搜索这个问题时看到了这篇博客，感觉略麻烦。我就想有没有更简单的方式。后来摸索出来了，记在这里。

环境

  • Python 3.9.12
  • Ubuntu 18.04 LTS

安装 Python3.9

详见这篇回答。简要转述如下：

sudo apt update
sudo apt install software-properties-common
sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt install python3.9

问题

python3.9 -m pip -V

报错

Traceback (most recent call last):
  File "/usr/lib/python3.9/runpy.py", line 188, in _run_module_as_main
    mod_name, mod_spec, code = _get_module_details(mod_name, _Error)
  File "/usr/lib/python3.9/runpy.py", line 147, in _get_module_details
    return _get_module_details(pkg_main_name, error)
  File "/usr/lib/python3.9/runpy.py", line 111, in _get_module_details
    __import__(pkg_name)
  File "/usr/lib/python3/dist-packages/pip/__init__.py", line 29, in <module>
    from pip.utils import get_installed_distributions, get_prog
  File "/usr/lib/python3/dist-packages/pip/utils/__init__.py", line 23, in <module>
    from pip.locations import (
  File "/usr/lib/python3/dist-packages/pip/locations.py", line 9, in <module>
    from distutils import sysconfig
ImportError: cannot import name 'sysconfig' from 'distutils' (/usr/lib/python3.9/distutils/__init__.py)

解决方法

注意到上文中ppa:deadsnakes/ppa里包含python3.9-venv，而venv显然依赖pip。安装python3.9-venv便能自动处理好依赖。

sudo apt install python3.9-venv

再看python3.9 -m pip -V即可输出正确的

pip 9.0.1 from /usr/lib/python3/dist-packages (python 3.9)