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Python: id() function

id()

The id() function is used to get the identity of an object.

The identity is a unique integer for that object during its lifetime. This is also the address of the object in memory.

Version:

(Python 3.2.5)

Syntax:

id(object)

Parameter:

Name Description Required /
Optional
object An object, int, float, str,list, dict, tuple etc. Required

Example: Python id() function 

print('id of 6 =',id(6))

x = 5
print('id of x =',id(x))

y = x
print('id of y =',id(y))

z = 5.0
print('id of z =',id(z))

Output:

id of 6 = 10914528
id of x = 10914496
id of y = 10914496
id of z = 140486394610168

Pictorial Presentation:

Python: Built-in-function - id() function

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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