文件操作

fr = open('salah.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='')

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


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

import turtle
colors=['yellow','red','black','blue','purple','orange']
turtle.speed(10)
for i in range(100):
    turtle.pencolor(colors[i%6])
    turtle.forward(i)
    turtle.left(59)

turtle.done()