JSON+jq答案：

pip list -o --format json | jq '.[] | .name' | xargs pip install -U

以下一行可能会有所帮助：

（点数>20.00）

pip list--格式冻结--过时|sed的/=.*//g'| xargs-n1 pip install-U

旧版本：pip list--格式冻结--过时|sed的/（.*//g'| xargs-n1 pip install-U

如果发生错误，xargs-n1将继续运行。

如果您需要对省略的内容和引发错误的内容进行更多的“细粒度”控制，则不应添加-n1标志并明确定义要忽略的错误，方法是为每个单独的错误“管道化”以下行：

|sed的/^<错误的第一个字符>.*//'

下面是一个工作示例：

pip list --format freeze --outdated | sed 's/=.*//g' | sed 's/^<First characters of the first error>.*//' | sed 's/^<First characters of the second error>.*//' | xargs pip install -U

使用virtualenv时，如果您只想升级添加到virtualenv的软件包，您可能需要执行以下操作：

pip install `pip freeze -l | cut --fields=1 -d = -` --upgrade

以下Windows cmd代码段执行以下操作：

将pip升级到最新版本。升级所有过时的软件包。对于正在升级的每个包，检查requirements.txt中的任何版本说明符。

@echo off
Setlocal EnableDelayedExpansion
rem https://stackoverflow.com/questions/2720014/

echo Upgrading pip...
python -m pip install --upgrade pip
echo.

echo Upgrading packages...
set upgrade_count=0
pip list --outdated > pip-upgrade-outdated.txt
for /F "skip=2 tokens=1,3 delims= " %%i in (pip-upgrade-outdated.txt) do (
    echo ^>%%i
    set package=%%i
    set latest=%%j
    set requirements=!package!

    rem for each outdated package check for any version requirements:
    set dotest=1
    for /F %%r in (.\python\requirements.txt) do (
        if !dotest!==1 (
            call :substr "%%r" !package! _substr
            rem check if a given line refers to a package we are about to upgrade:
            if "%%r" NEQ !_substr! (
                rem check if the line contains more than just a package name:
                if "%%r" NEQ "!package!" (
                    rem set requirements to the contents of the line:
                    echo requirements: %%r, latest: !latest!
                    set requirements=%%r
                )
                rem stop testing after the first instance found,
                rem prevents from mistakenly matching "py" with "pylint", "numpy" etc.
                rem requirements.txt must be structured with shorter names going first
                set dotest=0
            )
        )
    )
    rem pip install !requirements!
    pip install --upgrade !requirements!
    set /a "upgrade_count+=1"
    echo.
)

if !upgrade_count!==0 (
    echo All packages are up to date.
) else (
    type pip-upgrade-outdated.txt
)

if "%1" neq "-silent" (
    echo.
    set /p temp="> Press Enter to exit..."
)
exit /b


:substr
rem string substition done in a separate subroutine -
rem allows expand both variables in the substring syntax.
rem replaces str_search with an empty string.
rem returns the result in the 3rd parameter, passed by reference from the caller.
set str_source=%1
set str_search=%2
set str_result=!str_source:%str_search%=!
set "%~3=!str_result!"
rem echo !str_source!, !str_search!, !str_result!
exit /b

这里发布的所有解决方案都打破了依赖关系。

在此对话中，将功能直接包含到pip中，包括正确管理依赖关系：

的作者https://github.com/kdeldycke/meta-package-manager写入MPM可以模拟缺少的upgrade all命令：

mpm --pip upgrade --all

要在默认python版本中升级所有pip默认包，只需在终端或命令提示符中运行底部python代码：

import subprocess
import re


pkg_list = subprocess.getoutput('pip freeze')

pkg_list = pkg_list.split('\n')


new_pkg = []
for i in pkg_list:
    re.findall(r"^(.*)==.*", str(i))
    new = re.findall(r"^(.*)==.*", str(i))[0]
    new_pkg.append(new)

for i in new_pkg:
    print(subprocess.getoutput('pip install '+str(i)+' --upgrade'))