解决pip install psycopg2出错问题

错误信息：

[root@local soft]# pip3 install psycopg2
Looking in indexes: http://mirrors.cloud.aliyuncs.com/pypi/simple/
Collecting psycopg2
  Using cached http://mirrors.cloud.aliyuncs.com/pypi/packages/d1/1e/b450599a27b1809bccbd4e369f397cb18dc56b875778d961f9ae180b54b7/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
  ╰─> [27 lines of output]
      running egg_info
      creating /tmp/pip-pip-egg-info-98bpr17c/psycopg2.egg-info
      writing /tmp/pip-pip-egg-info-98bpr17c/psycopg2.egg-info/PKG-INFO
      writing dependency_links to /tmp/pip-pip-egg-info-98bpr17c/psycopg2.egg-info/dependency_links.txt
      writing top-level names to /tmp/pip-pip-egg-info-98bpr17c/psycopg2.egg-info/top_level.txt
      writing manifest file '/tmp/pip-pip-egg-info-98bpr17c/psycopg2.egg-info/SOURCES.txt'
      /soft/python3.7.3/lib/python3.7/site-packages/setuptools/dist.py:775: UserWarning: Usage of dash-separated 'index-url' will not be supported in future versions. Please use the underscore name 'index_url' instead
        % (opt, underscore_opt)
      /soft/python3.7.3/lib/python3.7/site-packages/setuptools/config/setupcfg.py:459: SetuptoolsDeprecationWarning: The license_file parameter is deprecated, use license_files instead.
        warnings.warn(msg, warning_class)
     
      Error: pg_config executable not found.
     
      pg_config is required to build psycopg2 from source.  Please add the directory
      containing pg_config to the $PATH or specify the full executable path with the
      option:
     
          python setup.py build_ext --pg-config /path/to/pg_config build ...
     
      or with the pg_config option in 'setup.cfg'.
     
      If you prefer to avoid building psycopg2 from source, please install the PyPI
      'psycopg2-binary' package instead.
     
      For further information please check the 'doc/src/install.rst' file (also at
      <https://www.psycopg.org/docs/install.html>).
     
      [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.

解决方法：

yum install postgresql postgresql-devel python-devel python3-devel

pip3 install psycopg2

参考文章：https://www.jb51.net/article/190392.htm