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Python: Generate the unique combinations

Python Itertools: Exercise-27 with Solution

Write a Python program to chose specified number of colours from three different colours and generate the unique combinations

Sample Solution:

Python Code:

from itertools import combinations 
def unique_combinations_colors(list_data, n):
    return [" and ".join(items) for items in combinations(list_data, r=n)]
colors = ["Red","Green","Blue"]
print("Original List: ",colors)
n=1
print("\nn = 1")
print(list(unique_combinations_colors(colors, n)))
n=2
print("\nn = 2")
print(list(unique_combinations_colors(colors, n)))
n=3
print("\nn = 3")
print(list(unique_combinations_colors(colors, n)))

Sample Output:

Original List:  ['Red', 'Green', 'Blue']

n = 1
['Red', 'Green', 'Blue']

n = 2
['Red and Green', 'Red and Blue', 'Green and Blue']

n = 3
['Red and Green and Blue']

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