文件操作，列表实例NiceHexSpiral

fr = open('jay.txt',mode='r',encoding='utf-8')
jay = fr.read()
print('明文：'+jay)
print('密文：',end='')
fr.close()

fw = open('hannah.txt',mode='a',encoding='utf-8')
for c in jay:
     print(chr(ord(c)+3),end='')
fw.close()

import turtle
turtle.speed(10)
colors = ['#B0E2FF','blue','yellow','pink','green','orange']

for i in range(200):
    turtle.pencolor(colors[i%6])
    turtle.forward(i)
    turtle.left(59)
turtle.done()