Python: Permutations of specified elements, drawn from specified values

Last update on May 28 2022 13:00:30 (UTC/GMT +8 hours)

Python Itertools: Exercise-14 with Solution

Write a Python program generate permutations of specified elements, drawn from specified values.

Sample Solution:

Python Code:

from itertools import product 

def permutations_colors(inp, n):
    for x in product(inp, repeat=n):
        c = ''.join(x)
        print(c,end=', ')

str1 = "Red"
print("Original String: ",str1)
print("Permutations of specified elements, drawn from specified values:")
n=1
print("\nn = 1")
permutations_colors(str1,n)
n=2
print("\nn = 2")
permutations_colors(str1,n)
n=3
print("\nn = 3")
permutations_colors(str1,n)

lst1 = ["Red","Green","Black"]
print("\n\nOriginal list: ",lst1)
print("Permutations of specified elements, drawn from specified values:")
n=1
print("\nn = 1")
permutations_colors(lst1,n)
n=2
print("\nn = 2")
permutations_colors(lst1,n)
n=3
print("\nn = 3")
permutations_colors(lst1,n)

Sample Output:

Original String:  Red
Permutations of specified elements, drawn from specified values:

n = 1
R, e, d, 
n = 2
RR, Re, Rd, eR, ee, ed, dR, de, dd, 
n = 3
RRR, RRe, RRd, ReR, Ree, Red, RdR, Rde, Rdd, eRR, eRe, eRd, eeR, eee, eed, edR, ede, edd, dRR, dRe, dRd, deR, dee, ded, ddR, dde, ddd, 

Original list:  ['Red', 'Green', 'Black']
Permutations of specified elements, drawn from specified values:

n = 1
Red, Green, Black, 
n = 2
RedRed, RedGreen, RedBlack, GreenRed, GreenGreen, GreenBlack, BlackRed, BlackGreen, BlackBlack, 
n = 3
RedRedRed, RedRedGreen, RedRedBlack, RedGreenRed, RedGreenGreen, RedGreenBlack, RedBlackRed, RedBlackGreen, RedBlackBlack, GreenRedRed, GreenRedGreen, GreenRedBlack, GreenGreenRed, GreenGreenGreen, GreenGreenBlack, GreenBlackRed, GreenBlackGreen, GreenBlackBlack, BlackRedRed, BlackRedGreen, BlackRedBlack, BlackGreenRed, BlackGreenGreen, BlackGreenBlack, BlackBlackRed, BlackBlackGreen, BlackBlackBlack,

Python Code Editor:

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Previous: Write a Python program to chose specified number of colours from three different colours and generate all the combinations with repetitions.
Next: Write a Python program to generate all possible permutations of n different objects.

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