Python: Itertools module

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The itertools module provides functions for creating and working with iterators. It includes infinite iterators (such as count, cycle, and repeat), finite iterators (such as accumulate, chain, compress), and combinatorial iterators (such as product, permutations, and combinations).

Example:

import itertools

for i in itertools.count(5, 5):
  if i > 20:
    break
  print(i)  # Output: 5, 10, 15, 20