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Python issubclass()

The isinstance() function returns true if the first argument of the function is a subclass of the second argument. Actually, we can say that this function is used to check the given class is a subclass of the other class.

issubclass(class, classinfo)  #where class specify the class name

bytes() Parameters:

Takes 2 parameters. We can also pass a tuple of classes as the classinfo argument, in that case, the function will return True if the class is a subclass of any of the classes in the tuple.

Parameter Description Required / Optional
class class to be checked Required
classinfo class, type, or tuple of classes and types Required

bytes() Return Value

It returns a boolean value either true or false.

Input Return Value
a class is a subclass true
a class is not a subclass false
In any other case TypeError exception

Examples of issubclass() method in Python

Example 1: How issubclass() works?

class Polygon:
  def __init__(polygonType):
    print('Polygon is a ', polygonType)

class Triangle(Polygon):
  def __init__(self):

print(issubclass(Triangle, Polygon))
print(issubclass(Triangle, list))
print(issubclass(Triangle, (list, Polygon)))
print(issubclass(Polygon, (list, Polygon)))



Example 2: checks the subclass of the built-in classes

print('bool is the subclass of int: ', issubclass(bool, int))
print('float is the subclass of int: ', issubclass(float, int))
print('str is the subclass of list: ', issubclass(str, list))

import collections
print('collections.OrderedDict is the subclass of dict: ', issubclass(collections.OrderedDict, dict))


bool is the subclass of int: True
float is the subclass of int: False
str is vsubclass of list: False
collections.OrderedDict is the subclass of dict: True 

Example 3: issubclass() method use a tuple to specify multiple classinfo names

print(issubclass(bool, (int, str, list)))
print(issubclass(float, (int, str, list))