Python function to convert seconds into minutes, hours, and days

Question

Question: Write a program that asks the user to enter a number of seconds, and works as follows:

• There are 60 seconds in a minute. If the number of seconds

Answer 1

These functions are fairly compact and only use standard Python 2.6 and later.

def ddhhmmss(seconds):
    """Convert seconds to a time string "[[[DD:]HH:]MM:]SS".
    """
    dhms = ''
    for scale in 86400, 3600, 60:
        result, seconds = divmod(seconds, scale)
        if dhms != '' or result > 0:
            dhms += '{0:02d}:'.format(result)
    dhms += '{0:02d}'.format(seconds)
    return dhms


def seconds(dhms):
    """Convert a time string "[[[DD:]HH:]MM:]SS" to seconds.
    """
    components = [int(i) for i in dhms.split(':')]
    pad = 4 - len(components)
    if pad < 0:
        raise ValueError('Too many components to match [[[DD:]HH:]MM:]SS')
    components = [0] * pad + components
    return sum(i * j for i, j in zip((86400, 3600, 60, 1), components))

And here are tests to go with them. I'm using the pytest package as a simple way to test exceptions.

import ddhhmmss

import pytest


def test_ddhhmmss():
    assert ddhhmmss.ddhhmmss(0) == '00'
    assert ddhhmmss.ddhhmmss(2) == '02'
    assert ddhhmmss.ddhhmmss(12 * 60) == '12:00'
    assert ddhhmmss.ddhhmmss(3600) == '01:00:00'
    assert ddhhmmss.ddhhmmss(10 * 86400) == '10:00:00:00'
    assert ddhhmmss.ddhhmmss(86400 + 5 * 3600 + 30 * 60 + 1) == '01:05:30:01'
    assert ddhhmmss.ddhhmmss(365 * 86400) == '365:00:00:00'


def test_seconds():
    assert ddhhmmss.seconds('00') == 0
    assert ddhhmmss.seconds('02') == 2
    assert ddhhmmss.seconds('12:00') == 12 * 60
    assert ddhhmmss.seconds('01:00:00') == 3600
    assert ddhhmmss.seconds('1:0:0') == 3600
    assert ddhhmmss.seconds('3600') == 3600
    assert ddhhmmss.seconds('60:0') == 3600
    assert ddhhmmss.seconds('10:00:00:00') == 10 * 86400
    assert ddhhmmss.seconds('1:05:30:01') == 86400 + 5 * 3600 + 30 * 60 + 1
    assert ddhhmmss.seconds('365:00:00:00') == 365 * 86400


def test_seconds_raises():
    with pytest.raises(ValueError):
        ddhhmmss.seconds('')
    with pytest.raises(ValueError):
        ddhhmmss.seconds('foo')
    with pytest.raises(ValueError):
        ddhhmmss.seconds('1:00:00:00:00')