pipupgrade.py

# pip3(pip) install sh で　shをインストールしておく必要がある
from sh import pip3

package_list = [row.split()[0] for row in list(pip3('list', '-o', '--format=columns'))[2:]]
if len(package_list) == 0:
    print('All package are already up-to-date!')
else:
    if 'pip' in package_list:
        package_list.remove('pip')
        package_list.insert(0,'pip')
    for package in package_list:
        print('install --upgrade '+package)
        print(pip3('install', '--upgrade', package))