安装python依赖包psycopg2来调用postgresql的操作

本案例的操作系统为linux red hat

在安装python依赖包psycopg之前，你必须需要先安装postgresql数据库的相关组件：

postgresql-devel,postgresql,postgresql-libs这三个组件比较重要。另外，可选组件：postgresql-server

安装上述组件之前，可以用命令来查看你的系统现在是否已经安装了相关组件：

[root@dthost27 ~]# rpm -qa | grep PostgreSQL

如果都没有安装，则可执行命令如下：

[root@dthost27 ~]# yum install postgresql-devel

(安装过程中会顺带安装上postgresql和postgresql-libs组件)

保证依赖组件存在后，就可以使用pip命令安装了：

[root@dthost27 ~]# pip install psycopg2-binary

注：这里安装的是binary格式的psycopg2依赖包，其实安装psycopg2也可以，但是有时候执行pip install psycopg2会报错，而安装psycopg2-binary（编译后）则不会

启动python测试

import psycopg2

补充：安装psycopg2报错_解决方案

报错信息

(python3-virtualenv) [root@vl-bg-anaylsis02 extract_log]# pip3 install psycopg2Collecting psycopg2 Using cached psycopg2-2.8.4.tar.gz (377 kB) ERROR: Command errored out with exit status 1: command: /disk2/extract_log/python3-virtualenv/bin/python3 -c ’import sys, setuptools, tokenize; sys.argv[0] = ’'’'’/tmp/pip-install-2d9wyu3k/psycopg2/setup.py’'’'’; __file__=’'’'’/tmp/pip-install-2d9wyu3k/psycopg2/setup.py’'’'’;f=getattr(tokenize, ’'’'’open’'’'’, open)(__file__);code=f.read().replace(’'’'’rn’'’'’, ’'’'’n’'’'’);f.close();exec(compile(code, __file__, ’'’'’exec’'’'’))’ egg_info --egg-base /tmp/pip-install-2d9wyu3k/psycopg2/pip-egg-info cwd: /tmp/pip-install-2d9wyu3k/psycopg2/ Complete output (23 lines): running egg_info creating /tmp/pip-install-2d9wyu3k/psycopg2/pip-egg-info/psycopg2.egg-info writing /tmp/pip-install-2d9wyu3k/psycopg2/pip-egg-info/psycopg2.egg-info/PKG-INFO writing dependency_links to /tmp/pip-install-2d9wyu3k/psycopg2/pip-egg-info/psycopg2.egg-info/dependency_links.txt writing top-level names to /tmp/pip-install-2d9wyu3k/psycopg2/pip-egg-info/psycopg2.egg-info/top_level.txt writing manifest file ’/tmp/pip-install-2d9wyu3k/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.解决方案 For ubuntu

sudo apt-get install libpq-dev python3-dev解决方案 For Fedora/Centos

yum install -y postgresql10yum install postgresql-libs python3-devel postgresql-develyum install gcc

以上为个人经验，希望能给大家一个参考，也希望大家多多支持好吧啦网。如有错误或未考虑完全的地方，望不吝赐教。