写文件

import os
filename=raw_input('Enter file name:')
fobj=open(filename,'w')
while True:
    aLine=raw_input("Enter a Line ('.' to quit):")
    if aLine !=".":
        fobj.write('%s%s' %(aLine,os.linesep))        #linesep用于在文件中分隔行的字符串
    else:
        break
fobj.close()