Distance Calculator

distance_calculator.py

import math

def distance_calculator(points):
    """ Takes an ordered list of points (tuple), and returns the total path distance.
    
    >>> points = [(-7,-3), (6,1), (4, 10), (2, -5), (-8, 5), (8, 3)]
    >>> distance = distance_calculator(points)
    >>> distance = round(distance, 2)
    68.22
    """
    
    distance = 0
    
    for i, point in enumerate(points):
        if not index_in_list(points, i+1):
            break
        next_point = points[i+1]
        seg_dist = segment_distance(point, next_point)
        distance = distance + seg_dist
        
    return distance

def segment_distance(a, b):
    """Calculate the distance between a and b."""
    
    horizontal_distance = b[0] - a[0]
    vertical_distance = b[1] - a[1]
    h = horizontal_distance ** 2
    v = vertical_distance ** 2
    distance = math.sqrt(h+v)
    
    return distance

def index_in_list(a_list, index):
    return (index < len(a_list))