Please note, this is a STATIC archive of website www.w3resource.com from 19 Jul 2022, cach3.com does not collect or store any user information, there is no "phishing" involved.
w3resource

Python: issubclass() function

issubclass() function

The issubclass() function returns true if the specified object is a subclass of the specified object, otherwise false. A class is considered a subclass of itself.

Version:

(Python 3.2.5)

Syntax:

issubclass(class, classinfo)

Parameter:

Name Description Required /
Optional
class An object to be checked. Required
classinfo classinfo may be a tuple of class objects, in which case every entry in classinfo will be checked. In any other case, a TypeError exception is raised. Required

Example: Python issubclass() function

class Square:
  def __init__(SquareType):
    print('Square is a ', SquareType)

class Rectangle(Square):
  def __init__(self):
    Square.__init__('Rectangle')
    
print(issubclass(Rectangle, Square))
print(issubclass(Rectangle, list))
print(issubclass(Rectangle, (list, Square)))
print(issubclass(Square, (list, Square)))

Output:

True
False
True
True

Python Code Editor:

Previous: isinstance()
Next: iter()

Test your Python skills with w3resource's quiz



Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

  • The os and os.path modules.
  • The __file__ constant
  • os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
  • os.path.dirname(path) (returns "the directory name of pathname path")
  • os.getcwd() (returns "a string representing the current working directory")
  • os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m