文件写入和读取

输入逐行保存

import os
filename = input(‘please enter file name:‘)
file = open(filename,‘w‘)
while True:
    aline = input(‘enter a line(q! 退出):‘)
    if aline != ‘q!‘:
        file.write(‘%s%s‘ %(aline,os.linesep))
    else:
        break
file.close()

逐行读取并打印出来

filename = input(‘please enter file name:‘)

f = open(filename,‘r‘)

alllines = f.readlines()
f.close
for eachlinse in alllines:
    print (eachlinse)