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