Dragon_Curve_with_Loops.py

import turtle 
ob=turtle.Turtle(); 
ob.speed(10000) 
ob.hideturtle() 
turtle.bgcolor("black") 
ob.pencolor("green") 
old=['f','l'] 
new=['f','l'] 
steps=[] 
k=0 
iterations=int(input("Iterations : ")) 
size=int(input("Size of lines : ")) 
while(k<iterations): 
 for i in range(0,len(old)-1): 
 if old[i]=='r': 
 old[i]='l' 
 elif old[i]=='l': 
 old[i]='r' 
 for i in range(0,len(old)//2): 
 t=old[i] 
 old[i]=old[len(old)-i-2] 
 old[len(old)-i-2]=t 
 for i in old: 
 new.append(i) 
 for i in old[:]: 
 old.remove(i) 
 for i in new: 
 old.append(i) 
 for i in steps[:]: 
 steps.remove(i) 
 for i in range(0,len(new)): 
 steps.append(new[i]) 
 k+=1 
for i in steps: 
 if i=='f': 
 ob.forward(size) 
 elif i=='r': 
 ob.right(90) 
 elif i=='l': 
 ob.left(90)