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Challenge 77: Duration Formatter

curriculum/challenges/english/blocks/daily-coding-challenges-python/68d30845cc08266018fc46bd.md

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--description--

Given an integer number of seconds, return a string representing the same duration in the format "H:MM:SS", where "H" is the number of hours, "MM" is the number of minutes, and "SS" is the number of seconds. Return the time using the following rules:

  • Seconds: Should always be two digits.
  • Minutes: Should omit leading zeros when they aren't needed. Use "0" if the duration is less than one minute.
  • Hours: Should be included only if they're greater than zero.

--hints--

format(500) should return "8:20".

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(format(500), "8:20")`)
}})

format(4000) should return "1:06:40".

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(format(4000), "1:06:40")`)
}})

format(1) should return "0:01".

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(format(1), "0:01")`)
}})

format(5555) should return "1:32:35".

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(format(5555), "1:32:35")`)
}})

format(99999) should return "27:46:39".

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(format(99999), "27:46:39")`)
}})

--seed--

--seed-contents--

py
def format(seconds):

    return seconds

--solutions--

py
def format(seconds):
    h = seconds // 3600
    m = (seconds % 3600) // 60
    s = seconds % 60

    seconds_str = f"{s:02d}"
    minutes_str = str(m)

    if h > 0:
        hours_str = str(h)
        return f"{hours_str}:{minutes_str.zfill(2)}:{seconds_str}"
    else:
        return f"{minutes_str}:{seconds_str}"