如何在ubuntu上将python版本从3.7.5降级到3.6.5 [英] How do I downgrade my version of python from 3.7.5 to 3.6.5 on ubuntu
问题描述
所以目前,我有ubuntu19.Python3.7.5默认提供了它.我需要降级到 3.6.5.
So currently, I have ubuntu 19. And it comes by default with python 3.7.5. I need to downgrade to 3.6.5.
我正在使用virtualenv
I am using virtualenv
推荐答案
以下内容讨论了从3.6.7升级到3.7.0的过程,但是您可以使用相同的过程进行降级.除非您真的知道自己在做什么,否则不应该更改系统python
The following talks about upgrade from 3.6.7 to 3.7.0 but you can use the same process for downgrade. You should not change the system python unless you really know what you're doing
$ pyenv
pyenv 1.2.14
Usage: pyenv <command> [<args>]
Some useful pyenv commands are:
commands List all available pyenv commands
activate Activate virtual environment
commands List all available pyenv commands
deactivate Deactivate virtual environment
doctor Verify pyenv installation and deevlopment tools to build pythons.
exec Run an executable with the selected Python version
global Set or show the global Python version
help Display help for a command
hooks List hook scripts for a given pyenv command
init Configure the shell environment for pyenv
install Install a Python version using python-build
local Set or show the local application-specific Python version
prefix Display prefix for a Python version
rehash Rehash pyenv shims (run this after installing executables)
root Display the root directory where versions and shims are kept
shell Set or show the shell-specific Python version
shims List existing pyenv shims
uninstall Uninstall a specific Python version
--version Display the version of pyenv
version Show the current Python version and its origin
version-file Detect the file that sets the current pyenv version
version-name Show the current Python version
version-origin Explain how the current Python version is set
versions List all Python versions available to pyenv
virtualenv Create a Python virtualenv using the pyenv-virtualenv plugin
virtualenv-delete Uninstall a specific Python virtualenv
virtualenv-init Configure the shell environment for pyenv-virtualenv
virtualenv-prefix Display real_prefix for a Python virtualenv version
virtualenvs List all Python virtualenvs found in `$PYENV_ROOT/versions/*'.
whence List all Python versions that contain the given executable
which Display the full path to an executable
See `pyenv help <command>' for information on a specific command.
For full documentation, see: https://github.com/pyenv/pyenv#readme
查看Python版本
$ pyenv versions
system
* 3.6.7 (set by /home/taarimalta/.pyenv/version)
安装新的Python
$ pyenv install 3.7.0
Installing Python-3.7.0...
WARNING: The Python bz2 extension was not compiled. Missing the bzip2 lib?
WARNING: The Python readline extension was not compiled. Missing the GNU readline lib?
WARNING: The Python sqlite3 extension was not compiled. Missing the SQLite3 lib?
Installed Python-3.7.0 to /home/taarimalta/.pyenv/versions/3.7.0
如果遇到_ctypes问题,请安装libffi-dev库
If you run into an issue with _ctypes install libffi-dev library
$ pyenv versions
system
* 3.6.7 (set by /home/taarimalta/.pyenv/version)
3.7.0
为本地环境选择3.7.0
$ pyenv local 3.7.0
确认版本已更改
$ pyenv versions
system
3.6.7
* 3.7.0 (set by /home/taarimalta/.python-version)
$ python
Python 3.7.0 (default, Jan 1 2020, 10:52:57)
[GCC 9.2.1 20191008] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>
切换到其他文件夹
cd ../project2
pyenv versions
system
* 3.6.7 (set by /home/taarimalta/.pyenv/version)
3.7.0
这里的python版本可能会有所不同,具体取决于您在本地设置的python版本
The python version may be different here depending on which python version you have set locally
这将为用户全局设置python版本
This globally sets a python version for a user
pyenv global 3.7.0
请注意,pyenv通过添加.python-version文件来设置本地版本
Note that pyenv sets local version by adding a .python-version file
$ pyenv local 3.7.0
$ cat .python-version
3.7.0
请注意,pyenv通过查看〜/.pyenv/version
文件
Note that pyenv knows the global version by looking at the ~/.pyenv/version
file
cat ~/.pyenv/version
3.8.2
这篇关于如何在ubuntu上将python版本从3.7.5降级到3.6.5的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!