methods

update-alternate

sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.4 priority_number

查看已有的 python alternatives

sudo update-alternatives --config python

问题 更新python的版本之后，会导致奇怪的问题

st@st-MS-7918:~$ add-apt-repository --help
Traceback (most recent call last):
  File "/usr/bin/add-apt-repository", line 11, in <module>
    from softwareproperties.SoftwareProperties import SoftwareProperties, shortcut_handler
  File "/usr/lib/python3/dist-packages/softwareproperties/SoftwareProperties.py", line 28, in <module>
    import apt_pkg
ModuleNotFoundError: No module named 'apt_pkg'

软链接

在搜索路径下，将python链接到目标python版本下的可执行文件

sudo ln -sfn path_to_tar_python/bin/python3.6 /usr/bin/python3

ln的基本用法

ln [options] TARGET LINK_NAME

Options

  • s: symbolic, make symbolic links instead of hard links
  • f: force
  • n: no-dereference, treat LINK_NAME as a normal file if it is a symbolic link to a directory

同样存在上述问题