ubuntu16.04同时使用 pyhton2.7和3.5，并随意切换

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

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)

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

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)

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:

转载于:https://www.cnblogs.com/fanren224/p/8457238.html