How to add two maps of hours and minutes and add them in python

Question

So I have two dicts of time durations:

a = {hours: 13, minutes: 23}
b = {hours: 23, minutes: 42}

and I want to add them together so the final output would be:

{hours: 37, minutes: 5}

Is there any python built in library that can help me do this or do I have to write my own function?

It's approximately 3 lines of code. It would be quicker to write it than to search for a library. The `datetime` module can do delta addition, but you'd have to convert to their format. — Tim Roberts, Dec 15 '21 at 19:01

DarkKnight · Answer 1 · 2021-12-15T19:39:12.797

2

The dictionary keys must be hashable so let's make them strings. Then, break it down into simple steps:

a = {'hours': 13, 'minutes': 23}
b = {'hours': 23, 'minutes': 42}

def add_times(a, b):
    m = a['minutes'] + b['minutes']
    h = (0 if m < 60 else 1) + a['hours'] + b['hours']
    return {'hours': h, 'minutes': m % 60}

print(add_times(a, b))

Output:

{'hours': 37, 'minutes': 5}

edited Dec 15 '21 at 19:39

answered Dec 15 '21 at 19:15

DarkKnight

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@Mandera oops. Thank you. Edited – DarkKnight Dec 15 '21 at 19:39

chepner · Accepted Answer · 2021-12-15T20:01:16.540

Converting the dict values to datetime.timedelta values is trivial, after which you can easily add them.

>>> from datetime import timedelta
>>> timedelta(**a) + timedelta(**b)
datetime.timedelta(days=1, seconds=47100)

Converting the sum back to a dict is not so trivial, but still easy.

>>> x = timedelta(**a) + timedelta(**b)
>>> dict(zip(("hours", "minutes"), divmod(int(x.total_seconds())//60, 60)))
{'hours': 37, 'minutes': 5}

Converting the total number of seconds into minutes
Convert the minutes into hours and minutes
Zip with the strings "hours" and "minutes" to create a sequence of tuples suitable for passing to dict.

score 1 · Answer 3 · answered Dec 15 '21 at 19:25

Here's a solution that first sums together all time dicts and then moves over any extra hours from the minutes value.

def sum_times(*time_dicts):
    summed = {key: sum(d[key] for d in time_dicts) for key in time_dicts[0]}
    summed["hours"] += summed["minutes"] // 60
    summed["minutes"] %= 60
    return summed

With your example

a = {"hours": 13, "minutes": 23}
b = {"hours": 23, "minutes": 42}

print(sum_times(a, b))

{'hours': 37, 'minutes': 5}

How to add two maps of hours and minutes and add them in python

3 Answers3