entityMap|blocks|key|fab5c|text|转到“应用程序”，进入“Python”文件夹，应该有一个名为“更新外壳Profile.command”或类似的bash脚本。运行该脚本，它应该可以做到这一点。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4e2mb|更新:看起来你不应该更新它：|8a6ph|如何更改默认的python版本？^0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|G|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|H|9|@]|A|@]|B|$]]|$2|E|4|F|6|7|8|I|9|@]|A|@]|B|$]]]]

Go to 'Applications', enter 'Python' folder, there should be a bash script called 'Update Shell Profile.command' or similar. Run that script and it should do it.

Update: It looks like you should not update it: <a href="https://stackoverflow.com/questions/5846167/how-to-change-default-python-version">how to change default python version?</a>

entityMap|blocks|key|fqn9|text|在系统范围内更改默认python可执行文件的版本可能会破坏一些依赖python2的应用程序。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|fism0|但是，您可以为大多数shell中的命令设置别名，因为macOS+(+10.14及更低版本中的bash；10.15中的zsh+)中的默认shell共享类似的语法。你可以把|amjm|在您的|vfoc|，然后是来源|1nq8p|dk4nf|和/或您的|fmhnt|用下面这样的一句话：|b6hrc|[+-e+~/.profile+]+&&+.+~/.profile|code-block|syntax|javascript|82k3p|这样，您的别名将跨shell工作。|k41j|有了这个，|44hrm|命令现在调用|3pjen|..。如果您想调用“原始”python+(指的是|8c9bc|python2|e8u44|)有时，您可以使用|aqb16|，它将保持别名不变，并在所有shell中工作。|eluqm|如果您更频繁地启动解释器|6emoq|(我愿意)|41ld7|，您还可以创建更多别名进行添加，例如：|7kers|alias+2='python2'
alias+3='python3'|6sftp|提示:对于脚本，而不是使用像这样的shebang：|1i716|#!/usr/bin/env+python|e0uhn|使用：|4rm3s|#!/usr/bin/env+python3|f9vio|这样，系统将使用python3来运行python|419fq|可执行文件|6pn7u|..。^0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|1S|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|1T|9|@]|A|@]|B|$]]|$2|E|4|F|6|7|8|1U|9|@]|A|@]|B|$]]|$2|G|4|H|6|7|8|1V|9|@]|A|@]|B|$]]|$2|I|4|F|6|7|8|1W|9|@]|A|@]|B|$]]|$2|J|4|K|6|7|8|1X|9|@]|A|@]|B|$]]|$2|L|4|M|6|7|8|1Y|9|@]|A|@]|B|$]]|$2|N|4|O|6|P|8|1Z|9|@]|A|@]|B|$Q|R]]|$2|S|4|T|6|7|8|20|9|@]|A|@]|B|$]]|$2|U|4|V|6|7|8|21|9|@]|A|@]|B|$]]|$2|W|4|X|6|7|8|22|9|@]|A|@]|B|$]]|$2|Y|4|Z|6|7|8|23|9|@]|A|@]|B|$]]|$2|10|4|11|6|7|8|24|9|@]|A|@]|B|$]]|$2|12|4|13|6|7|8|25|9|@]|A|@]|B|$]]|$2|14|4|15|6|7|8|26|9|@]|A|@]|B|$]]|$2|16|4|17|6|7|8|27|9|@]|A|@]|B|$]]|$2|18|4|19|6|7|8|28|9|@]|A|@]|B|$]]|$2|1A|4|1B|6|7|8|29|9|@]|A|@]|B|$]]|$2|1C|4|1D|6|P|8|2A|9|@]|A|@]|B|$Q|R]]|$2|1E|4|1F|6|7|8|2B|9|@]|A|@]|B|$]]|$2|1G|4|1H|6|P|8|2C|9|@]|A|@]|B|$Q|R]]|$2|1I|4|1J|6|7|8|2D|9|@]|A|@]|B|$]]|$2|1K|4|1L|6|P|8|2E|9|@]|A|@]|B|$Q|R]]|$2|1M|4|1N|6|7|8|2F|9|@]|A|@]|B|$]]|$2|1O|4|1P|6|7|8|2G|9|@]|A|@]|B|$]]|$2|1Q|4|1R|6|7|8|2H|9|@]|A|@]|B|$]]]]

Changing the default python executable's version system-wide could break some applications that depend on python2.
However, you can alias the commands in most shells, Since the default shells in macOS (bash in 10.14 and below; zsh in 10.15) share a similar syntax. You could put
<code>alias python='python3'</code>
in your <code>~/.profile</code>, and then source <code>~/.profile</code> in your <code>~/.bash_profile</code> and/or your<code>~/.zsh_profile</code> with a line like:
<pre><code>[ -e ~/.profile ] &amp;&amp; . ~/.profile
</code></pre>
This way, your alias will work across shells.
With this, <code>python</code> command now invokes <code>python3</code>. If you want to invoke the &quot;original&quot; python (that refers to python2) on occasion, you can use <code>command python</code>, which will leaving the alias untouched, and works in all shells.
If you launch interpreters more often (I do), you can always create more aliases to add as well, i.e.:
<pre><code>alias 2='python2'
alias 3='python3'
</code></pre>
<hr />
Tip: For scripts, instead of using a shebang like:
<pre><code>#!/usr/bin/env python
</code></pre>
use:
<pre><code>#!/usr/bin/env python3
</code></pre>
This way, the system will use python3 for running python executables.

entityMap|blocks|key|51j8c|text|我不确定这在OS+X上是否可用，但在linux上我会使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|c1nkv|命令。|etkhi|请看这里|75bcp|..。|1opg0|正确设置模块文件，然后将类似以下内容添加到您的rc文件中(例如~/.bashrc)：|ebedn|module+load+python3.3|code-block|syntax|javascript|53liv|这将使您的路径可以在登录时根据需要进行切换，而不会影响任何系统默认设置。^0|0|0|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|R|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|S|9|@]|A|@]|B|$]]|$2|E|4|F|6|7|8|T|9|@]|A|@]|B|$]]|$2|G|4|H|6|7|8|U|9|@]|A|@]|B|$]]|$2|I|4|J|6|7|8|V|9|@]|A|@]|B|$]]|$2|K|4|L|6|M|8|W|9|@]|A|@]|B|$N|O]]|$2|P|4|Q|6|7|8|X|9|@]|A|@]|B|$]]]]

I'm not sure if this is available on OS X, but on linux I would make use of the <code>module</code> command. <a href="http://linux.die.net/man/1/module" rel="nofollow">See here</a>.

Set up the modulefile correctly, then add something like this to your rc file (e.g. ~/.bashrc):

<pre><code>module load python3.3
</code></pre>

This will make it so that your paths get switched around as required when you log in without impacting any system defaults.

entityMap|blocks|key|eom3m|text|我认为在安装python时，它会将导出路径语句放到~/.bash中|type|unstyled|depth|inlineStyleRanges|entityRanges|data|574ft|_|bl2vb|配置文件。因此，如果您不打算再使用Python2，您可以从那里删除该语句。如上所述的别名也是一个很好的方法。|fef6r|下面是如何从~/.bash中删除引用|ejupm|rl5b|配置文件-vim./.bash|6n6i4|dim6c|配置文件-删除引用(也称为:+export+PATH="/Users/bla/anaconda:$PATH")+-保存并退出源文件。/.bash|ch7kn|c0qc2|保存更改的配置文件^0|0|0|0|0|0|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|R|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|S|9|@]|A|@]|B|$]]|$2|E|4|F|6|7|8|T|9|@]|A|@]|B|$]]|$2|G|4|H|6|7|8|U|9|@]|A|@]|B|$]]|$2|I|4|D|6|7|8|V|9|@]|A|@]|B|$]]|$2|J|4|K|6|7|8|W|9|@]|A|@]|B|$]]|$2|L|4|D|6|7|8|X|9|@]|A|@]|B|$]]|$2|M|4|N|6|7|8|Y|9|@]|A|@]|B|$]]|$2|O|4|D|6|7|8|Z|9|@]|A|@]|B|$]]|$2|P|4|Q|6|7|8|10|9|@]|A|@]|B|$]]]]

I think when you install python it puts export path statements into your ~/.bash_profile file. So if you do not intend to use Python 2 anymore you can just remove that statement from there. Alias as stated above is also a great way to do it.

Here is how to remove the reference from ~/.bash_profile 
- vim ./.bash_profile
- remove the reference (AKA something like: export PATH="/Users/bla/anaconda:$PATH")
- save and exit
- source ./.bash_profile to save the changes

entityMap|blocks|key|8rpe|text|你可以通过符号链接来解决这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|50j3q|unlink+/usr/local/bin/python
ln+-s+/usr/local/bin/python3.3+/usr/local/bin/python|code-block|syntax|javascript^0|0^^$0|$]|1|@$2|3|4|5|6|7|8|H|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|I|9|@]|A|@]|B|$F|G]]]]

You can solve it by symbolic link.

<pre><code>unlink /usr/local/bin/python
ln -s /usr/local/bin/python3.3 /usr/local/bin/python
</code></pre>

entityMap|blocks|key|bod56|text|我相信大多数登陆这里的人都在使用ZSH+thorugh+iterm或其他什么，这会带给你|type|unstyled|depth|inlineStyleRanges|entityRanges|data|6r558|这个答案|fugm1|..。|e49m3|您必须在中添加/修改命令|5e7o7|取而代之的是。^0|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|K|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|L|9|@]|A|@]|B|$]]|$2|E|4|F|6|7|8|M|9|@]|A|@]|B|$]]|$2|G|4|H|6|7|8|N|9|@]|A|@]|B|$]]|$2|I|4|J|6|7|8|O|9|@]|A|@]|B|$]]]]

I believe most of people landed here are using ZSH thorugh iterm or whatever, and that brings you to <a href="https://superuser.com/a/847543">this answer</a>.

You have to add/modify your commands in <code>~/.zshrc</code> instead.

entityMap|blocks|key|1ihag|text|如果您使用的是|type|unstyled|depth|inlineStyleRanges|entityRanges|data|6ngkk|，您可以使用以下命令来定位它|eud45|，然后使用|1nln3|或任何其他编辑器，然后更改以下内容|3mmtd|#+Locate+the+global+Python+where+virtualenvwrapper+is+installed.
if+[+"${VIRTUALENVWRAPPER_PYTHON:-}"+=+""+]
then
++++VIRTUALENVWRAPPER_PYTHON="$(command+\which+python)"
fi|code-block|syntax|javascript|edfg7|更改线路|8epe2|至|90o7n|..。^0|0|0|0|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|T|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|U|9|@]|A|@]|B|$]]|$2|E|4|F|6|7|8|V|9|@]|A|@]|B|$]]|$2|G|4|H|6|7|8|W|9|@]|A|@]|B|$]]|$2|I|4|J|6|K|8|X|9|@]|A|@]|B|$L|M]]|$2|N|4|O|6|7|8|Y|9|@]|A|@]|B|$]]|$2|P|4|Q|6|7|8|Z|9|@]|A|@]|B|$]]|$2|R|4|S|6|7|8|10|9|@]|A|@]|B|$]]]]

If you are using a <code>virtualenvwrapper</code>, you can just locate it using <code>which virtualenvwrapper.sh</code>, then open it using <code>vim</code> or any other editor then change the following 

<pre><code># Locate the global Python where virtualenvwrapper is installed.
if [ "${VIRTUALENVWRAPPER_PYTHON:-}" = "" ]
then
 VIRTUALENVWRAPPER_PYTHON="$(command \which python)"
fi
</code></pre>

Change the line <code>VIRTUALENVWRAPPER_PYTHON="$(command \which python)"</code> to <code>VIRTUALENVWRAPPER_PYTHON="$(command \which python3)"</code>.

entityMap|blocks|key|7rja0|text|下面的方法对我很有效|type|unstyled|depth|inlineStyleRanges|entityRanges|data|eomc5|cd+/usr/local/bin
mv+python+python.old
ln+-s+python3+python|code-block|syntax|javascript^0|0^^$0|$]|1|@$2|3|4|5|6|7|8|H|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|I|9|@]|A|@]|B|$F|G]]]]

The following worked for me

<pre><code>cd /usr/local/bin
mv python python.old
ln -s python3 python
</code></pre>

entityMap|blocks|key|a7b4r|text|转到终端类型：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|nhjc|alias+python=python3.x|code-block|syntax|javascript|16sl5|这会将默认python设置为python3.x^0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|J|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|K|9|@]|A|@]|B|$F|G]]|$2|H|4|I|6|7|8|L|9|@]|A|@]|B|$]]]]

Go to terminal type:

<pre><code>alias python=python3.x
</code></pre>

This will setup default python as python3.x

entityMap|blocks|key|8fm7l|text|对我来说，解决方案是使用PyCharm并将默认python版本设置为我需要使用的版本。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|68b6b|安装PyCharm并进入新项目的==>首选项文件，然后为您的项目选择所需的解释器，在本例中为Python3.3^0|0^^$0|$]|1|@$2|3|4|5|6|7|8|E|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|F|9|@]|A|@]|B|$]]]]

For me the solution was using PyCharm and setting the default python version to the the one that i need to work with.

install PyCharm and go to file ==> preferences for new project, then choose the interpreter you want for your projects, in this case python 3.3

entityMap|blocks|key|4l0sm|text|打开|type|unstyled|depth|inlineStyleRanges|entityRanges|data|588dt|~/.bash|967nf|_|di1kn|配置文件|clej9|文件。|8enlk|vi+~/.bash_profile|code-block|syntax|javascript|1ov8b|然后输入别名，如下所示：|cvfv1|alias+python='python3'|7lj3f|现在保存文件，然后运行|4q648|9od9p|1hgki|8dqmp|d6lrd|source+~/.bash_profile|ek3b4|恭喜！现在，您可以通过输入以下命令来使用python3|92ilk|python|8uomu|..。|84rbo|python+--version|a5ejo|Python+3.7.3^0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|1B|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|1C|9|@]|A|@]|B|$]]|$2|E|4|F|6|7|8|1D|9|@]|A|@]|B|$]]|$2|G|4|H|6|7|8|1E|9|@]|A|@]|B|$]]|$2|I|4|J|6|7|8|1F|9|@]|A|@]|B|$]]|$2|K|4|L|6|M|8|1G|9|@]|A|@]|B|$N|O]]|$2|P|4|Q|6|7|8|1H|9|@]|A|@]|B|$]]|$2|R|4|S|6|M|8|1I|9|@]|A|@]|B|$N|O]]|$2|T|4|U|6|7|8|1J|9|@]|A|@]|B|$]]|$2|V|4|D|6|7|8|1K|9|@]|A|@]|B|$]]|$2|W|4|F|6|7|8|1L|9|@]|A|@]|B|$]]|$2|X|4|H|6|7|8|1M|9|@]|A|@]|B|$]]|$2|Y|4|J|6|7|8|1N|9|@]|A|@]|B|$]]|$2|Z|4|10|6|M|8|1O|9|@]|A|@]|B|$N|O]]|$2|11|4|12|6|7|8|1P|9|@]|A|@]|B|$]]|$2|13|4|14|6|7|8|1Q|9|@]|A|@]|B|$]]|$2|15|4|16|6|7|8|1R|9|@]|A|@]|B|$]]|$2|17|4|18|6|M|8|1S|9|@]|A|@]|B|$N|O]]|$2|19|4|1A|6|7|8|1T|9|@]|A|@]|B|$]]]]

Open ~/.bash_profile file.

<pre><code>vi ~/.bash_profile
</code></pre>

Then put the alias as follows:

<pre><code>alias python='python3'
</code></pre>

Now save the file and then run the ~/.bash_profile file.

<pre><code>source ~/.bash_profile
</code></pre>

Congratulation !!! Now, you can use python3 by typing python.

<pre><code>python --version
</code></pre>

Python 3.7.3

entityMap|blocks|key|6a5o9|text|如果你使用macports，你不需要使用别名或环境变量，只需使用macports已经提供的方法，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|7ngtf|如何:+Macports选择python|eates|TL;DR：|26hst|sudo+port+select+--set+python+python27|code-block|syntax|javascript^0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|L|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|M|9|@]|A|@]|B|$]]|$2|E|4|F|6|7|8|N|9|@]|A|@]|B|$]]|$2|G|4|H|6|I|8|O|9|@]|A|@]|B|$J|K]]]]

If you use macports, you do not need to play with aliases or environment variables, just use the method macports already offers, explained by this Q&amp;A:
<a href="https://stackoverflow.com/questions/8201760/how-to-macports-select-python">How to: Macports select python</a>
TL;DR:
<pre><code>sudo port select --set python python27
</code></pre>

entityMap|blocks|key|87d8l|text|这对我很有效。我添加了|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2h5mf|别名|2thit|并重新启动了我的|9cohr|终端|869tk|alias+python=/usr/local/bin/python3|code-block|syntax|javascript^0|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|N|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|O|9|@]|A|@]|B|$]]|$2|E|4|F|6|7|8|P|9|@]|A|@]|B|$]]|$2|G|4|H|6|7|8|Q|9|@]|A|@]|B|$]]|$2|I|4|J|6|K|8|R|9|@]|A|@]|B|$L|M]]]]

This worked for me. I added alias and restarted my terminal:

<pre><code>alias python=/usr/local/bin/python3
</code></pre>

entityMap|blocks|key|79jit|text|如果您使用的是macports，则有一种更简单的方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3h004|运行：|6gqpt|安装后，设置默认值：|jdjs|重新启动cmd窗口，完成。^0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|I|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|J|9|@]|A|@]|B|$]]|$2|E|4|F|6|7|8|K|9|@]|A|@]|B|$]]|$2|G|4|H|6|7|8|L|9|@]|A|@]|B|$]]]]

If you are using macports, that has a easier way to do:

run:

<code>port install python37</code>

after install, set default:

<code>sudo port select --set python python37</code>

<code>sudo port select --set python3 python37</code>

restart your cmd window, finished.

entityMap|blocks|key|67vmq|text|好吧..。有点老了。但仍然应该得到一个好的答案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2spru|好的一面是|a9ajg|你不会想要触摸Mac上的默认Python。|c80op|通过Homebrew或其他工具安装您需要的任何Python版本，并在virtualenv中使用它。Virtualenv通常被认为是垃圾的东西，但它仍然比在系统范围内更改python版本(macOS可能会保护自己免受此类操作的影响)或在用户范围内更改python版本要好得多。管他呢。忘了默认的Python吧。使用venv这样的游乐场是你的操作系统最感激的事情。|52pmj|例如，许多现代的Linux发行版去掉了开箱即装的Python2，只在系统中留下了Python3。但是每次你尝试用python2作为依赖来安装一些旧的东西...希望你能理解我的意思。一个好的开发人员并不关心。优秀的开发人员可以使用他们想要的python版本创建干净的游乐场。^0|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|K|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|L|9|@]|A|@]|B|$]]|$2|E|4|F|6|7|8|M|9|@]|A|@]|B|$]]|$2|G|4|H|6|7|8|N|9|@]|A|@]|B|$]]|$2|I|4|J|6|7|8|O|9|@]|A|@]|B|$]]]]

Well... It's kinda old. But still deserves a good answer. 

And the good one is You Don't Wanna Touch The Default Python On Mac.

Install any Python version you need via Homebrew or whatever and use it in virtualenv. Virtualenv is often considered to be something crap-like, but it's still way, wayyyy better than changing python version system-wide (macOS is likely to protect itself from such actions) or user-wide, bash-wide... whatever. Just forget about the default Python. Using playgrounds like venv is what your OS will be most, very most grateful for. 

The case is, for example, many modern Linux distributions get rid of Python2 installed out-of-the-box, leaving only Python3 in the system. But everytime you try to install something old with python2 as a dependency... hope you understand what I mean. A good developer doesn't care. Good developers create clean playgrounds with python version they desire.

entityMap|blocks|key|4dagt|text|在Mac上将Python+3设置为默认设置的正确和错误方法|type|unstyled|depth|inlineStyleRanges|entityRanges|data|89p57|在本文中，作者讨论了设置默认python的三种方法：|7itoj|不该做的事。|5oel9|我们可以做什么(但也不应该做)。|c6jna|我们应该怎么做！|a7efi|所有这些方法都是有效的。你来决定哪个更好。^0|0|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|M|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|N|9|@]|A|@]|B|$]]|$2|E|4|F|6|7|8|O|9|@]|A|@]|B|$]]|$2|G|4|H|6|7|8|P|9|@]|A|@]|B|$]]|$2|I|4|J|6|7|8|Q|9|@]|A|@]|B|$]]|$2|K|4|L|6|7|8|R|9|@]|A|@]|B|$]]]]

<a href="https://opensource.com/article/19/5/python-3-default-mac" rel="nofollow noreferrer">The RIGHT and WRONG way to set Python 3 as default on a Mac</a>

In this article author discuss three ways of setting default python:

<ol>
<li>What NOT to do.</li>
<li>What we COULD do (but also shouldn't).</li>
<li>What we SHOULD do!</li>
</ol>

All these ways are working. You decide which is better.

entityMap|blocks|key|c4paj|text|$+sudo+ln+-s+-f+$(which+python3)+$(which+python)|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|c2g4k|好了。|unstyled^0|0^^$0|$]|1|@$2|3|4|5|6|7|8|H|9|@]|A|@]|B|$C|D]]|$2|E|4|F|6|G|8|I|9|@]|A|@]|B|$]]]]

<pre><code>$ sudo ln -s -f $(which python3) $(which python)
</code></pre>

done.

entityMap|blocks|key|1l93e|text|Mac用户只需在终端上运行以下代码|type|unstyled|depth|inlineStyleRanges|entityRanges|data|dfqg4|brew+switch+python+3.x.x|code-block|syntax|javascript|elc98|3.x.x|4uret|应该是新的python版本。|e6j13|这将更新所有系统链接。^0|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|N|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|O|9|@]|A|@]|B|$F|G]]|$2|H|4|I|6|7|8|P|9|@]|A|@]|B|$]]|$2|J|4|K|6|7|8|Q|9|@]|A|@]|B|$]]|$2|L|4|M|6|7|8|R|9|@]|A|@]|B|$]]]]

Mac users just need to run the following code on terminal 

<pre><code>brew switch python 3.x.x
</code></pre>

3.x.x should be the new python version.

This will update all the system links.

entityMap|blocks|key|fncop|text|建议将python别名为python3将导致设置python版本的虚拟环境出现问题(例如:+pyenv)。使用pyenv，您可以全局设置版本，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|fnla1|pyenv+global+3.8.2|code-block|syntax|javascript|fukt4|然后，在任何特定的项目中，您都可以创建一个.python版本的文件，其中包含python版本：|er0cg|pyenv+local+2.7.1|90jdj|在我看来，这是在一个系统上管理多个版本的python的最好方法。^0|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|N|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|O|9|@]|A|@]|B|$F|G]]|$2|H|4|I|6|7|8|P|9|@]|A|@]|B|$]]|$2|J|4|K|6|E|8|Q|9|@]|A|@]|B|$F|G]]|$2|L|4|M|6|7|8|R|9|@]|A|@]|B|$]]]]

Suggestions to alias python to python3 will cause problems with virtual environments that set the version of python (eg: pyenv). With pyenv, you can set the version globally like so:

<pre><code>pyenv global 3.8.2
</code></pre>

and then in any specific project, you can create a .python-version file which has the python version inside of it:

<pre><code>pyenv local 2.7.1
</code></pre>

This is the best way to manage multiple versions of python on a system in my opinion.

entityMap|blocks|key|1aft8|text|在MacOS上|type|unstyled|depth|inlineStyleRanges|entityRanges|data|8s0n9|Step-1:通过以下方式将python升级到最新版本：$+brew+Upgrade+python|fltnf|Step-2:转到主页：$+cd|fu1hb|第-3步:打开.bash|4cas|_|464tt|配置文件|bpcmf|$+vi+.bash|fc2ng|3n4f1|vvqi|设置Python+3.8的路径|frq2l|PATH="/Library/Frameworks/Python.framework/Versions/3.8/bin:${PATH}“导出路径|e7riu|步骤4:保存文件。并通过以下方式对其进行编译：|9mbmr|$。.bash|7jaq6|55tml|1fara|步骤5:检查python版本：|2458p|$+python+-V|63u3q|第六步:这就是全部。^0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|16|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|17|9|@]|A|@]|B|$]]|$2|E|4|F|6|7|8|18|9|@]|A|@]|B|$]]|$2|G|4|H|6|7|8|19|9|@]|A|@]|B|$]]|$2|I|4|J|6|7|8|1A|9|@]|A|@]|B|$]]|$2|K|4|L|6|7|8|1B|9|@]|A|@]|B|$]]|$2|M|4|N|6|7|8|1C|9|@]|A|@]|B|$]]|$2|O|4|J|6|7|8|1D|9|@]|A|@]|B|$]]|$2|P|4|L|6|7|8|1E|9|@]|A|@]|B|$]]|$2|Q|4|R|6|7|8|1F|9|@]|A|@]|B|$]]|$2|S|4|T|6|7|8|1G|9|@]|A|@]|B|$]]|$2|U|4|V|6|7|8|1H|9|@]|A|@]|B|$]]|$2|W|4|X|6|7|8|1I|9|@]|A|@]|B|$]]|$2|Y|4|J|6|7|8|1J|9|@]|A|@]|B|$]]|$2|Z|4|L|6|7|8|1K|9|@]|A|@]|B|$]]|$2|10|4|11|6|7|8|1L|9|@]|A|@]|B|$]]|$2|12|4|13|6|7|8|1M|9|@]|A|@]|B|$]]|$2|14|4|15|6|7|8|1N|9|@]|A|@]|B|$]]]]

<h1>On MacOS</h1>
Step-1: Upgrade python to latest version by:
$ brew upgrade python
Step-2: Go to home:
$ cd 
Step-3: open .bash_profile
$ vi .bash_profile
<h1>Setting PATH for Python 3.8</h1>
PATH=&quot;/Library/Frameworks/Python.framework/Versions/3.8/bin:${PATH}&quot;
export PATH
Step-4: Save the file. And compile it by:
$ . .bash_profile
Step-5: Check the python version:
$ python -V
Step-6: Thats all.

I'm running Mountain Lion and the basic default Python version is 2.7. I downloaded Python 3.3 and want to set it as default.

Currently:

<pre><code>$ python
 version 2.7.5
$ python3.3
 version 3.3
</code></pre>

How do I set it so that every time I run <code>$ python</code> it opens 3.3?

How to set Python's default version to 3.x on OS X?

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 我运行的是Mountain Lion，基本的默认Python版本是2.7。我下载了Python 3.3，并希望将其设置为默认设置。 目前： $ python    version 2.7.5$ python3.3    version 3.3 如何将其设置为每次运行 它打开3.3？

问如何在OS X上将Python的默认版本设置为3.x？
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