import subprocess

command = "pip list --outdated"

outdatelist  = subprocess.Popen (command, stdout=subprocess.PIPE,stderr=subprocess.PIPE, shell = True).stdout.readlines()
 
updatelist = [x.split("(")[0] for x in outdatelist ]


for x in updatelist:
    tempcmd = "pip install -U " + x
    print subprocess.Popen (tempcmd, stdout=subprocess.PIPE,stderr=subprocess.PIPE, shell = True).stdout.readlines()

print u"所有模块都已更新完毕！！"