解决pip install psycopg2出错问题

pip install psycopg2出现错误：

Looking in indexes: https://pypi.tuna.tsinghua.edu.cn/simple
Collecting psycopg2
Using cached https://pypi.tuna.tsinghua.edu.cn/packages/84/d7/6a93c99b5ba4d4d22daa3928b983cec66df4536ca50b22ce5dcac65e4e71/psycopg2-2.8.4.tar.gz (377 kB)
ERROR: Command errored out with exit status 1:
 command: /opt/AN/bin/python -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-lkf6b0y5/psycopg2/setup.py'"'"'; __file__='"'"'/tmp/pip-install-lkf6b0y5/psycopg2/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-install-lkf6b0y5/psycopg2/pip-egg-info
  cwd: /tmp/pip-install-lkf6b0y5/psycopg2/
Complete output (23 lines):
running egg_info
creating /tmp/pip-install-lkf6b0y5/psycopg2/pip-egg-info/psycopg2.egg-info
writing /tmp/pip-install-lkf6b0y5/psycopg2/pip-egg-info/psycopg2.egg-info/PKG-INFO
writing dependency_links to /tmp/pip-install-lkf6b0y5/psycopg2/pip-egg-info/psycopg2.egg-info/dependency_links.txt
writing top-level names to /tmp/pip-install-lkf6b0y5/psycopg2/pip-egg-info/psycopg2.egg-info/top_level.txt
writing manifest file '/tmp/pip-install-lkf6b0y5/psycopg2/pip-egg-info/psycopg2.egg-info/SOURCES.txt'

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
<http://initd.org/psycopg/docs/install.html>).

----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

解决方法：

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

补充知识：anaconda 通过pip 安装python psycopg2

1. 【不能在cmd里install】之前一直在 cmd 里conda install psycopg2 ，pip install psycopg2，虽然提示安装成功，但是import时还是会报错提示包不存在。

2. 【在prompt里pip】正确的安装方法是，安装完成 anaconda，进入anaconda prompt，输入命令即可

pip install psycopg2

3. import psycopg2 未报错，安装成功。

来源：https://blog.csdn.net/zhou_438/article/details/104944275