gistfile1.py

def strToNum(string):
    if '/' in string:
        num, den = string.split('/')
        return int(num)/int(den)
    elif '.' in string:
        return float(string)
    else: return int(string)

run = 1
while run:
    coords = []
    for x in range(2):
        coords.append(input("coord {}: ".format(x+1)).split())

    for pair in coords:
        for value in pair:
            value = strToNum(value)
        print(pair)
    
    x1, y1 = coords[0][0], coords[0][1]
    x2, y2 = coords[-1][0], coords[-1][1]

    delta_y = y2 - y1
    delta_x = x2 - x1
    
    print()
    print("∆y = {} - {} = {}".format(y2, y1, delta_y))
    print("∆x = {} - {} = {}".format(x2, x1, delta_x))
    print("m = {}/{} ≈ {}".format(delta_y, delta_x, delta_y/delta_x))
    print()
    if input("Another? (y/n): ") is not 'y':
        run = 0