Python issubclass() Function

The Python issubclass() function is used to check whether the specified class is a subclass (derived class) of the another specified class or not. It returns true when the specified specified class is a subclass (derived class) of the another specified class, else returns false.

Syntax

issubclass(class, classinfo)

Parameters

Example:

In the example below, issubclass() function is used to check the class called rectangle is a subclass of class called polygon or not.

class polygon:
  def __init__(self, length, breadth):
    self.length = length
    self.breadth = breadth

class rectangle(polygon):
  pass

x = issubclass(rectangle, polygon)
print(x)

The output of the above code will be:

True

Example:

Instead of specifying one class or type, a tuple of types or classes can be used. In the example below, issubclass() function is used to check the class called rectangle is a subclass of any of the classes present in the given tuple or not.

class polygon:
  def __init__(self, length, breadth):
    self.length = length
    self.breadth = breadth

class rectangle(polygon):
  pass

x = issubclass(rectangle, (list, tuple, set))
print(x)

x = issubclass(rectangle, (list, tuple, set, polygon))
print(x)

The output of the above code will be:

False
True