Vast Nectarine

import turtle

rules = {
    "A": "A-B--B+A++AA+B-",
    "B": "+A-BB--B-A++A+B",
    '+': '+',
    '-': '-'
}

axiom = ['A']

level = 5

for i in range(level):
    p = []
    for j in range(len(axiom)):
        s = list(rules[axiom[j]])
        p.extend(s)
    axiom = p

print(axiom)
t = turtle.Turtle()

for l in axiom:
    if l in ['A', 'B']:
        t.forward(10)
    elif l == '+':
        t.left(60)
    elif l == '-':
        t.right(60)