文件操作，列表实例NiceHexSpiral

fr = open('letter.txt.txt', mode='r', encoding='utf-8')

 

plaincode = fr.read()
print('明文:' + plaincode)

print('密文:', end='')
for c in plaincode:
    print(chr(ord(c)+3),end='')

明文:一小时后行动。
密文:＂七尒旹向衏劫々

　　

fr = open('letter.txt.txt', mode='r', encoding='utf-8')
plaincode = fr.read()
fr.close()

fw = open('c_letter.txt.txt', mode='a', encoding='utf-8')
for c in plaincode:
    fw.write(chr(ord(c)+3))
fw.close()

＂七尒旹向衏劫々

fr = open('c_letter.txt.txt', mode='r', encoding='utf-8')
plaincode = fr.read()
fr.close()

fw = open('letter.txt.txt', mode='a', encoding='utf-8')
for c in plaincode:
    fw.write(chr(ord(c)-3))
fw.close()

一小时后行动。一小时后行动。

import turtle
turtle.speed(10)
colors = ['#FF00FF','#EE9A00','#CD0000    ','#AEEEEE','#98FB98','#388E8E']

for i in range(100):
    turtle.pencolor(colors[i% 6])
    turtle.forward(i)
    turtle.left(59)
turtle.done()