[Solved] Looping in Python

You could put everything in a while loop which could repeat forever or until a user types a certain phrase.

import math
import sys
import os


print ("This program will calculate the area, height and perimeter of the Triangles: Scalene, Isosceles, Equilateral and a Right Angled Triangle.")
while True:


    # calculate the perimeter

    print ("Please enter each side for the perimeter of the triangle")

    a = float(input("Enter side a: "))
    b = float(input("Enter side b: "))
    c = float(input("Enter side c "))

    perimeter = (a + b + c)

    print ("The perimeter for this triangle is: " ,perimeter)


    # calculate the area

    print ("Please enter each side for the area of the triangle")

    a = float(input("Enter side a: "))
    b = float(input("Enter side b: "))
    c = float(input("Enter side c "))

    s = (a + b + c) / 2

    sp = (a + b + c) / 2
    area = (s*(s-a)*(s-b)*(s-c)) ** 0.5    #area = math.sqrt(sp*(sp - a)*(sp - b)*(sp - c))#

    print ("The area for this triangle is %0.2f: " %area)


    # calculate the height

    height = area / 2

    print ("The height of this triangle is: ", height)

or

while answer.lower() in ("yes", "y"):
    //code
    answer = input("Would you like to repeat?")

You could also put it all into a function def main(): and then do some form of recursion (calling a function in itself).

Those are just a few ways. There are a ton of ways you can get what you want.