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Comprehensions & generators

List/dict/set comprehensions, generator expressions, and lazy iteration.

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Comprehensions & generators easy

How to Generate Combinations with Replacement in Python

Generate all r-length combinations with repetition from a list using the standard library itertools.combinations_with_replacement function.

itertools combinations generator
Python 
from itertools import combinations_with_replacement

items = ['A', 'B', 'C']
r = 2

combos = list(combinations_with_replacement(items, r))

for combo in combos:
    print(combo)

if __name__ == "__main__":
    print(f"Total combinations with replacement: {len(combos)}")
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