put [start_watching]*2 into els clear solution for Lightbulb Start Watching by tokyoamado - python coding challenges

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put [start_watching]*2 into els solution in Clear category for Lightbulb Start Watching by tokyoamado

from datetime import datetime
from typing import List, Optional

def sum_light(els: List[datetime], start_watching: Optional[datetime] = None) -> int:
    st = start_watching if start_watching else els[0]
    els_ = sorted(els + [st] * 2)
    return sum((b - a).total_seconds() for a, b in zip(*[iter(els_)] * 2) if b > st)

Nov. 18, 2020

Comments:

kudinov.feodor on May 31, 2021, 9:50 a.m.
Liked this part: st = startwatching if startwatching else els[0] rather weird logic with lists multiplications. I would suggest to simplify that to add more clarity Also I would suggest to test against test case ``` <h1>test if start watching is before light is on</h1> <pre class='brush: python'>assert sum_light([ datetime(2015, 1, 12, 10, 0, 0), datetime(2015, 1, 12, 10, 10, 10), datetime(2015, 1, 12, 11, 0, 0), datetime(2015, 1, 12, 11, 10, 10), ], datetime(2015, 1, 12, 9, 0, 0)) == 1220 </pre> ```

kudinov.feodor on May 31, 2021, 9:59 a.m.
Liked this part: st = startwatching if startwatching else els[0] rather weird logic with lists multiplications. I would suggest to simplify that to add more clarity I do not get why "for a, b in zip(*[iter(els_)] * 2)" a and b are not equal

kudinov.feodor on May 31, 2021, 10:25 a.m.
I am back, I got it, you copy link to iterator so zip can call next 2 times for each loop, Raised score, but still I believe teammates would suffer from such implicit logic, reading your code )

tokyoamado on June 2, 2021, 8:03 a.m.
<pre class='brush: python'>zip(*[iter(some_list)] * n) </pre> This is a snippet to split some_list into n-sized chunks I found years ago. As you said, it is not a readable code, I think, too. For code readability, I should use yield or list-comprehension instead. However I think it is the fastest so I usually use it.

Master of the Time Stone

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