4-liner: clean with no import clear solution for Time Converter (24h to 12h) by przemyslaw.daniel - python coding challenges

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4-liner: clean with no import solution in Clear category for Time Converter (24h to 12h) by przemyslaw.daniel

def time_converter(str_time):
    hours, minutes = map(int, str_time.split(':'))
    am_or_pm = ['a.m.', 'p.m.'][hours >= 12]
    return f'{(hours-1) % 12+1}:{minutes:02} {am_or_pm}'

Aug. 25, 2018

Comments:

weirdname on Feb. 2, 2019, 1:26 a.m.
well amorpm took me a sec to think. nice formatting with minutes, but there is no need to convert mins into int.

mehanikm on Feb. 24, 2019, 10:42 p.m.
Wow that's really genius with that amorpm

kosarev.b on March 23, 2019, 11 a.m.
amorpm = ['a.m.', 'p.m.'][hours >= 12] it's very interesting solution. how does it work? what is name of it? can somebody give link to documentation about it?

Negamax on March 25, 2019, 6:41 p.m.
`['a.m.’, ‘p.m.’]` is a list with two items. `[hours >= 12]` is a condition `hours >= 12` inside square brackets. It can be True or False. Thus, we have `['a.m.’, ‘p.m.’][True]` or `['a.m.’, ‘p.m.’][False]`, depending of result `hours >= 12` condition. Then True is converting to `1`, False to the `0`. So, the `amorpm = ['a.m.’, ‘p.m.’][hours >= 12]` means: `amorpm = ['a.m.’, ‘p.m.’][0]` if the `hours` less than 12. `amorpm = ['a.m.’, ‘p.m.’][1]` if the `hours` equal or greater than 12.

fedeA on Sept. 8, 2019, 2:39 p.m.
Great solutions. It took me a while to understand amorpm = ['a.m.', 'p.m.'][hours >= 12] Brilliant! What is the purpose of using {minutes:02} instead of just {minutes}? Is this a format specifier?

przemyslaw.daniel on Sept. 9, 2019, 4:52 a.m.
<pre class='brush: python'>>>> minutes = 7; print(f"'{minutes:02}' '{minutes:2}' '{minutes}'") '07' ' 7' '7' </pre>

seleneyue on Sept. 30, 2019, 9:55 p.m.
Very clean and clear

pakicetus on Oct. 18, 2020, 1 p.m.
Great!

tkachuk.constantine on June 19, 2021, 10:53 a.m.
Cool. :)))) Thanks! I will use it amorpm = ['a.m.', 'p.m.'][hours >= 12]

Master of the Time Stone

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