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def fibonacci(n):
result = 0
if n == 1:
result = 1
elif n == 2:
result = 2
else:
result = fibonacci(n - 2) + fibonacci(n - 1)
return result
a = 1
b = 1
c = a + b
s = 0
while b < 4000000:
s += c
a = b + c
b = c + a
c = a + b
print (s)
import turtle
def koch(t, x):
if x < 5:
t.fd(x)
else:
l = x / 3
koch(t, l)
t.lt(60)
koch(t, l)
t.rt(120)
koch(t, l)
t.lt(60)
koch(t, l)
length = float(input("请输入曲线长度:"))
bob = turtle.Turtle()
bob.pu()
bob.bk(length / 2)
bob.pd()
bob.speed(0)
koch(bob, length)
turtle.mainloop()
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