Python isinstance() function is used to check if an object is an instance of the specified class or not.

Python的isinstance（）函数用于检查对象是否为指定类的实例。

Python isinstance（） (Python isinstance())

Python isinstance() function syntax is:

Python的isinstance（）函数语法为：

isinstance(object, classinfo)

This function returns True if the object is instance of classinfo argument or instance of classinfo subclass.

如果对象是classinfo参数的实例或classinfo子类的实例，则此函数返回True 。

If the object is not an instance of classinfo or its subclass, then the function returns False.

如果对象不是classinfo或其子类的实例，则该函数返回False 。

classinfo argument can be a of . In that case, isinstance() will return True if the object is an instance of any of the types.

classinfo参数可以是的 。 在这种情况下，如果对象是任何类型的实例，则isinstance（）将返回True。

If classinfo is not a type or tuple of types, a TypeError exception is raised.

如果classinfo不是类型或类型的元组，则会引发TypeError异常。

Python isinstance（）示例 (Python isinstance() example)

Let’s look at some simple examples of isinstance() function with built-in , such as , tuple, , , etc.

让我们看一下具有内置的isinstance（）函数的一些简单示例，例如 ，元组， ， ， 等。

Python isinstance（）编号 (Python isinstance() number)

i = 10print('i is int:', isinstance(i, int))f = 10.5print('f is float:', isinstance(f, float))

Output:

输出：

i is int: Truef is float: True

Python isinstance（）字符串 (Python isinstance() string)

s = 'a'print('s is str:', isinstance(s, str))

Output:

输出：

s is str: True

Python isinstance（）字节 (Python isinstance() bytes)

b = bytes('abc', 'utf-8')print('b is bytes:', isinstance(b, bytes))

Output:

输出：

b is bytes: True

Python isinstance（）元组 (Python isinstance() tuple)

t = (1, 2)print('t is tuple:', isinstance(t, tuple))

Output:

输出：

t is tuple: True

Python isinstance（）列表 (Python isinstance() list)

li = []print('li is list:', isinstance(li, list))

Output:

输出：

li is list: True

Python isinstance（）字典 (Python isinstance() dict)

d = {}print('d is dict:', isinstance(d, dict))

Output:

输出：

d is dict: True

Python isinstance（）类和继承 (Python isinstance() class and inheritance)

Let’s look at an example of isinstance() function with custom class and with multiple classes.

我们来看一个带有自定义类和多个类的isinstance（）函数的示例。

class Person:    name = ''class Employee(Person):    id = 0p = Person()e = Employee()print('p isinstance of Person:', isinstance(p, Person))print('p isinstance of Employee:', isinstance(p, Employee))print('e isinstance of Person:', isinstance(e, Person))print('e isinstance of Employee:', isinstance(e, Employee))

Output:

输出：

p isinstance of Person: Truep isinstance of Employee: Falsee isinstance of Person: Truee isinstance of Employee: True

Python isinstance（）类的元组 (Python isinstance() tuple of classes)

print('p is an instance of Person or Employee:', isinstance(p, (Person, Employee)))print('e is an instance of Person or Employee:', isinstance(e, (Person, Employee)))

Output:

输出：

p is an instance of Person or Employee: Truee is an instance of Person or Employee: True

摘要 (Summary)

Python isinstance() is a utility function to check if an object is of a specific type or not. We can use it to perform a type check and perform operations based on the type of object.

Python isinstance（）是一种实用程序函数，用于检查对象是否为特定类型。 我们可以使用它来执行类型检查并根据对象的类型执行操作。

Reference:

参考：

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