Use:

pip install -r <(pip freeze) --upgrade

Use:

import pip
pkgs = [p.key for p in pip.get_installed_distributions()]
for pkg in pkgs:
    pip.main(['install', '--upgrade', pkg])

甚至：

import pip
commands = ['install', '--upgrade']
pkgs = commands.extend([p.key for p in pip.get_installed_distributions()])
pip.main(commands)

它的工作速度很快，因为它不会不断发射炮弹。

改用pipx：

pipx upgrade-all

在查阅Rob van der Woude的for优秀文档后，Windows版本：

for /F "delims===" %i in ('pip freeze') do pip install --upgrade %i

import os
import pip
from subprocess import call, check_call

pip_check_list = ['pip', 'pip3']
pip_list = []
FNULL = open(os.devnull, 'w')


for s_pip in pip_check_list:
    try:
        check_call([s_pip, '-h'], stdout=FNULL)
        pip_list.append(s_pip)
    except FileNotFoundError:
        pass


for dist in pip.get_installed_distributions():
    for pip in pip_list:
        call("{0} install --upgrade ".format(pip) + dist.project_name, shell=True)

我接受了拉玛纳的回答，并使其变得友好。

从…起https://github.com/cakebread/yolk:

$ pip install -U `yolk -U | awk '{print $1}' | uniq`

然而，你需要先得到蛋黄：

$ sudo pip install -U yolk