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沈浪熊猫儿：如何在Debian中更改默认的Python版本

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沈浪熊猫儿 2022-08-06 00:38:34 +08:00
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<TeXmacs|2.1.3>
<style|<tuple|generic|chinese>>
<\body>
<doc-data|<doc-title|如何在Debian中切换默认Python版本>>
首先查看当前系统中默认的Python版本：
<\session|shell|default>
<\output>
Shell session inside TeXmacs pid = 1042144
</output>
<\unfolded-io|Shell] >
python --version
<|unfolded-io>
Python 3.7.7
</unfolded-io>
<\input|Shell] >
\;
</input>
</session>
然后查看当前系统可用的Python有哪些：
<\session|shell|default>
<\unfolded-io|Shell] >
ls /usr/bin/python[0-9].*[0-9]
<|unfolded-io>
/usr/bin/python3.10 \ /usr/bin/python3.7 \ /usr/bin/python3.8
\ /usr/bin/python3.9
</unfolded-io>
<\input|Shell] >
\;
</input>
</session>
我们可以把以上的python版本都放入python命令的候补列表：
<\shell-code>
sudo update-alternatives --install /usr/bin/python python
/usr/bin/python3.8 2
sudo update-alternatives --install /usr/bin/python python
/usr/bin/python3.9 3
sudo update-alternatives --install /usr/bin/python python
/usr/bin/python3.10 4
</shell-code>
现在我们可以列出这个候补列表
<\session|shell|default>
<\unfolded-io|Shell] >
update-alternatives --list python
<|unfolded-io>
/usr/bin/python3.10
/usr/bin/python3.7
/usr/bin/python3.8
/usr/bin/python3.9
</unfolded-io>
<\unfolded-io|Shell] >
python --version
<|unfolded-io>
Python 3.10.5
</unfolded-io>
<\input|Shell] >
\;
</input>
</session>
现在默认的Python版本已经切换到Python
3.10.5，说明上面最后的数字越大，优先级越高。
我们也可以使用
<\shell-code>
<code|update-alternatives --config python>
</shell-code>
在终端中以交互模式选择我们的默认Python版本。
</body>
<\initial>
<\collection>
<associate|page-medium|paper>
</collection>
</initial>