我在pip问题讨论中找到的最简单、最快的解决方案是：

pip install pipdate
pipdate

资料来源：https://github.com/pypa/pip/issues/3819

在蝙蝠脚本中

call pip freeze > requirements.txt
call powershell "(Get-Content requirements.txt) | ForEach-Object { $_ -replace '==', '>=' } | Set-Content requirements.txt"
call pip install -r requirements.txt --upgrade

您可以使用以下Python代码。与pip冻结不同，这不会打印警告和FIXME错误。对于管道<10.0.1

import pip
from subprocess import call

packages = [dist.project_name for dist in pip.get_installed_distributions()]
call("pip install --upgrade " + ' '.join(packages), shell=True)

对于pip>=10.0.1

import pkg_resources
from subprocess import call

packages = [dist.project_name for dist in pkg_resources.working_set]
call("pip install --upgrade " + ' '.join(packages), shell=True)

pip list --outdated --format=freeze | grep -v '^\-e' | cut -d = -f 1  | xargs -n1 pip install -U

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

改用pipx：

pipx upgrade-all