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Python: isinstance() function

isinstance() function

The isinstance() function returns true if the object argument is an instance of the classinfo argument, or of a subclass thereof.
If object is not an object of the given type, the function always returns false. If classinfo is a tuple of type objects return true if object is an instance of any of the types.
If classinfo is not a type or tuple of types and such tuples, a TypeError exception is raised.

Version:

(Python 3.2.5)

Syntax:

isinstance(object, classinfo)

Parameter:

Name Description Required /
Optional
object An object. Required
classinfo

A type or a class, or a tuple of types and/or classes.

 Optional

Example: Python isinstance() function 

num = [2, 4, 6]

x = isinstance(num, list)
print(num,'Instance of list?', x)

x = isinstance(num, dict)
print(num,'Instance of dict?', x)

x = isinstance(num, (dict, list))
print(num,'Instance of dict or list?', x)

number = 7

x = isinstance(num, list)
print(num,'Instance of list?', x)

x = isinstance(num, int)
print(num,'Instance of int?', x)

Output:

[2, 4, 6] instance of list? True
[2, 4, 6] instance of dict? False
[2, 4, 6] instance of dict or list? True
[2, 4, 6] instance of list? True
[2, 4, 6] instance of int? False

Python Code Editor:

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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