Python: Generate all the combinations with repetitions of k types of things taken n at a time
Python Itertools: Exercise-13 with Solution
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')]
Python Code Editor:
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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.
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Python: Tips of the Day
Inverts a dictionary with non-unique hashable values:
Example:
def tips_collect_dictionary(obj): inv_obj = {} for key, value in obj.items(): inv_obj.setdefault(value, list()).append(key) return inv_obj ages = { "Owen": 25, "Jhon": 25, "Pepe": 15, } print(tips_collect_dictionary(ages))
Output:
{25: ['Owen', 'Jhon'], 15: ['Pepe']}
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