from urllib.request import urlopen
from tkinter import Tk, Entry, Label, Button, messagebox, Frame, BOTTOM, END

class Tour:
def __init__(self, origin, destination):
   """Function that takes the origin city and destination city as parameters."""
   self.origin = origin
   self.destination = destination

def distance(self, mode="driving"):
   """This function takes mode as a parameter and returns distance between cities for the indicated mode"""

   # we need to replace all spaces and commas by plus signs in order to obtain valid url
   origin = self.origin.replace(" ", "+").replace(",","")
   destination = self.destination.replace(" ", "+").replace(",","")
   key = "AIzaSyBWTc_7D9RgSQbJvbeTjdt54Fcv8kdeD-w"
   url = "https://maps.googleapis.com/maps/api/distancematrix/json?origins=" + origin + "&" + "destinations=" + destination + "&mode=" + mode + "&sensor=false&key=" + key

   # use urllib function urlopen in order to get data from the web
   with urlopen(url) as response:
         html_content = str(response.read())
   # result is returned as a single string
   # we'll remove all newlines and spaces from the string
   html_content = html_content.replace(" ", "")
   html_content = html_content.replace("\\n", "")

   """ after striping first two characters and the last one we obtain the string that has a form of ordinary
   python dictionary so we can use python function eval to obtain dictionary"""
   html_content = html_content[2:][:-1]

   # if the response does not contain a distance, ValueError should be raised
   try:
         html_content_dict = eval(html_content)
         self.value = html_content_dict["rows"][0]["elements"][0]["distance"]["value"] # path to distance value

Python coding project - Supermarket Interface Objectives â€¢Pra...