文件操作

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

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



import turtle

turtle.speed(20)
colors=[‘#B22222‘,‘#9A32CD‘,‘#32CD32‘,‘#00FFFF‘,‘#6B8E23‘,‘#4169E1‘]

for i in range(200):
    turtle.pencolor(colors[i% 6])
    turtle.forward(i)
    turtle.left(58)
turtle.done()


classmates = [‘Michael‘, ‘bob‘,‘tracy‘]
#print(len(classmates))
#print(classmates[-1])
(classmates).append(‘rose‘)
classmates.insert(1,‘jack‘)
classmates.pop()
classmates.pop(0)
classmates[0]=‘tom‘
print(classmates)