blocks|key|2945297|text|您需要将python可执行文件路径添加到窗口的path变量中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2945298|2945299|在桌面上，右键单击我的电脑，然后单击属性。|unordered-list-item|2945300|
|2945301|在系统属性窗口中，单击高级选项卡。|2945302|2945303|在高级部分，单击系统变量部分中的环境变量button.|2945304|2945305|Highlight+Path变量，然后单击编辑按钮。|2945306|2945307|添加python可执行文件(c:\Python27\)的路径。每个不同的目录用分号分隔。(注意:不要在PATH中的元素之间放置空格。您添加到PATH的内容应该是;c:\Python27，而不是;+C\Python27)|offset|length|style|CODE|2945308|2945309|Apply+the+changes。您可能需要重新启动系统，但只需使用sufficient.|2945310|2945311|Launch命令重新启动cmd.exe，然后重试。它应该可以工作。|2945312|2945313|entityMap^0|0|0|0|0|0|0|0|0|0|0|E|C|1F|4|1Y|4|28|C|2O|C|0|0|0|0|C|7|0|0^^$0|@$1|2|3|4|5|6|7|15|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|16|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|17|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|18|8|@]|9|@]|A|$]]|$1|H|3|I|5|E|7|19|8|@]|9|@]|A|$]]|$1|J|3|G|5|6|7|1A|8|@]|9|@]|A|$]]|$1|K|3|L|5|E|7|1B|8|@]|9|@]|A|$]]|$1|M|3|G|5|6|7|1C|8|@]|9|@]|A|$]]|$1|N|3|O|5|E|7|1D|8|@]|9|@]|A|$]]|$1|P|3|G|5|6|7|1E|8|@]|9|@]|A|$]]|$1|Q|3|R|5|E|7|1F|8|@$S|1G|T|1H|U|V]|$S|1I|T|1J|U|V]|$S|1K|T|1L|U|V]|$S|1M|T|1N|U|V]|$S|1O|T|1P|U|V]]|9|@]|A|$]]|$1|W|3|G|5|6|7|1Q|8|@]|9|@]|A|$]]|$1|X|3|Y|5|E|7|1R|8|@]|9|@]|A|$]]|$1|Z|3|G|5|6|7|1S|8|@]|9|@]|A|$]]|$1|10|3|11|5|E|7|1T|8|@$S|1U|T|1V|U|V]]|9|@]|A|$]]|$1|12|3|-4|5|6|7|1W|8|@]|9|@]|A|$]]|$1|13|3|-4|5|6|7|1X|8|@]|9|@]|A|$]]]|14|$]]

You need to add the python executable path to your Window's PATH variable.

<ol>
<li>From the desktop, right-click My Computer and click Properties.</li>
<li>In the System Properties window, click on the Advanced tab.</li>
<li>In the Advanced section, click the Environment Variables button.</li>
<li>Highlight the Path variable in the Systems Variable section and click the Edit
button.</li>
<li>Add the path of your python executable(<code>c:\Python27\</code>). Each different directory is separated with a
semicolon. (Note: do not put spaces between elements in the <code>PATH</code>. Your addition to the <code>PATH</code> should read <code>;c:\Python27</code> NOT <code>; C\Python27</code>)</li>
<li>Apply the changes. You might need to restart your system, though simply restarting <code>cmd.exe</code> should be sufficient.</li>
<li>Launch cmd and try again. It should work.</li>
</ol>

blocks|key|3159272|text|这是因为Python+exec不在操作系统的搜索路径中。在windows中，启动CMD。键入|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3159273|setx+PATH+PythonPath|offset|length|style|CODE|3159274|其中PythonPath通常是C:\Python27、C:\Python33或C:\Users\<Your+User+Name>\AppData\Local\Programs\Python\Python37，具体取决于您的Python版本。在重新启动CMD之后，您应该会在键入时看到see+outcomes|3159275|Python+--version|code-block|syntax|javascript|3159276|entityMap^0|0|0|K|0|F|B|R|B|13|1S|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@$D|S|E|T|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|U|8|@$D|V|E|W|F|G]|$D|X|E|Y|F|G]|$D|Z|E|10|F|G]]|9|@]|A|$]]|$1|J|3|K|5|L|7|11|8|@]|9|@]|A|$M|N]]|$1|O|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|P|$]]

This is because the Python exec are not in the search path of your operating system. In windows, start CMD. Type in 

<code>setx PATH PythonPath</code>

where PythonPath is usually <code>C:\Python27</code> or <code>C:\Python33</code> or <code>C:\Users\&lt;Your User Name&gt;\AppData\Local\Programs\Python\Python37</code> depending on your Python version. After restarting the CMD, you should get see outcomes when typing 

<pre><code>Python --version
</code></pre>

blocks|key|261097|text|Python附带了一个small+utility+that+fixes+this。从命令行运行：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|261098|c:\python27\tools\scripts\win_add2path.py|code-block|syntax|javascript|261099|确保关闭命令窗口(使用exit或close按钮)，然后再次打开它。|style|CODE|261100|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/python/cpython/blob/2.7/Tools/scripts/win_add2path.py^0|B|T|0|0|0|B|4|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@$A|10|B|11|K|L]]|9|@]|C|$]]|$1|M|3|-4|5|6|7|12|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

Python comes with a <a href="https://github.com/python/cpython/blob/2.7/Tools/scripts/win_add2path.py">small utility that fixes this</a>. From the command line run:

<pre><code>c:\python27\tools\scripts\win_add2path.py
</code></pre>

Make sure you close the command window (with <code>exit</code> or the close button) and open it again.

blocks|key|2945344|text|只是对那些刚开始的人的另一种澄清。将C:\PythonXX添加到路径中时，请确保变量之间没有空格，例如|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2945345|这一点：|2945346|SomeOtherDirectory;C:\Python27|2945347|不是这样的：|2945348|SomeOtherDirectory;+C:\Python27|2945349|这让我头疼了整整15分钟才弄明白(我使用的是windows7，可能依赖于操作系统)。祝你编码愉快。|2945350|entityMap^0|I|B|0|0|0|U|0|0|0|V|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|U|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|Y|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@]|E|$]]|$1|N|3|O|5|6|7|12|8|@]|D|@]|E|$]]|$1|P|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|Q|$]]

Just another clarification for those starting out. When you add <code>C:\PythonXX</code> to your path, make sure there are NO SPACES between variables e.g. 

This:

<code>SomeOtherDirectory;C:\Python27</code>

Not this:

<code>SomeOtherDirectory; C:\Python27</code>

That took me a good 15 minutes of headache to figure out (I'm on windows 7, might be OS dependent). Happy coding.

blocks|key|258033|text|很长一段时间我都有同样的问题。我只是设法解决了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|258034|因此，您需要选择您的路径，就像上面所说的其他人一样。我做了什么：|258035|打开命令窗口。编写set+path=C:\Python24+(放置python的位置和版本)。现在输入python，它应该可以工作。|258036|令人恼火的是，每次打开CMD时都必须键入它。|258037|我试着做一个永久的(随着环境变量的变化)，但对我来说它不起作用。|258038|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|N|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|O|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

I had the same problem for a long time. 
I just managed to resolve it. 

So, you need to select your Path, like the others said above.
What I did:

Open a command window. Write set path=C:\Python24 (put the location and the version for your python). Now type python, It should work.

The annoying part with this is that you have to type it every time you open the CMD.

I tried to do the permanent one (with the changes in the Environmental variables) but for me its not working.

blocks|key|261212|text|您可以在python安装程序中执行此操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|261213|📷|atomic|offset|length|261214|​|261215|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/3a63bda0d9e94359d60d920d068aca5d.png|imageAlt^0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|S|8|@]|9|@$E|T|F|U|1|V]]|A|$]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|P|Q|-4]]]]

You can do it in python installer:
<a href="https://i.stack.imgur.com/bdsSl.png" rel="noreferrer"><img src="https://i.stack.imgur.com/bdsSl.png" alt="enter image description here"></a>

blocks|key|3159234|text|进入控制面板/系统/“高级”选项卡/环境变量|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3159235|在下面的列表中找到名为PATH的变量，并对其进行编辑。添加到末尾C:\Python27|3159236|打开一个新的cmd窗口并立即尝试。|3159237|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Go to Control Panel / System / "Advanced" tab / Enviromental Variables

Find variable called PATH in the lower list, and edit it. Add to the end C:\Python27

Open a new cmd window and try now.

blocks|key|261217|text|强调:请记住在设置PATH环境变量后始终重新启动CMD窗口以使其生效！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|261218|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|$]]

emphasis: Remember to always RESTART the CMD WINDOW after setting the PATH environmental variable for it to take effect!

blocks|key|3159421|text|在PowerShell中输入以下内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3159422|用户环境：：SetEnvironmentVariable(“Path”，"$env:Path;C:\Python27"，“|3159423|”)|blockquote|3159424|3159425|3159426|关闭PowerShell，然后重新启动它，以确保Python现在可以运行。如果没有，可能需要重新启动。|3159427|​|3159428|📷|atomic|offset|length|3159429|3159430|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/d1fd8012f2eae32cd5c2bfc3d807c55c.png|imageAlt^0|0|0|0|0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|12|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|13|8|@]|9|@]|A|$]]|$1|G|3|-4|5|6|7|14|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|15|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|16|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|17|8|@]|9|@]|A|$]]|$1|M|3|N|5|O|7|18|8|@]|9|@$P|19|Q|1A|1|1B]]|A|$]]|$1|R|3|L|5|6|7|1C|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z|10|-4]]]]

in PowerShell enter this:

<blockquote>
 [Environment]::SetEnvironmentVariable("Path", "$env:Path;C:\Python27",
 "User")
</blockquote>

Close PowerShell and then start it again to make sure Python now runs. If it doesn’t,
restart may be required.

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

blocks|key|2945437|text|进一步到@Udi+post，这就是脚本试图做的，但对我不起作用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2945438|我必须在PATH中设置以下内容，没有其他内容。|offset|length|style|CODE|2945439|C:\Users\hUTBER\AppData\Local\Programs\Python\Python35
C:\Users\hUTBER\AppData\Local\Programs\Python\Python35\Scripts|code-block|syntax|javascript|2945440|曾经是我的，现在python在cmd工作|2945441|entityMap^0|0|4|4|0|0|8|6|F|3|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@$D|S|E|T|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|U|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|V|8|@$D|W|E|X|F|G]|$D|Y|E|Z|F|G]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|P|$]]

Further to @Udi post this is what the script tried to do, but did not work with me.

I had to the set the following in the <code>PATH</code> nothing else.

<pre><code>C:\Users\hUTBER\AppData\Local\Programs\Python\Python35
C:\Users\hUTBER\AppData\Local\Programs\Python\Python35\Scripts
</code></pre>

Were mine and now <code>python</code> works in the <code>cmd</code>

blocks|key|2945635|text|如果您正在尝试安装python版本的python-3.9.6，请单击的复选框将Python+3.9添加到路径|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|BOLD|entityRanges|data|2945636|​|2945637|📷|atomic|2945638|2945639|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/2a59ccdb974970c7fe79623892027d30.jpeg|imageAlt^0|I|C|Y|K|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@$9|W|A|X|B|C]|$9|Y|A|Z|B|D]]|E|@]|F|$]]|$1|G|3|H|5|6|7|10|8|@]|E|@]|F|$]]|$1|I|3|J|5|K|7|11|8|@]|E|@$9|12|A|13|1|14]]|F|$]]|$1|L|3|H|5|6|7|15|8|@]|E|@]|F|$]]|$1|M|3|-4|5|6|7|16|8|@]|E|@]|F|$]]]|N|$O|$5|P|Q|R|F|$S|T|U|-4]]]]

If you are trying to install python version <code>python-3.9.6</code> then click the checkbox of Add Python 3.9 to PATH
<a href="https://i.stack.imgur.com/lBFvz.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/lBFvz.jpg" alt="enter image description here" /></a>

blocks|key|2945391|text|确保在安装过程中单击Add+python.exe+to+path，并选择：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2945392|2945393|“将安装在本地硬盘上”|blockquote|2945394|2945395|2945396|它解决了我的问题，希望它能帮到我。|2945397|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|M|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|N|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|O|8|@]|9|@]|A|$]]|$1|G|3|-4|5|6|7|P|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|Q|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|K|$]]

Make sure you click on Add python.exe to path during install, and select:

<blockquote>
 "Will be installed on local hard drive"
</blockquote>

It fixed my problem, hope it helps...

blocks|key|258078|text|如果Python在PATH变量中，另一个有用但简单的解决方案可能是在完成下载后重新启动计算机。这是我在将Python下载到一台新机器上时经常犯的错误。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|258079|在重启我的机器之后，Windows通常会识别PATH变量中的Python。|258080|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|$]]

Another helpful but simple solution might be restarting your computer after doing the download if Python is in the PATH variable. This has been a mistake I usually make when downloading Python onto a new machine.

After restarting my machine then Windows will often recognize Python in the PATH variable.

blocks|key|3159546|text|很简单。不需要混淆，但路径和变量以及要单击的内容。只要遵循我的步骤就行了：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3159547|转到python安装程序。运行它。在3个选项中，选择修改。查看py+launcher。下一个。检查“将python添加到环境变量”安装。|3159548|完成后重新启动cmd并启动|3159549|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Easy. Won't need to get confused but paths and variables and what to click. Just follow my steps:
Go to the python installer.
Run it.
Out of the 3 options choose modify.
Check py launcher.
Next.
Check &quot;Add python to environment variables&quot;
Install.
Restart the cmd when finished and boom done

I just downloaded and installed Python 2.7.2 to my laptop and I am trying to run some sample programs. My laptop is running Windows XP.

When I open a <code>cmd</code> window and type <code>python</code> I get:

<blockquote>
 'python' is not recognized as an internal or external command, operable program or batch file.
</blockquote>

I am not a Windows person (mostly mainframes). However I am guessing that there is some command that I need to execute to define python as a command. Can anyone tell me what that command is?

The installer placed Python at <code>C:\Python27\</code>.

"python" not recognized as a command

Windows

Python

我刚刚将Python 2.7.2下载并安装到我的笔记本电脑上，我正在尝试运行一些示例程序。我的笔记本电脑运行的是Windows XP。当我打开一个cmd窗口并输入python时，我得到：python‘’未被识别为内部或外部命令、可操作程序或批处理文件。我不是Windows用户(主要是大型机)。然而，我猜我需要执行一些命令来将python定义为一个命令。谁能告诉我这个命令是什么？安装程序将Pytho

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