Linux系统中python版本切换

1.列出Linux中的python版本

ls -l /usr/bin/python*

结果如下:

lrwxrwxrwx 1 root root       9 Apr 16  2018 /usr/bin/python -> python2.7
lrwxrwxrwx 1 root root      16 Apr 16  2018 /usr/bin/python-config -> python2.7-config
lrwxrwxrwx 1 root root       9 Apr 16  2018 /usr/bin/python2 -> python2.7
lrwxrwxrwx 1 root root      16 Apr 16  2018 /usr/bin/python2-config -> python2.7-config
-rwxr-xr-x 1 root root 3665768 Jul 20 15:37 /usr/bin/python2.7
lrwxrwxrwx 1 root root      33 Jul 20 15:37 /usr/bin/python2.7-config -> x86_64-linux-gnu-python2.7-config
lrwxrwxrwx 1 root root       9 Oct 25  2018 /usr/bin/python3 -> python3.6
lrwxrwxrwx 1 root root      16 Oct 25  2018 /usr/bin/python3-config -> python3.6-config
-rwxr-xr-x 2 root root 4526456 Jul 17 12:50 /usr/bin/python3.6
lrwxrwxrwx 1 root root      33 Jul 17 12:50 /usr/bin/python3.6-config -> x86_64-linux-gnu-python3.6-config
-rwxr-xr-x 2 root root 4526456 Jul 17 12:50 /usr/bin/python3.6m
lrwxrwxrwx 1 root root      34 Jul 17 12:50 /usr/bin/python3.6m-config -> x86_64-linux-gnu-python3.6m-config
lrwxrwxrwx 1 root root      10 Oct 25  2018 /usr/bin/python3m -> python3.6m
lrwxrwxrwx 1 root root      17 Oct 25  2018 /usr/bin/python3m-config -> python3.6m-config

系统中存在python2.7和python3.6的版本
2. 移除python2.7

rm -rf /usr/bin/python

3.创建软连接python指向python3

ln -s /usr/bin/python3 /usr/bin/python

4.查看python版本

python -V

结果: