Poping from sorted list clear solution for Sort Except Zero by erykcoapl - python coding challenges

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Poping from sorted list solution in Clear category for Sort Except Zero by erykcoapl

from typing import Iterable

def except_zero(items: list) -> Iterable:
    srt = sorted(filter(None, items), reverse=True)
    return (it and srt.pop() for it in items)

March 22, 2021

Comments:

Tsibulnikov on April 2, 2021, 1:52 p.m.
Really beautiful solution. Can you please explain the idea with reversing the list without zeros. And what does this construction mean ? <pre class='brush: python'>it and srt.pop() </pre>

erykcoapl on April 2, 2021, 3:58 p.m.
Hi. Thanks for your reply. "and" operator returns the first operand that resolves the statement. For example: "10 and 0" is 0; "None and 0" is None. In the solution I store the sorted list without zeroes in reversed order. Thanks to this if I pop an element from it the result is the next nonzero element. So to sum up: I iterate over items, if an item (named "it") evaluates to False the "it" is returned form the generator, if "it" evaluates to True the second part of "and" is executed and the next nonzero item is poped.

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