print 输出到指定文件中，文件名加上当天日期

import sys
import datetime

def printMessagetoFile():
    c="string  print to file \n"
    return c

def addMessagetoFile():
    c="add a string to print to file \n"
    return c

if __name__=="__main__":
    today = datetime.date.today()
    c=printMessagetoFile()
    b=addMessagetoFile()
    f=open("out"+str(today)+".txt",'w')
    print >>f,c
    for i in range(1,21):
        print i
        print >>f,i
    print >>f,b
    f.close()
  

注意>>f后面要加逗号，否则会出错