new_contents: # This function is free of any dependencies.
  # source: https://github.com/mgd722/decode-google-maps-polyline
  def decode_polyline(polyline_str):
      '''Pass a Google Maps encoded polyline string; returns list of lat/lon pairs'''
      index, lat, lng = 0, 0, 0
      coordinates = []
      changes = {'latitude': 0, 'longitude': 0}
  
      # Coordinates have variable length when encoded, so just keep
      # track of whether we've hit the end of the string. In each
      # while loop iteration, a single coordinate is decoded.
      while index < len(polyline_str):
          # Gather lat/lon changes, store them in a dictionary to apply them later
          for unit in ['latitude', 'longitude']: 
              shift, result = 0, 0
  
              while True:
                  byte = ord(polyline_str[index]) - 63
                  index+=1
                  result |= (byte & 0x1f) << shift
                  shift += 5
                  if not byte >= 0x20:
                      break
  
              if (result & 1):
                  changes[unit] = ~(result >> 1)
              else:
                  changes[unit] = (result >> 1)
  
          lat += changes['latitude']
          lng += changes['longitude']
  
          coordinates.append((lat / 100000.0, lng / 100000.0))
  
      return coordinates
  
subject: Create polyline.py