本文介绍了在Mac OSX和CentOS上安装psycopg2时遇到'pg_config executable not found'错误的解决方法。针对不同情况，提供了详细的步骤，包括安装postgresql，配置环境变量，以及使用pip重新安装psycopg2。
1安装psycopg2
PostgreSQL database adapter for the Python programming language. Its main features are the complete implementation of the Python DB API 2.0 specification and the thread safety (several threads can share the same connection). It was designed for heavily multi-threaded applications that create and destroy lots of cursors and make a large number of concurrent “INSERT”s or “UPDATE”s.
下载psycopg2 下来，解压，到其所在文件目录下执行
sudo python setup.py install报错：
2环境
- Mac OSX 10.11.2
- python 2.7
- 安装有 pgAdmin3.app
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