[root@edb ~]$ pip3 install psycopg2
Defaulting to user installation because normal site-packages is not writeable
Collecting psycopg2
  Using cached psycopg2-2.9.3.tar.gz (380 kB)
  Preparing metadata (setup.py) ... error
  error: subprocess-exited-with-error

  × python setup.py egg_info did not run successfully.
  │ exit code: 1
  ╰─> [1 lines of output]
      ERROR: Can not execute `setup.py` since setuptools is not available in the build environment.
      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed

× Encountered error while generating package metadata.
╰─> See above for output.

note: This is an issue with the package mentioned above, not pip.
hint: See above for details.

最后倒数第二句说的是包的问题，不是pip命令的问题，说明python安装的是没问题的，解决方案：

[root@edb ~]$ pip3 install --upgrade setuptools
[root@edb ~]$ pip3 install psycopg2

或者如下，多一步：

[root@edb ~]$ pip3 install --upgrade setuptools
Requirement already satisfied: setuptools in /usr/local/Python3.10/lib/python3.10/site-packages (58.1.0)
Collecting setuptools
  Downloading setuptools-68.2.2-py3-none-any.whl (807 kB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 807.9/807.9 KB 991.8 kB/s eta 0:00:00
Installing collected packages: setuptools
  Attempting uninstall: setuptools
    Found existing installation: setuptools 58.1.0
    Uninstalling setuptools-58.1.0:
      Successfully uninstalled setuptools-58.1.0
Successfully installed setuptools-68.2.2
WARNING: Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager. It is recommended to use a virtual environment instead: https://pip.pypa.io/warnings/venv
WARNING: You are using pip version 22.0.4; however, version 23.2.1 is available.
You should consider upgrading via the '/usr/local/Python3.10/bin/python3.10 -m pip install --upgrade pip' command.
[root@edb ~]$ python3 -m pip install --upgrade pip
[root@edb ~]$ pip3 install psycopg2