pip 更新库

来自：http://www.cnblogs.com/luckjun/p/4958338.html

---

pip:

python

import pip

from subprocess import call

for dist in pip.get_installed_distributions():

    call("sudo pip install --upgrade "+dist.project_name, shell=True)

pip3:

python3

import pip

from subprocess import call

for dist in pip.get_installed_distributions():

    call("sudo pip3 install --upgrade "+dist.project_name, shell=True)