用python执行shell脚本，奇数分钟执行

from datetime import date, datetime, timedelta
from time import clock as now
import commands
import decimal
import urllib2
import json
import datetime
import time

min = time.strftime('%M', time.localtime())
m = int(min)
command_start = "test"
command_stop = "stop"
if m % 2 == 0:
    a, b = commands.getstatusoutput(command_start)
    print 'start ', a
else:
    a, b = commands.getstatusoutput(command_stop)
    print 'stop ', a