Ubuntu16.04切换python版

发布时间：2019-08-09 08:50:59编辑：auto阅读（1343）

    ubuntu16.04中默认已经安装了python2.7和python3.5

    hanli@ubuntu:/usr/bin$ ls |grep python
dh_python2
dh_python3
python
python2
python2.7
python2.7-config
python2-config
python3
python3.5
python3.5m
python3m
python-config
x86_64-linux-gnu-python2.7-config
x86_64-linux-gnu-python-config
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    怎么切换？

    1.现在是2.7

    hanli@ubuntu:/usr/bin$ python
Python 2.7.12 (default, Nov 19 2016, 06:48:10)
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    2.执行两条命令

    hanli@ubuntu:/usr/bin$ sudo update-alternatives --install /usr/bin/python python /usr/bin/python2 100
update-alternatives: using /usr/bin/python2 to provide /usr/bin/python (python) in auto mode
hanli@ubuntu:/usr/bin$ sudo update-alternatives --install /usr/bin/python python /usr/bin/python3 150
update-alternatives: using /usr/bin/python3 to provide /usr/bin/python (python) in auto mode
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    3.再次查看已经变成3.5了

    hanli@ubuntu:/usr/bin$ python
Python 3.5.2 (default, Nov 17 2016, 17:05:23)
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    4.怎么随意切换

    hanli@ubuntu:/usr/bin$ sudo update-alternatives --config python
There are 2 choices for the alternative python (providing /usr/bin/python).

  Selection    Path              Priority   Status
------------------------------------------------------------
* 0            /usr/bin/python3   150       auto mode
  1            /usr/bin/python2   100       manual mode
  2            /usr/bin/python3   150       manual mode

Press <enter> to keep the current choice[*], or type selection number: 1
update-alternatives: using /usr/bin/python2 to provide /usr/bin/python (python) in manual mode

#数字前面有*号表示是当前使用版本，输入1切换到2.7，再次查看如下

hanli@ubuntu:/usr/bin$ sudo update-alternatives --config python
There are 2 choices for the alternative python (providing /usr/bin/python).

  Selection    Path              Priority   Status
------------------------------------------------------------
  0            /usr/bin/python3   150       auto mode
* 1            /usr/bin/python2   100       manual mode
  2            /usr/bin/python3   150       manual mode

Press <enter> to keep the current choice[*], or type selection number:

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