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在mac 上安装psycopg2的方法：执行：pip3 install psycopg2-binary。

如果执行pip3 install psycopg2，无法安装psycopg2

报错信息如下：

Collecting psycopg2Using cached psycopg2-2.9.9.tar.gz (384 kB)Preparing metadata (setup.py) ... errorerror: subprocess-exited-with-error× python setup.py egg_info did not run successfully.│ exit code: 1╰─> [23 lines of output]running egg_infocreating /private/var/folders/sn/4zg1p0495lq98d4qtk5qghw40000gn/T/pip-pip-egg-info-12j51cdv/psycopg2.egg-infowriting /private/var/folders/sn/4zg1p0495lq98d4qtk5qghw40000gn/T/pip-pip-egg-info-12j51cdv/psycopg2.egg-info/PKG-INFOwriting dependency_links to /private/var/folders/sn/4zg1p0495lq98d4qtk5qghw40000gn/T/pip-pip-egg-info-12j51cdv/psycopg2.egg-info/dependency_links.txtwriting top-level names to /private/var/folders/sn/4zg1p0495lq98d4qtk5qghw40000gn/T/pip-pip-egg-info-12j51cdv/psycopg2.egg-info/top_level.txtwriting manifest file '/private/var/folders/sn/4zg1p0495lq98d4qtk5qghw40000gn/T/pip-pip-egg-info-12j51cdv/psycopg2.egg-info/SOURCES.txt'Error: pg_config executable not found.pg_config is required to build psycopg2 from source.  Please add the directorycontaining pg_config to the $PATH or specify the full executable path with theoption: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.