blocks|key|37115|text|尝试输入python3而不只是python。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|37116|entityMap^0|4|7|F|6|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

Try typing <code>python3</code> instead of just <code>python</code>.

blocks|key|2506160|text|在OS+X+El+Capitan版本中，您可以在/opt/local/Library/Frameworks/Python.framework/Versions/3.4/bin/python3.4中找到解释器|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2506161|通过将此路径拖入终端并按enter，您将能够运行此版本。|2506162|为了更快地运行它，您可以通过键入终端：alias+python+=+'python3.4'来创建一个别名。|2506163|entityMap^0|O|21|0|0|J|Q|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|J|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|K|$]]

In the version OS X El Capitan, you can find the interpreter in: <code>/opt/local/Library/Frameworks/Python.framework/Versions/3.4/bin/python3.4</code>

By dragging this path into the Terminal and pressing enter you will be able to run this version.

To run it faster you can either create an alias by typing in the Terminal: <code>alias python = 'python3.4'</code>.

blocks|key|2716648|text|虽然@rhombidodecahedron的答案简明扼要，@Nacho+Izquierdo完美地回答了你的第一个问题，但我的答案旨在更详细地回答你的第二个问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2716649|一个人不应该卸载Python2.7，它是随Mac一起提供的；它是由苹果公司提供的，是在OS+X上运行的应用程序所需要的。它存储在/System/Library/Frameworks/..中。如果将其删除，将不得不重新安装Mac+OS+X。|offset|length|style|CODE|2716650|希望这能有所帮助！为了重申@rhombidodecahedron和@Nacho+Izquierdo给出的答案，请分别安装Python3.x并使用python3，如果您想使用该版本的话。|2716651|Python+2.7是标准，Python+3.x是未来。|2716652|entityMap^0|0|1S|T|0|20|7|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@$D|P|E|Q|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|R|8|@$D|S|E|T|F|G]]|9|@]|A|$]]|$1|J|3|K|5|6|7|U|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|M|$]]

While @rhombidodecahedron's answer is concise and to-the-point and @Nacho Izquierdo addresses your first question perfectly, my answer aims to answer your second question in some more detail:

One should not uninstall Python 2.7 which comes with Mac OS X; it is supplied by Apple and is needed for applications running on OS X. It is stored in <code>/System/Library/Frameworks/..</code>. If it is removed, Mac OS X will have to be reinstalled.

Hope that helps! And to reiterate answers given by @rhombidodecahedron and @Nacho Izquierdo, install Python 3.x separately and use <code>python3</code> if you would like to use that version. 

Python 2.7 is the standard, Python 3.x is the future.

blocks|key|37151|text|您可以使用pyenv轻松完成此操作，这是一个简单的Python版本管理。它允许用户设置在特定目录上运行的特定Python版本，也可以在使用shell之前更改版本|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|37152|即|37153|$+pyenv+install+2.7.6
$+pyenv+install+2.6.8
$+pyenv+local+2.7.6
$+pyenv+versions
++system
++2.6.8
*+2.7.6+(set+by+/home/yyuu/.pyenv/version)|code-block|syntax|javascript|37154|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/pyenv/pyenv#basic-github-checkout^0|5|5|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

You can easily do this using <a href="https://github.com/pyenv/pyenv#basic-github-checkout" rel="nofollow noreferrer">pyenv</a> which is a Simple Python Version Management. It allows one to set specific Python versions to run on specific directories or one can change your version before using shell 

i.e. 

<pre><code>$ pyenv install 2.7.6
$ pyenv install 2.6.8
$ pyenv local 2.7.6
$ pyenv versions
 system
 2.6.8
* 2.7.6 (set by /home/yyuu/.pyenv/version)
</code></pre>

blocks|key|2716687|text|因为我知道我将只使用python3，所以我在.bash_profile文件中添加了以下两行：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2716688|alias+python="python3"+#+to+use+python3+rather+than+python2.7
alias+idle="idle3"+#+to+use+python3+idle+rather+than+2.7|code-block|syntax|javascript|2716689|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Since I know I'll only use python3, I added these 2 lines to .bash_profile file:

<pre><code>alias python="python3" # to use python3 rather than python2.7
alias idle="idle3" # to use python3 idle rather than 2.7
</code></pre>

blocks|key|2506267|text|你不应该做的是-|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2506268|将默认python二进制文件移动到未使用的名称|2506269|$+sudo+mv+/usr/bin/python+/usr/bin/python2|offset|length|style|CODE|2506270|然后将新的二进制文件移动到默认路径|2506271|$+sudo+mv+$PATHTOBINARY/python3+/usr/bin/python|2506272|可以做但不应该做的事情|2506273|因为我默认使用zsh，所以我在.zshrc文件中放入了以下内容：|2506274|$+echo+"alias+python=/usr/local/bin/python3.7"+>>+~/.zshrc|2506275|如果您使用的是缺省的Bash+shell，则可以将相同的文本附加到.bashrc|2506276|$+echo+"alias+python=/usr/local/bin/python3.7"+>>+~/.bashrc|2506277|这是可行的，但不是推荐的方式，因为将来对Python进行更新将很困难。这意味着我们必须手动下载新文件，因为Python不包含更新的命令行方式。|2506278|正确的方法是什么？|2506279|所有Python开发的基本前提是永远不要使用系统Python。您不希望Mac+OS+X的“默认Python”为“python3”。|2506280|建议使用pyenv来管理Python环境。|2506281|$+brew+install+pyenv|2506282|$+pyenv+install+3.7.3|2506283|$+pyenv+global+3.7.3|2506284|$+pyenv+version|2506285|刷新当前终端并检查|2506286|$+python+-V|2506287|它应该给Python+3.7.3|2506288|这样你就可以走了。|2506289|进一步参考-+https://opensource.com/article/19/5/python-3-default-mac|2506290|entityMap|0|LINK|mutability|MUTABLE|url|https://opensource.com/article/19/5/python-3-default-mac^0|0|0|0|16|0|0|0|1B|0|0|F|6|0|0|1M|0|X|7|0|0|1N|0|0|0|0|4|5|0|0|K|0|0|L|0|0|K|0|0|F|0|0|0|B|0|4|C|0|0|7|1K|0|0^^$0|@$1|2|3|4|5|6|7|1V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1W|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|1X|8|@$F|1Y|G|1Z|H|I]]|9|@]|A|$]]|$1|J|3|K|5|6|7|20|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|21|8|@$F|22|G|23|H|I]]|9|@]|A|$]]|$1|N|3|O|5|6|7|24|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|25|8|@$F|26|G|27|H|I]]|9|@]|A|$]]|$1|R|3|S|5|6|7|28|8|@$F|29|G|2A|H|I]]|9|@]|A|$]]|$1|T|3|U|5|6|7|2B|8|@$F|2C|G|2D|H|I]]|9|@]|A|$]]|$1|V|3|W|5|6|7|2E|8|@$F|2F|G|2G|H|I]]|9|@]|A|$]]|$1|X|3|Y|5|6|7|2H|8|@]|9|@]|A|$]]|$1|Z|3|10|5|6|7|2I|8|@]|9|@]|A|$]]|$1|11|3|12|5|6|7|2J|8|@]|9|@]|A|$]]|$1|13|3|14|5|6|7|2K|8|@$F|2L|G|2M|H|I]]|9|@]|A|$]]|$1|15|3|16|5|6|7|2N|8|@$F|2O|G|2P|H|I]]|9|@]|A|$]]|$1|17|3|18|5|6|7|2Q|8|@$F|2R|G|2S|H|I]]|9|@]|A|$]]|$1|19|3|1A|5|6|7|2T|8|@$F|2U|G|2V|H|I]]|9|@]|A|$]]|$1|1B|3|1C|5|6|7|2W|8|@$F|2X|G|2Y|H|I]]|9|@]|A|$]]|$1|1D|3|1E|5|6|7|2Z|8|@]|9|@]|A|$]]|$1|1F|3|1G|5|6|7|30|8|@$F|31|G|32|H|I]]|9|@]|A|$]]|$1|1H|3|1I|5|6|7|33|8|@$F|34|G|35|H|I]]|9|@]|A|$]]|$1|1J|3|1K|5|6|7|36|8|@]|9|@]|A|$]]|$1|1L|3|1M|5|6|7|37|8|@]|9|@$F|38|G|39|1|3A]]|A|$]]|$1|1N|3|-4|5|6|7|3B|8|@]|9|@]|A|$]]]|1O|$1P|$5|1Q|1R|1S|A|$1T|1U]]]]

<h1>What you should not do -</h1>
moving default python binary to an unused name
<code>$ sudo mv /usr/bin/python /usr/bin/python2 </code>
and then moving the new binary to the default path
<code>$ sudo mv $PATHTOBINARY/python3 /usr/bin/python</code>
<h1>What could be done but also shouldn't not be done</h1>
Since I use zsh by default, I put the following into the <code>.zshrc</code> file:
<code>$ echo &quot;alias python=/usr/local/bin/python3.7&quot; &gt;&gt; ~/.zshrc</code>
If you are using the default Bash shell, you can append this same text to your <code>.bashrc</code>:
<code>$ echo &quot;alias python=/usr/local/bin/python3.7&quot; &gt;&gt; ~/.bashrc</code>
This will work but it is not the recommended way because making future updates to Python will be difficult. It means we have to manually download the new files since Python doesn't include a command-line way to update.
<h1>What is the right way</h1>
The basic premise of all Python development is to never use the system Python. You do not want the Mac OS X 'default Python' to be 'python3'.
Usage of <code>pyenv</code> to manage Python environments is recommended.
<code>$ brew install pyenv </code>
<code>$ pyenv install 3.7.3</code>
<code>$ pyenv global 3.7.3</code>
<code>$ pyenv version</code>
Refresh the current terminal and check
<code>$ python -V</code>
It should give <code>Python 3.7.3</code>
This way you are good to go.
For further reference - <a href="https://opensource.com/article/19/5/python-3-default-mac" rel="noreferrer">https://opensource.com/article/19/5/python-3-default-mac</a>

blocks|key|37411|text|对于windows用户，我只是删除了包含python2.7的文件夹。我刚刚重装了python+3.x.x，然后重启了我的笔记本电脑。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|37412|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|$]]

For windows users, I just deleted the folder containing the python2.7. I just reinstalled the python 3.x.x and after that reboot my laptop.

blocks|key|37588|text|经过几个小时的链接，取消链接，卸载和安装python，以获得版本回调Python3.8.5，而不是Python2.7，将这两行添加到上面谢里夫·申迪回答的.bash_profile文件中，我就是这么做的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|37589|alias+python="python3"+#+to+use+python3+rather+than+python2.7+alias+idle="idle3"+#+to+use+python3+idle+rather+than+2.7|offset|length|style|CODE|37590|entityMap^0|0|0|1P|1Q|1K|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]|$D|N|E|O|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|P|8|@]|9|@]|A|$]]]|I|$]]

After several hours of linking, unlinking, uninstalling and installing python to get a version callback python 3.8.5 rather than python 2.7 adding these 2 lines to .bash_profile file answered above by Sherif Shendidy is what worked for me.
<code>alias python=&quot;python3&quot; # to use python3 rather than python2.7</code>
<code>alias idle=&quot;idle3&quot; # to use python3 idle rather than 2.7</code>

blocks|key|2506332|text|我在windows上也遇到过类似的问题，我想在windows上解决这个问题。如果您已经安装了Python2和Python3，请注意:安装时请确保单击"Add+to+environment+variables"或"Add+to+path“。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2506333|检查cmd：python+-V中的版本|2506334|如果显示2.x，windows+>+edit系统环境变量>环境变量>用户变量>+path单击edit，您应该会注意到一堆按某种顺序排列的目录。找到一个与下面类似的目录：C:\Users\some+name\AppData\Local\Programs\Python\Python3.x\单击Move+up，直到该目录在顶部。单击ok。现在重新启动cmd。输入您将找到的3.x的python+-V|2506335|entityMap^0|22|U|0|6|9|0|1A|4|2C|1N|41|7|4K|2|54|3|58|9|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|R|8|@$9|S|A|T|B|C]|$9|U|A|V|B|C]|$9|W|A|X|B|C]|$9|Y|A|Z|B|C]|$9|10|A|11|B|C]|$9|12|A|13|B|C]]|D|@]|E|$]]|$1|J|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|K|$]]

I have encountered similar problem on windows as well.I would like to address this issue on windows.
If you have already installed python 2 and python 3,
Note: While installation make sure you click on <code>&quot;Add to environment variables&quot;</code> or &quot;Add to path&quot;.
Check version in cmd:
<code>python -V</code>
If it shows 2.x,
windows &gt; edit the system environment variables &gt; environment variables &gt; user variables &gt; path
click <code>edit</code>
You should notice a bunch of directories in some order.
Find a directory similar to below:
<code>C:\Users\some name\AppData\Local\Programs\Python\Python3.x\</code>
click on <code>Move up</code> until this directory is on top.
click <code>ok</code>.
Now restart the cmd.
type <code>python -V</code>
you will find <code>3.x</code>

I am currently running OS X Yosemite (10.10.2) on my MacBook Pro... By default, Apple ships Python 2.7.6 on Yosemite. 

Just downloaded and ran this installer for Python 3: <code>python-3.4.3-macosx10.6.pkg</code>

When I opened up my Terminal and typed in <code>python</code>, this is what came up:

<pre><code>Python 2.7.6 (default, Sep 9 2014, 15:04:36) 
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.39)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
&gt;&gt;&gt;
</code></pre>

Question(s):

<ol>
<li>Does anyone know where the Python 3.4.3 interpreter was installed? </li>
<li>Do I need to uninstall Python 2.7.3 (if so, how do I go about doing this) before setting a global environmental variable such as PYTHON_HOME to the location of the installed Python 3.4.3?</li>
</ol>

Installed Python 3 on Mac OS X but its still Python 2.7

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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我目前在我的MacBook专业版上运行OS X Yosemite (10.10.2) ...默认情况下，Apple在Yosemite上发布了Python 2.7.6。刚刚下载并运行了Python3的安装程序：python-3.4.3-macosx10.6.pkg当我打开我的终端并键入python时，出现了以下内容：Py...

问在Mac OS X上安装了Python 3，但仍为Python 2.7
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问在Mac OS X上安装了Python 3，但仍为Python 2.7
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