python安装psycopg2报错’Error: pg_config executable not found‘

在使用 pip install psycopg2 命令安装时，报了以下错误。

Looking in indexes: http://mirrors.aliyun.com/pypi/simple/
Collecting psycopg2
  Downloading http://mirrors.aliyun.com/pypi/packages/23/7e/93c325482c328619870b6cd09370f6dbe1148283daca65115cd63642e60f/psycopg2-2.8.2.tar.gz (368kB)
     |████████████████████████████████| 368kB 13.1MB/s 
    ERROR: Complete output from command python setup.py egg_info:
    ERROR: running egg_info
    creating pip-egg-info/psycopg2.egg-info
    writing pip-egg-info/psycopg2.egg-info/PKG-INFO
    writing dependency_links to pip-egg-info/psycopg2.egg-info/dependency_links.txt
    writing top-level names to pip-egg-info/psycopg2.egg-info/top_level.txt
    writing manifest file '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
    ).
    
    ----------------------------------------
ERROR: Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-install-nomas_kt/psycopg2/

在查阅了许多中文文档后，不是说安装二进制版 psycopg-binary ，就是要求在本地安装postgresql数据库，就很麻烦，且很扯。

在查看了官方文档之后，文章明确提到了 psycopg-binary 和 psycopg 的区别，以及安装需要的依赖包。

psycopg vs psycopg-binary

psycopg-binary软件包旨在让初学者开始使用Python和PostgreSQL，而无需满足构建要求。

如果您是依赖于psycopg2的已发布包的维护者，则不应将psycopg2二进制文件用作模块依赖项。对于生产使用，建议您使用源分发。

依赖项

• gcc
• python3-devel
• libpq-dev（pg_config在这个包里）

所以针对找不到pg_config，应该首先安装 libpq-dev ，而不是曲线救国去安装 psycopg-binary

ubuntu



 

apt install libpq-dev

centos



 

yum install libpq-devel.x86_64

macOS



 

最后再安装

pip install psycopg2