : True
示例 4: Python 是静态类方法
计算机编程语言
class geeks:
course = 'DSA'
def purchase(obj):
return obj.course
geeks.purchase = classmethod(geeks.purchase)
str(isinstance(geeks.purchase(), str ))
输出:
True
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