munter.py

   1 #! /usr/bin/env python
   2
   3 # Munter Time Calculation
   4 #
   5 # Rudimentary program written by ALV to implement the Munter time calculation
   6
   7 import sys
   8 import argparse
   9
  10 class InvalidUnitsException(Exception):
  11     pass
  12
  13 rates = {
  14     'uphill': 4,
  15     'flat': 6, # or downhill on foot
  16     'downhill': 10,
  17     'bushwhacking': 2
  18 }
  19
  20 unit_choices = ['metric', 'imperial']
  21 travel_mode_choices = rates.keys()
  22
  23 def munter(distance, elevation, rate='flat', units='metric'):
  24     if units not in unit_choices:
  25         raise InvalidUnitsException
  26
  27     if 'imperial' == units:
  28         # convert to metric
  29         distance = (distance * 1.609) # mi to km
  30         elevation = (elevation * .305) # ft to m
  31
  32     time = (distance + (elevation / 100.0)) / rates[rate]
  33
  34     return time
  35
  36 def main():
  37     parser = argparse.ArgumentParser(description='Munter Time Calculation')
  38
  39     parser.add_argument('--distance', '-d', type=float, required=True,
  40         help='Distance (in km, by default)')
  41     parser.add_argument('--elevation', '-e', type=float, required=True,
  42         help='Elevation change (in m, by default)')
  43     parser.add_argument('--travel-mode', '-t', type=str,
  44         default='uphill', choices=travel_mode_choices, required=False,
  45         help='Travel mode (flat, by default)')
  46     parser.add_argument('--units', '-u', type=str, default='metric',
  47         required=False,
  48         choices=unit_choices,
  49         help='Units of input values')
  50     opts = parser.parse_args()
  51
  52     distance = opts.distance
  53     elevation = opts.elevation
  54     units = opts.units
  55     travel_mode = opts.travel_mode
  56
  57     print("Estimated Time (in hours) = %8.2f"
  58         % munter(distance, elevation, travel_mode, units=units))
  59
  60 if __name__ == "__main__":
  61     main()