安裝多個版本的python
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sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt-get update
sudo apt-get install python3.6
sudo apt-get install python3.7
sudo apt-get install python3.8
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查看本機安裝的python有哪些
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knightli@ubuntu:/etc/alternatives$ ls -larth `which python`*
lrwxrwxrwx 1 root root 58 Feb 17 2020 /usr/bin/pythontex -> ../share/texlive/texmf-dist/scripts/pythontex/pythontex.py
lrwxrwxrwx 1 root root 16 Mar 13 2020 /usr/bin/python3-config -> python3.8-config
lrwxrwxrwx 1 root root 9 Mar 13 2020 /usr/bin/python2 -> python2.7
-rwxr-xr-x 1 root root 388 Mar 27 2020 /usr/bin/python3-pasteurize
-rwxr-xr-x 1 root root 384 Mar 27 2020 /usr/bin/python3-futurize
lrwxrwxrwx 1 root root 7 Apr 15 2020 /usr/bin/python -> python2
lrwxrwxrwx 1 root root 33 Jul 28 05:59 /usr/bin/python3.8-config -> x86_64-linux-gnu-python3.8-config
-rwxr-xr-x 1 root root 5.3M Jul 28 05:59 /usr/bin/,python3.8
-rwxr-xr-x 1 root root 3.5M Aug 4 04:16 /usr/bin/python2.7
-rwxr-xr-x 2 root root 4.3M Aug 17 16:45 /usr/bin/python3.6m
-rwxr-xr-x 2 root root 4.3M Aug 17 16:45 /usr/bin/python3.6
-rwxr-xr-x 2 root root 5.3M Aug 17 19:07 /usr/bin/python3.7m
-rwxr-xr-x 2 root root 5.3M Aug 17 19:07 /usr/bin/python3.7
lrwxrwxrwx 1 root root 25 Dec 16 19:39 /usr/bin/python3 -> /etc/alternatives/python3
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從以上可以看出一共安裝了 python2.7,python3.6,python3.7,python3.8 四個版本
使用update-alternatives管理多個版本的python
alternatives install python 項目
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knightli@ubuntu:/etc/alternatives$ sudo update-alternatives --install /usr/bin/python python /usr/bin/python2.7 1
update-alternatives: using /usr/bin/python2.7 to provide /usr/bin/python (python) in auto mode
knightli@ubuntu:/etc/alternatives$ sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.6 2
update-alternatives: using /usr/bin/python3.6 to provide /usr/bin/python (python) in auto mode
knightli@ubuntu:/etc/alternatives$ sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.7 3
update-alternatives: using /usr/bin/python3.7 to provide /usr/bin/python (python) in auto mode
knightli@ubuntu:/etc/alternatives$ sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.8 4
update-alternatives: using /usr/bin/python3.8 to provide /usr/bin/python (python) in auto mode
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添加完以後可以用 alternatives –list 列出安裝的python
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knightli@ubuntu:/etc/alternatives$ sudo update-alternatives --list python
/usr/bin/python2.7
/usr/bin/python3.6
/usr/bin/python3.7
/usr/bin/python3.8
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使用alternatives –config 切換
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knightli@ubuntu:/etc/alternatives$ sudo update-alternatives --config python
There are 4 choices for the alternative python (providing /usr/bin/python).
Selection Path Priority Status
------------------------------------------------------------
* 0 /usr/bin/python3.8 4 auto mode
1 /usr/bin/python2.7 1 manual mode
2 /usr/bin/python3.6 2 manual mode
3 /usr/bin/python3.7 3 manual mode
4 /usr/bin/python3.8 4 manual mode
Press <enter> to keep the current choice[*], or type selection number: 3
update-alternatives: using /usr/bin/python3.7 to provide /usr/bin/python (python) in manual mode
knightli@ubuntu:/etc/alternatives$ python -V
Python 3.7.9
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pip 的使用
使用 “python -m pip install xxx " 安裝對應版本的pip