Need to create option for km or mi using Tkinter and Python

Question

So below I have a code that I found and modified for calculating the distance between two locations. I am creating a GUI for simple user input. Everything is working as expected but it would be a bonus if I could accomplish two things.

1. Have a toggle or selection that would allow me to show the distance in either KM or Mi

2. is there any way that I could round the output so it doesn't have so many digits after the decimal?

I assume it has to be some type of a variable based on the object selection?

# import modules 
from tkinter import *
from geopy.geocoders import Nominatim 
from geopy import distance 

# user defined funtion 
def get_dis(): 
  try: 
      
      geolocator = Nominatim(user_agent="geoapiExercises") 
      
      place1 = geolocator.geocode(str(e1.get())) 
      place2 = geolocator.geocode(str(e2.get())) 


      Loc1_lat,Loc1_lon = (place1.latitude),(place1.longitude) 
      Loc2_lat,Loc2_lon = (place2.latitude),(place2.longitude) 

      location1=(Loc1_lat,Loc1_lon) 
      location2=(Loc2_lat,Loc2_lon) 

      res = (str(distance.distance(location1, location2).mi)+" Mi") 

      result.set(res) 
  except: 
      result.set("someting went wrong") 

# object of tkinter 
# with background set to light grey 
master = Tk() 
master.configure(bg='light grey') 
master.title("Find Distance") 

# Variable Classes in tkinter 
result = StringVar(); 


# Creating label for each information 
# name using widget Label 
Label(master, text="Start Location : " , bg = "light grey").grid(row=1, sticky=W) 
Label(master, text="End Location : " , bg = "light grey").grid(row=2, sticky=W) 

Label(master, text="Result :", bg = "light grey").grid(row=3, sticky=W) 

# Creating label for class variable 
# name using widget Entry 
Label(master, text="", textvariable=result,bg = "light grey").grid(row=3,column=1, sticky=W) 


e1 = Entry(master,width = 50) 
e1.grid(row=1, column=1) 
e2 = Entry(master,width = 50) 
e2.grid(row=2, column=1) 

# creating a button using the widget 
b = Button(master, text="Check", command=get_dis, bg = "white") 
b.grid(row=1, column=2,columnspan=2, rowspan=2,padx=5, pady=5,) 

mainloop()

edit with notes.. cant get to round

import modules from tkinter import * from geopy.geocoders import Nominatim from geopy import distance

user defined funtion def get_dis():

try: 
      
    geolocator = Nominatim(user_agent="geoapiExercises") 
      
    place1 = geolocator.geocode(str(e1.get())) 
    place2 = geolocator.geocode(str(e2.get())) 


    Loc1_lat,Loc1_lon = (place1.latitude),(place1.longitude) 
    Loc2_lat,Loc2_lon = (place2.latitude),(place2.longitude) 

    location1=(Loc1_lat,Loc1_lon) 
    location2=(Loc2_lat,Loc2_lon) 

    res = (str(distance.distance(location1, location2) .km)+" Km") 

    result.set(res) 
except: 
    result.set("someting went wrong") 

def get_dis():

    if unit.get() == 'mi':
        res = str(round(distance.distance(location1, location2).mi, 2))+" Mi"
    else:
        res = str(round(distance.distance(location1, location2).km, 2))+" km"   

object of tkinter

with background set to light grey master = Tk() master.configure(bg='light grey') master.title("Find Distance")

Variable Classes in tkinter result = StringVar(); Label(master, text="", textvariable=result,bg = "light grey").grid(row=4,column=1,

sticky=W)

Creating label for each information

name using widget Label Label(master, text="Start Location : " , bg = "light grey").grid(row=1, sticky=W) Label(master, text="End

Location : " , bg = "light grey").grid(row=2, sticky=W)
Label(master, text="Distance :", bg = "light grey").grid(row=3, sticky=W)

Creating label for class variable

name using widget Entry Label(master, text="Unit :", bg="light gray").grid(row=3, sticky=W) Label(master, text="Result :", bg =

"light grey").grid(row=4, sticky=W) e1 = Entry(master,width = 50) e1.grid(row=1, column=1) e2 = Entry(master,width = 50) e2.grid(row=2, column=1)

f1 = Frame(master) f1.grid(row=3, column=1, sticky=W) unit = StringVar(value="mi") Radiobutton(f1, text="miles", value="mi", variable=unit, bg="light gray").pack(side="left") Radiobutton(f1, text="km", value="km", variable=unit, bg="light gray").pack(side="left")

creating a button using the widget b = Button(master, text="Calculate", command=get_dis, bg = "white") b.grid(row=1,

column=2,columnspan=2, rowspan=2,padx=5, pady=5,) mainloop()

Answer 1

First add two radiobuttons before result row:

Label(master, text="Unit :", bg="light gray").grid(row=3, sticky=W)
Label(master, text="Result :", bg = "light grey").grid(row=4, sticky=W) # changed to row 4
...
f1 = Frame(master)
f1.grid(row=3, column=1, sticky=W)
unit = StringVar(value="mi")
Radiobutton(f1, text="miles", value="mi", variable=unit, bg="light gray").pack(side="left")
Radiobutton(f1, text="km", value="km", variable=unit, bg="light gray").pack(side="left")

result = StringVar(); 
Label(master, text="", textvariable=result,bg = "light grey").grid(row=4,column=1, sticky=W) # changed to row 4

Then call the corresponding function based on the unit selected inside get_dis():

def get_dis():
    try:
        ...
        if unit.get() == 'mi':
            res = str(round(distance.distance(location1, location2).mi, 3))+" Mi"
        else:
            res = str(round(distance.distance(location1, location2).km, 3))+" km"
    ...

Note that round(..., 3) is used to round the result to have 3 digits after the decimal.

Answer 2

# import modules 
from tkinter import *
from geopy.geocoders import Nominatim 
from geopy import distance 
  
# user defined funtion 
def get_dis(): 
     
          
    geolocator = Nominatim(user_agent="geoapiExercises") 
        
    place1 = geolocator.geocode(str(e1.get())) 
    place2 = geolocator.geocode(str(e2.get())) 


    Loc1_lat,Loc1_lon = (place1.latitude),(place1.longitude) 
    Loc2_lat,Loc2_lon = (place2.latitude),(place2.longitude) 

    location1=(Loc1_lat,Loc1_lon) 
    location2=(Loc2_lat,Loc2_lon) 

    res = (str(distance.distance(location1, location2) .km)+" Km") 

    if unit.get() == 'mi':
        res = str(round(distance.distance(location1, location2).mi, 2))+" Mi"
    else:
        res = str(round(distance.distance(location1, location2).km, 2))+" km"

    result.set(res) 
  
# object of tkinter 
# with background set to light grey 
master = Tk() 
master.configure(bg='light grey') 
master.title("Find Distance") 
  
# Variable Classes in tkinter 
result = StringVar(); 
Label(master, text="", textvariable=result,bg = "light grey").grid(row=4,column=1, sticky=W)  
  
# Creating label for each information 
# name using widget Label  
Label(master, text="Start Location : " , bg = "light grey").grid(row=1, sticky=W) 
Label(master, text="End Location : " , bg = "light grey").grid(row=2, sticky=W) 
  
  
# Creating label for class variable 
# name using widget Entry 
Label(master, text="Unit :", bg="light gray").grid(row=3, sticky=W)
Label(master, text="Result :", bg = "light grey").grid(row=4, sticky=W) 
  
  
e1 = Entry(master,width = 50) 
e1.grid(row=1, column=1) 
e2 = Entry(master,width = 50) 
e2.grid(row=2, column=1) 

f1 = Frame(master)
f1.grid(row=3, column=1, sticky=W)
unit = StringVar(value="mi")
Radiobutton(f1, text="miles", value="mi", variable=unit, bg="light gray").pack(side="left")
Radiobutton(f1, text="km", value="km", variable=unit, bg="light gray").pack(side="left")

# creating a button using the widget   
b = Button(master, text="Calculate", command=get_dis, bg = "white") 
b.grid(row=1, column=2,columnspan=2, rowspan=2,padx=5, pady=5,) 
  
mainloop() 

Answer 3

Since we are already getting the distance in one of the units with the check button..let's use that. We will convert it's result to the other. Changed Check to Distance in miles, Added a new button for KM. Create a function to convert miles to km. Then a function to call both functions.Two. This will get distance in miles(get_dis) and convert to KM(km_mi). The result will have no decimals. I used int. If you want decimals you can use round as suggested in the other answer.

from tkinter import *
from geopy.geocoders import Nominatim
from geopy import distance


# user defined function
def get_dis():
    try:
        global res
        geolocator = Nominatim(user_agent="geoapiExercises")

        place1 = geolocator.geocode(str(e1.get()))
        place2 = geolocator.geocode(str(e2.get()))

        Loc1_lat, Loc1_lon = (place1.latitude), (place1.longitude)
        Loc2_lat, Loc2_lon = (place2.latitude), (place2.longitude)

        location1 = (Loc1_lat, Loc1_lon)
        location2 = (Loc2_lat, Loc2_lon)
        res = int(distance.distance(location1, location2).mi)
        return result.set(res)


    except Exception as e:
        print(e)

def km_mki():
    miles = res
    conv_fac = 1.609  # conversion factor
    # calculating how many kilometers
    kilometers = miles * conv_fac
    return result.set(int(kilometers))
def two():
    get_dis()
    km_mki()


# object of tkinter
# with background set to light grey
master = Tk()
master.configure(bg='light grey')
master.title("Find Distance")

# Variable Classes in tkinter
result = StringVar()

# Creating label for each information
# name using widget Label
Label(master, text="Start Location : ", bg="light grey").grid(row=1, sticky=W)
Label(master, text="End Location : ", bg="light grey").grid(row=2, sticky=W)

Label(master, text="Result :", bg="light grey").grid(row=3, sticky=W)

# Creating label for class variable
# name using widget Entry
Label(master, text="", textvariable=result, bg="light grey").grid(row=3, column=1, sticky=W)

e1 = Entry(master, width=50)
e1.grid(row=1, column=1)
e2 = Entry(master, width=50)
e2.grid(row=2, column=1)

# creating a button using the widget
b = Button(master, text="Get distance in Miles", command=get_dis, bg="white")
b.grid(row=1, column=2, columnspan=2, rowspan=2, padx=5, pady=5, )
b1 = Button(master, text="Get distance in Km", command=two, bg="white")
b1.grid(row=3, column=2, columnspan=2, rowspan=3, padx=5, pady=5, )

mainloop()