Utilisation et exemple de isinstance() en Python

Python built-in functions

La fonction instanceof() vérifie si l'objet (premier paramètre) est une instance ou une sous-classe de la classe classinfo (second paramètre).

La syntaxe instanceof() est :

isinstance(object, classinfo)

Paramètres instanceof()

isinstance() a deux paramètres :

• object- Object à vérifier

• classinfo -Classe, type ou tuple

Valeur renvoyée par isinstance()

isinstance() renvoie :

• True siobjectEst une instance de classe ou une sous-classe, ou un élément de n'importe quel tuple

• False besides

IfclassinfoIf it is not a type or tuple type, it will raise a TypeError exception.

Instance1How does isinstance() work?

class Foo:
　　a =　5
　　
fooInstance = Foo()
print(isinstance(fooInstance, Foo))
print(isinstance(fooInstance, (list, tuple)))
print(isinstance(fooInstance, (list, tuple, Foo)))

When running this program, the output is:

True
False
True

Instance2Use instanceof() with local types

numbers = [1,　2,　3]
result = isinstance(numbers, list)
print(numbers, 'Is it a list instance?', result)
result = isinstance(numbers, dict)
print(numbers, 'Is it a dict instance?', result)
result = isinstance(numbers, (dict, list))
print(numbers, 'Is it a dict or list instance?', result)
number =　5
result = isinstance(number, list)
print(number, 'Is it a list instance?', result)
result = isinstance(number, int)
print(number, 'Is it an int instance?', result)

When running this program, the output is:

[1,　2,　3Is it a list instance? True
[1,　2,　3Is it a dict instance? False
[1,　2,　3Is it a dict or list instance? True
5　Is it a list instance? False
5　Is it an int instance? True

Python built-in functions