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Python: Generates all possible permutations of n different objects

Python Itertools: Exercise-15 with Solution

Write a Python program to generate all possible permutations of n different objects.

Sample Solution:

Python Code:

import itertools
def permutations_all(l):
    for values in itertools.permutations(l):
        print(values)

permutations_all([1])
print("\n")
permutations_all([1,2])
print("\n")
permutations_all([1,2,3])

Sample Output:

(1,)


(1, 2)
(2, 1)


(1, 2, 3)
(1, 3, 2)
(2, 1, 3)
(2, 3, 1)
(3, 1, 2)
(3, 2, 1)

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