Usage and examples of Python issubclass()

Python built-in functions

The issubclass() function checks whether the parameter (the first parameter object) is a subclass of the classinfo class (the second parameter).

The syntax of issubclass():

issubclass(object, classinfo)

issubclass() parameters

issubclass() has two parameters:

• object -The class to be checked

• classinfo-Class, type, or class and type of tuple

The return value of issubclass():

The return value of issubclass():

• True ifobjectis a subclass of the class, or any element of the tuple

• False except

Example: How does issubclass() work?

class Polygon:
　　def __init__(polygonType):
　　　　print('The polygon is ', polygonType)
class Triangle(Polygon):
　　def __init__(self):
　　　　Polygon.__init__('triangle')
　　　　
print(issubclass(Triangle, Polygon))
print(issubclass(Triangle, list))
print(issubclass(Triangle, (list, Polygon)))
print(issubclass(Polygon, (list, Polygon)))

When running the program, the output is:

True
False
True
True

It is important to note that classes are considered to be their own subclasses.

Python built-in functions