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Infinite generator - Cycle and Sum

Robin Michael

Jun 26, 2024 • 1 min read

Working through a python example and presented with the problem

Write a one-line Python generator or iterator expression that returns the infinite sequence of increasing integers generated by repeatedly adding the ascii values of each letter in the word “Close” to itself. 67, 175, 286, 401, 502, 569, 677, 788, 903 is the beginning of this sequence. Assume any needed Python standard library modules are already imported.

I came up with this, which is

Take each letter in the word Close
Find the ordinal value of that letter i.e. C = 67
Cycle over the values as a generator using itertools.cycle
Then accumulate the values as another iterator adding each value itertools.accumulate

Code

import itertools
import operator
import time

if __name__ == '__main__':
    my_gen = (itertools.accumulate(itertools.cycle((ord(letter) for letter in 'Close'))))
    for current_value in itertools.islice(my_gen, 12):
        print(current_value)

Results

Code

Results

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