Ttykuu

I did a project in Python where I combined user-input, random, and the turtle module to make a sort of "Mandala Generator", or a program that can generate a simple design either randomly or by the specifications of users. Is there any way I can shorten my code without drastically changing it?

#custom mandala project Python
import turtle
import random
import time

#is the game in progress?
drawing = False

#define turtle
pen = turtle.Turtle()
pen.setheading(90)
pen.pensize(3)
pen.speed(12)

#colors empty list
colors = []

#define variables
LINE1, LINE2 = "~" * 36, "~" * 24

#define check input function
def get_input(response, values):
 #make sure the input is in the choices
 while True:
 value = input(response).strip().lower()
 if value in values:
 return value

#define main function
def main():
 print(LINE1 + "nCustom Mandala Generatorn" + LINE1)
 name = input("What is your name? ")
 print("In this custom mandala generator, you get to choose the size and colors of your mandala, or have the computer generate a random one,", name, ".n" + LINE2)
 time.sleep(1)
 ready = input("Are you ready or not? ")

 if ready[0].lower() == "y":
 answer = get_input("Would you like to use our random generator function or our custom function? random/custom ", "random", "custom")

 #universal variables
 size = random.uniform(1.5, 2.5)
 fd = 75 * size

 if answer == "random":
 colors.extend(("darkred", "red", "yellow", "darkgreen", "green", "lightgreen", "darkblue", "blue", "purple"))
 #rt = right turn
 rt = random.uniform(100, 300)

 elif answer == "custom":
 print(LINE2 + "nYou can choose any colors from this list for your Mandala: nDarkred, red, yellow, darkgreen, green, lightgreen, darkblue, blue, purple")
 color1 = get_input("What is the first color? ", "darkred", "red", "yellow", "darkgreen", "green", "lightgreen", "darkblue", "blue", "purple")
 color2 = get_input("What is the second color? ", "darkred", "red", "yellow", "darkgreen", "green", "lightgreen", "darkblue", "blue", "purple")
 colors.extend((color1, color2))
 rt = int(input("What angle would you like your Mandala to turn at? "))

 #pre-draw sequence
 print(LINE2 + "nInitializing...")
 print("Determining features... nColor... nSize...")
 time.sleep(3)
 print(LINE1 + "nYour final result should be drawing as of this point!nThanks for using the generator,", name, "!")

 for counter in range(50):
 selection = random.choice(colors)
 pen.color(selection)
 pen.forward(fd)
 pen.right(rt)

 else:
 print("Come and use the custom generator later!")


main()