Created distance calculation.

main/distance.py

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+#! /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)