Solving Error: pg_config executable not found psycopg2 install

On my mac machine, I tried to install a new python library with psycopg2 in it, I got pg_config error, here’s how I solve this error

Case: When I try to add a new package on my computer that has psycopg2 library, it shows me this error

 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.
..

How I solve it

On mac, I need to install postgre first, we can install it with homebrew

brew install postgresql

Then try to install any package, now the error will be gone