Python: Generate all the combinations with repetitions of k types of things taken n at a time

Last update on March 29 2025 13:02:37 (UTC/GMT +8 hours)

13. Color Combinations with Repetition

Write a Python program that will select a specified number of colours from three different colours, and then generate all the combinations with repetitions.

Sample Solution:

Python Code:

from itertools import combinations_with_replacement
 
def combinations_colors(l, n):
    return combinations_with_replacement(l,n)
l = ["Red","Green","Blue"]
print("Original List: ",l)
n=1
print("\nn = 1")
print(list(combinations_colors(l, n)))
n=2
print("\nn = 2")
print(list(combinations_colors(l, n)))
n=3
print("\nn = 3")
print(list(combinations_colors(l, n)))

Sample Output:

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

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

n = 2
[('Red', 'Red'), ('Red', 'Green'), ('Red', 'Blue'), ('Green', 'Green'), ('Green', 'Blue'), ('Blue', 'Blue')]

n = 3
[('Red', 'Red', 'Red'), ('Red', 'Red', 'Green'), ('Red', 'Red', 'Blue'), ('Red', 'Green', 'Green'), ('Red', 'Green', 'Blue'), ('Red', 'Blue', 'Blue'), ('Green', 'Green', 'Green'), ('Green', 'Green', 'Blue'), ('Green', 'Blue', 'Blue'), ('Blue', 'Blue', 'Blue')]

For more Practice: Solve these Related Problems:

• Write a Python program to select a specified number of colors from three different options and generate all possible combinations with repetition allowed.
• Write a Python program to create an iterator that produces combinations of colors with repetition and then filters combinations that have adjacent identical colors.
• Write a Python program to generate repeated combinations from three color sets and then map a function to sort each combination alphabetically.
• Write a Python program to compute all combinations with repetition from three colors and then remove combinations that do not meet a given pattern.

Python Code Editor:

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

Previous: Write a Python program to create Cartesian product of two or more given lists using itertools.
Next: Write a Python program generate permutations of specified elements, drawn from specified values.