文件操作

Posted 2020-11-09 梁梓蕙

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

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

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

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

classmates = [\'Michael\',\'Bob\',\'Tracy\']
#print(len(classmates))
#print(classmates[-1])

classmates.append(\'Rose\')
print(classmates)

classmates = [\'Michael\',\'Bob\',\'Tracy\']
#print(len(classmates))
#print(classmates[-1])

classmates.append(\'Rose\')
classmates.insert(1,\'Jack\')

classmates.pop()
print(classmates)

classmates = [\'Michael\',\'Bob\',\'Tracy\']
#print(len(classmates))
#print(classmates[-1])

classmates.append(\'Rose\')
classmates.insert(1,\'Jack\')

classmates.pop()
classmates.pop(0)
print(classmates)

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)

import turtle
turtle.speed(10)
colors = [\'red\', \'purple\', \'blue\', \'green\', \'yellow\', \'orange\']

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