Python3 pip命令报错：Fatal error in launcher: Unable to create process using '"'

一、问题

环境：win7 同时安装python2 和 python3

执行pip 命令报错：Fatal error in launcher: Unable to create process using '"'

二、解决方案

采用命令：python3 -m pip install psycopg2

或者

　　　　    python3 -m pip install psycopg2

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