utils.py

#!/usr/bin/python3

# Utility functions
import geopy.distance
import statistics
import pprint

def calculateGPSdistance(location1, location2):
  distanceInFeet = geopy.distance.distance(location1, location2).feet
  return distanceInFeet

# The normal Python list sorting functions are behaving strangely. I think because the list is a complex type.
# So, we're going back to basics and doing a recursive sort here.
def sortSegments(listToSort):
  if len(listToSort) == 1:
    return listToSort

  shortestSegmentIndex = 0
  try:
    for idx, [time, points] in listToSort:
      if time < listToSort[shortestSegmentIndex][0]:
        shortestSegmentIndex = idx
  except ValueError:
    pprint.pprint(listToSort)
    
  savePoints = listToSort[shortestSegmentIndex][1]
  del listToSort[shortestSegmentIndex]
  saveItem = [time, savePoints]
  return [saveItem].append(sortSegments(listToSort))

def averageFilter(times):
  if type(times) == type(int):
    return times
  if len(times) == 0:
    return 0
  floatList = [float(x) for x in times]
  return sum(floatList)/len(floatList)

# We use statistics.pstdev() here because we're calculating the stdev 
# of the entire series, we're not working ith just a sample of lap times, 
# we're working with all the lap times.
def stdDevFilter(times):
  if len(times) == 0:
    return 0
  floatList = [float(x) for x in times]
  return statistics.pstdev(floatList)

if __name__ == '__main__':
  print("This file should not be called directly.")