我怎么能用Python和乌龟画一个漂亮的螺旋呢？

Question

我有一个作业要用python和turtle画一个螺旋（从内到外），但是我想不出一个方法来做，除了我所做的，它需要这样：

我试过那样做，但效果不好。在

import turtle

turtle.shape ('turtle')


d = 20  #Distance

a = 1   #StartingAngle
x = 200    #Num of loops 

for i in range (x):
turtle.left(a)
turtle.forward(d)
a = a + 5

Answer 1

import turtle
from math import sin,cos,pi

t=turtle.Turtle()
t.speed(0)

n=50 #number of spirals
d=10 #distance between 2 spirals
r=0  #radius
x,y = 0, 0

cur_r = r
for i in range(n):
    for a in range(1,360, 4):
        r = cur_r + d*a/360.0
        a *= pi/180.0
        y = r*sin(a)
        x = r*cos(a)
        turtle.goto(x,y)
    cur_r += d