#! /usr/bin/env 

from math import radians, cos, sin, asin, sqrt

# helper to calculate geographical distance using lat, lon
def get_distance(p1: tuple, p2: tuple):
    '''
    Returns a float that is the distance, in miles, between two (lat,lon) tuples.
        Parameters:
                p1 (tuple): point 1
                p2 (tuple): point 2
        Returns:
                distance (float): miles between points
    '''
    # The math module contains a function named
    # radians which converts from degrees to radians.
    p1 = (radians(p1[0]),radians(p1[1]))
    p2 = (radians(p2[0]),radians(p2[1]))
      
    # Haversine formula
    dlon = p2[1] - p1[1]
    dlat = p2[0] - p1[0]
    a = sin(dlat / 2)**2 + cos(p1[0]) * cos(p2[0]) * sin(dlon / 2)**2
 
    c = 2 * asin(sqrt(a))
    
    # Radius of earth in kilometers. Use 3956 for miles
    r = 3956
      
    # calculate the result
    return(c * r)