City_distance.py

from math import *


def distance(coord1, coord2):
    """
    This uses the formula  'haversine' to calculate the great-circle distance b/w two points - that is the shortest distance over the earth surface.

    """

    lat1, long1 = coord1
    lat2, long2 = coord2
    R = 6371
    a = (sin((lat2 - lat1) / 2)) ** 2 + cos(lat1) * cos(lat2) * (
        sin((long2 - long1) / 2)
    ) ** 2
    c = 2 * (atan2(a ** 0.5, (1 - a) ** 0.5))
    d = R * c
    return d


if __name__ == "__main__":
    print("\n\nEnter  The co-ordinate of two cities : \n")
    latitude1, longitude1 = (
        float(x) for x in input("Enter Latitude and Longitude : ").split()
    )
    latitude2, longitude2 = (
        float(x) for x in input("Enter Latitude and Longitude : ").split()
    )

    dist = distance((latitude1, longitude1), (latitude2, longitude2))

    print("Choose your unit to display : ")
    print("The Distance between two cities : \n")
    print(
        "1. Kilometers\n2. Meters\n3. Miles\n4. Inches\n5. Foot\n6. Yard\n7. Light Year\n0. Exit"
    )
    ch = int(input("Enter your choice : "))
    if ch == 0:
        print("Thank You..!!")
        exit()
    elif ch == 1:
        pass
    elif ch == 2:
        pass
    elif ch == 3:
        pass
    elif ch == 4:
        pass
    elif ch == 5:
        pass
    elif ch == 6:
        pass
    elif ch == 7:
        pass
    else:
        print("Wrong Choice..!!")
        print("Try Again....")
    print(dist)