blocks|key|2238580|text|Python2.x和Python3.x是不同的。如果您想下载Python+2的更新版本，只需下载并安装新版本即可。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2238581|如果您想安装Python+3，可以分别安装Python+3，然后将Python2.x的路径更改为Control中的Python3.x>所有控制面板项>+System+>>+Environment变量。|2238582|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Python 2.x and Python 3.x are different. If you would like to download a newer version of Python 2, you could just download and install the newer version.

If you want to install Python 3, you could install Python 3 separately then change the path for Python 2.x to Python 3.x in Control Panel > All Control Panel Items > System > Advanced System Settings > Environment Variables.

blocks|key|2238624|text|Python的每一个次要版本，即任何3.x和2.x版本，都将与计算机上的其他版本并行安装。只有补丁版本才能升级现有的安装。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2238625|因此，如果您希望保持已安装的Python2.7，只需让它使用安装程序安装一个新版本即可。如果您想摆脱Python2.7，可以在安装更新版本之前或之后卸载它--这没有什么区别。|2238626|当前的Python3安装伴随着py.exe启动程序，默认情况下它被安装到系统目录中。这使得它可以从路径中获得，因此只需使用py而不是python作为命令，就可以从任何shell自动运行它。这避免了您必须自己将当前的Python安装放到路径中。这样，您就可以很容易地同时安装多个Python，而不会相互干扰。运行时，只需使用py+script.py而不是python+script.py来使用启动程序。您还可以指定使用py+-3或py+-3.6来启动特定版本的版本，否则启动程序将使用当前的默认值(通常是最新的3.x)。|offset|length|style|CODE|2238627|使用启动程序，还可以运行Python+2脚本(这些脚本的语法通常与Python+3不兼容)，如果您决定继续安装Python2.7。只需使用py+-2+script.py启动脚本即可。|2238628|至于PyPI包，每个都有自己的文件夹，其中安装了模块。因此，如果您安装了一个新版本，并且希望使用您为前一个版本安装的模块，则必须首先为新版本安装它们。安装程序的当前版本也为您提供了安装pip的机会；默认情况下，它是启用的，因此您已经为每个安装提供了pip。但是，除非您显式地将Python安装添加到路径中，否则不能只使用pip。幸运的是，您还可以简单地使用py.exe启动程序：py+-m+pip运行pip。例如，要为Python3.6安装BeautifulSoupforPython3.6，您可以运行py+-3.6+-m+pip+install+beautifulsoup4。|2238629|entityMap^0|0|0|F|6|1P|2|1U|6|4H|C|4W|G|5S|5|5Y|7|0|1X|F|0|2K|3|3G|3|4G|3|4Y|6|59|9|5K|3|6Z|11|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@$F|S|G|T|H|I]|$F|U|G|V|H|I]|$F|W|G|X|H|I]|$F|Y|G|Z|H|I]|$F|10|G|11|H|I]|$F|12|G|13|H|I]|$F|14|G|15|H|I]]|9|@]|A|$]]|$1|J|3|K|5|6|7|16|8|@$F|17|G|18|H|I]]|9|@]|A|$]]|$1|L|3|M|5|6|7|19|8|@$F|1A|G|1B|H|I]|$F|1C|G|1D|H|I]|$F|1E|G|1F|H|I]|$F|1G|G|1H|H|I]|$F|1I|G|1J|H|I]|$F|1K|G|1L|H|I]|$F|1M|G|1N|H|I]]|9|@]|A|$]]|$1|N|3|-4|5|6|7|1O|8|@]|9|@]|A|$]]]|O|$]]

Every minor version of Python, that is any 3.x and 2.x version, will install side-by-side with other versions on your computer. Only patch versions will upgrade existing installations.

So if you want to keep your installed Python 2.7 around, then just let it and install a new version using the installer. If you want to get rid of Python 2.7, you can uninstall it before or after installing a newer version—there is no difference to this.

Current Python 3 installations come with the <code>py.exe</code> launcher, which by default is installed into the system directory. This makes it available from the PATH, so you can automatically run it from any shell just by using <code>py</code> instead of <code>python</code> as the command. This avoids you having to put the current Python installation into PATH yourself. That way, you can easily have multiple Python installations side-by-side without them interfering with each other. When running, just use <code>py script.py</code> instead of <code>python script.py</code> to use the launcher. You can also specify a version using for example <code>py -3</code> or <code>py -3.6</code> to launch a specific version, otherwise the launcher will use the current default (which will usually be the latest 3.x).

Using the launcher, you can also run Python 2 scripts (which are often syntax incompatible to Python 3), if you decide to keep your Python 2.7 installation. Just use <code>py -2 script.py</code> to launch a script.

<hr>

As for PyPI packages, every Python installation comes with its own folder where modules are installed into. So if you install a new version and you want to use modules you installed for a previous version, you will have to install them first for the new version. Current versions of the installer also offer you to install <code>pip</code>; it’s enabled by default, so you already have <code>pip</code> for every installation. Unless you explicitly add a Python installation to the PATH, you cannot just use <code>pip</code> though. Luckily, you can also simply use the <code>py.exe</code> launcher for this: <code>py -m pip</code> runs <code>pip</code>. So for example to install Beautiful Soup for Python 3.6, you could run <code>py -3.6 -m pip install beautifulsoup4</code>.

blocks|key|2238669|text|在2019年，您可以使用巧克力味进行安装。打开cmd或powershell，键入：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2238670|choco+install+python|code-block|syntax|javascript|2238671|entityMap|0|LINK|mutability|MUTABLE|url|https://chocolatey.org/^0|C|4|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

In 2019, you can install using <a href="https://chocolatey.org/" rel="nofollow noreferrer">chocolatey</a>. Open your cmd or powershell, type:
<pre><code>choco install python
</code></pre>

blocks|key|908026|text|如果要将任何3.x.y升级到3.x.z+(补丁)+Python版本，只需转到Python下载页面获取最新版本并启动安装即可。因为您已经在计算机上安装了Python，所以安装程序将提示您“立即升级”。单击该按钮，它将用一个新版本替换现有版本。安装后还必须重新启动计算机。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|908027|​|908028|📷|atomic|908029|908030|如果您正在从3.x升级到3.y+(次要)，那么您将被提示使用“立即安装”。在本例中，您不是在升级，而是在安装Python的新版本。您可以在您的计算机上安装多个版本。它们将位于不同的目录中。当计算机上有多个Python版本时，需要使用皮兰彻启动特定版本的Python。|908031|例如：|908032|py+-3.7|blockquote|908033|或|908034|皮-3.8|908035|确保您的计算机上安装了py发射器。如果您使用windows安装程序的默认设置，它将自动安装。如果您单击安装窗口上的“自定义安装”链接，则始终可以检查它。|908036|如果您的计算机上安装了多个Python版本，并且有一个项目正在使用虚拟环境(例如(+venv+)+)使用早期版本的Python，则可以使用以下方式升级Python：|908037|python升级“您的虚拟环境路径”|908038|例如，我的./venv虚拟环境中有Python3.7，我希望将venv升级到Python3.8，我将执行以下操作|908039|python+-m+venv+--升级./venv|908040|entityMap|0|LINK|mutability|MUTABLE|url|https://www.python.org/downloads/|1|IMAGE|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/1110b2c840cb3fb9ac977fc0545be52e.png|imageAlt|2|https://docs.python.org/3/using/windows.html#launcher|3^0|12|A|0|0|0|0|1|1|0|0|38|3|2|0|0|0|0|0|B|5|3|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1L|8|@]|9|@$A|1M|B|1N|1|1O]]|C|$]]|$1|D|3|E|5|6|7|1P|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|1Q|8|@]|9|@$A|1R|B|1S|1|1T]]|C|$]]|$1|I|3|E|5|6|7|1U|8|@]|9|@]|C|$]]|$1|J|3|K|5|6|7|1V|8|@]|9|@$A|1W|B|1X|1|1Y]]|C|$]]|$1|L|3|M|5|6|7|1Z|8|@]|9|@]|C|$]]|$1|N|3|O|5|P|7|20|8|@]|9|@]|C|$]]|$1|Q|3|R|5|6|7|21|8|@]|9|@]|C|$]]|$1|S|3|T|5|P|7|22|8|@]|9|@]|C|$]]|$1|U|3|V|5|6|7|23|8|@]|9|@$A|24|B|25|1|26]]|C|$]]|$1|W|3|X|5|6|7|27|8|@]|9|@]|C|$]]|$1|Y|3|Z|5|P|7|28|8|@]|9|@]|C|$]]|$1|10|3|11|5|6|7|29|8|@]|9|@]|C|$]]|$1|12|3|13|5|P|7|2A|8|@]|9|@]|C|$]]|$1|14|3|-4|5|6|7|2B|8|@]|9|@]|C|$]]]|15|$16|$5|17|18|19|C|$1A|1B]]|1C|$5|1D|18|1E|C|$1F|1G|1H|-4]]|1I|$5|17|18|19|C|$1A|1J]]|1K|$5|17|18|19|C|$1A|1J]]]]

If you are upgrading any 3.x.y to 3.x.z (patch) Python version, just go to <a href="https://www.python.org/downloads/" rel="noreferrer">Python downloads page</a> get the latest version and start the installation. Since you already have Python installed on your machine installer will prompt you for "Upgrade Now". Click on that button and it will replace the existing version with a new one. You also will have to restart a computer after installation.

<a href="https://i.stack.imgur.com/NpAw5.png" rel="noreferrer"><img src="https://i.stack.imgur.com/NpAw5.png" alt="enter image description here"></a>

If you are upgrading from 3.x to 3.y (minor) then you will be prompted with "Install Now". In this case, you are not upgrading, but you are installing a new version of Python. You can have more than one version installed on your machine. They will be located in different directories. When you have more than one Python version on your machine you will need to use <a href="https://docs.python.org/3/using/windows.html#launcher" rel="noreferrer">py lanucher</a> to launch a specific version of Python.

For instance:

<blockquote>
 py -3.7
</blockquote>

or 

<blockquote>
 py -3.8
</blockquote>

Make sure you have <a href="https://docs.python.org/3/using/windows.html#launcher" rel="noreferrer">py launcher</a> installed on your machine. It will be installed automatically if you are using default settings of windows installer. You can always check it if you click on "Customize installation" link on the installation window.

If you have several Python versions installed on your machine and you have a project that is using the previous version of Python using virtual environment e.g. (venv) you can upgrade Python just in that venv using:

<blockquote>
 python -m venv --upgrade "your virtual environment path"
</blockquote>

For instance, I have Python 3.7 in my ./venv virtual environment and I would like upgrade venv to Python 3.8, I would do following

<blockquote>
 python -m venv --upgrade ./venv
</blockquote>

blocks|key|908053|text|只需安装python最新版本的安装程序，它将自动检测到您的python版本，并会说升级python并开始升级。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|908054|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Just install python newest version's installer it will automatically detect your python version and will say upgrade python and starts upgrading

blocks|key|2238794|text|您可以使用碧昂夫。它使您可以轻松地在所有版本的python之间切换。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2238795|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/pyenv-win/pyenv-win^0|5|3|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

You can use <a href="https://github.com/pyenv-win/pyenv-win" rel="nofollow noreferrer">pyenv</a>. It let you easily switch between all versions of python.

blocks|key|2238833|text|对我来说，一个快速而无痛的方法是做以下几件事：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2238834|在受影响的环境上执行pip+freeze+>+requirements.txt+(或任何备份需求的方法)|ordered-list-item|offset|length|style|CODE|2238835|删除Python的旧版本(在我的例子中是3.8)|2238836|删除关联的环境|2238837|安装新版本(在我的例子中为3.9.5)|2238838|重新创建我的环境python+-m+venv+venv或任何您想要的|2238839|重新安装我的插件/应用程序pip+install+-r+requirements.txt或任何你想要的|2238840|entityMap^0|0|A|T|0|0|0|0|8|J|0|D|V|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@$E|W|F|X|G|H]]|9|@]|A|$]]|$1|I|3|J|5|D|7|Y|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|Z|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|10|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|11|8|@$E|12|F|13|G|H]]|9|@]|A|$]]|$1|Q|3|R|5|D|7|14|8|@$E|15|F|16|G|H]]|9|@]|A|$]]|$1|S|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|T|$]]

A quick and painless way for me was to do the following:
<ol>
<li>Do a <code>pip freeze &gt; requirements.txt</code> on my affected environments (or whatever method you want for backing up your requirements)</li>
<li>Remove the Old version of Python (in my case it was 3.8)</li>
<li>Remove the associated environments</li>
<li>Install the new version (3.9.5 in my case)</li>
<li>Recreate my environments <code>python -m venv venv</code> or however you wish</li>
<li>Reinstall my plug-ins/apps <code>pip install -r requirements.txt</code> or however you wish</li>
</ol>

blocks|key|2239026|text|我能够使用下面的命令执行PowerShell，并且没有问题地升级了python。-m+pip安装-升级pip请参阅图像|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2239027|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I was able to execute PowerShell with the following command and python upgraded with no issue. python -m pip install --upgrade pip please see image

blocks|key|2239043|text|现在，您可以从Microsoft安装几个Python版本。这些都是由Python软件基金会发布的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2239044|​|2239045|📷|atomic|offset|length|2239046|2239047|https://apps.microsoft.com/store/search?hl=en-en&gl=EN&publisher=Python%2520Software%2520Foundation|2239048|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/334ae4e906c053f0a43f7a685cd9910e.png|imageAlt|1|LINK|MUTABLE|url|https://apps.microsoft.com/store/search?hl=en-en&gl=EN&publisher=Python%2520Software%2520Foundation^0|0|0|0|1|0|0|0|0|2N|1|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|10|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|11|8|@]|9|@$G|12|H|13|1|14]]|A|$]]|$1|I|3|C|5|6|7|15|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|16|8|@]|9|@$G|17|H|18|1|19]]|A|$]]|$1|L|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S|T|-4]]|U|$5|V|P|W|A|$X|Y]]]]

Nowadays you can just install several Python versions from Microsoft Store. Those are published there by Python Software Foundation.
<a href="https://i.stack.imgur.com/JBIRC.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/JBIRC.png" alt="Python versions availble in Microsoft Store" /></a>
<a href="https://apps.microsoft.com/store/search?hl=en-en&amp;gl=EN&amp;publisher=Python%20Software%20Foundation" rel="nofollow noreferrer">https://apps.microsoft.com/store/search?hl=en-en&amp;gl=EN&amp;publisher=Python%20Software%20Foundation</a>

I have a Python 2.7.11 installed on one of my LAB stations. I would like to upgrade Python to at least 3.5.

How should I do that ?
Should I prefer to completely uninstall 2.7.11 and than install the new one ?
Is there a way to update it ? Is an update a good idea ?

How do I upgrade the Python installation in Windows 10?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我的一个实验室安装了Python2.7.11。我希望将Python升级到至少3.5。我该怎么做？我应该更喜欢完全卸载2.7.11而不是安装新的？有办法更新吗？更新是个好主意吗？

问如何在Windows 10中升级Python安装？
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问如何在Windows 10中升级Python安装？EN