Python pip batch update library script

import pip
from subprocess import call

for dist in pip.get_installed_distributions():
    print("check for " + dist.project_name)
    call("pip install --upgrade -i https://pypi.tuna.tsinghua.edu.cn/simple/ %s"%dist.project_name, shell=True)

#List all outdated libraries:

pip list --outdated

#Update library:

pip install --upgrade 库名