Python script to compute your average pace-per-mile from a total distance and a total time. See script for usage

running-pace.py

#!/usr/bin/python
# Given a distance and time, computes your pace-per-mile:
#   <distance in mi> - Total milage, in a format like `3.1` or `0.25`
#   <time> - Total time. Allowed formats are `M:SS` or `H:MM:SS`

import sys

if len(sys.argv) == 1:
    print 'Usage: <distance in mi> <time>'
    sys.exit()

distance = sys.argv[1]

total_time = sys.argv[2]
if total_time.count(':') == 2:
    hours, minutes, seconds = total_time.split(':')
else:
    hours = 0
    minutes, seconds = total_time.split(':')

total_seconds = (int(hours) * 3600) + (int(minutes) * 60) + int(seconds)
seconds_per_mile = float(total_seconds) / float(distance)

minutes_per_mile = int(seconds_per_mile / 60)
seconds_remainder = int(seconds_per_mile - (minutes_per_mile * 60))
print 'Avg. Pace of {}:{:0=2d}'.format(minutes_per_mile, seconds_remainder)