安装cx_Oracle报错python version 3.4 required, which was not found in the registry

在安装https://pypi.python.org/pypi/cx_Oracle/5.2.1#downloads 下载了cx_Oracle，安装时提示python version 3.4 required, which was not found in the registry，按照字面的理解，一个是在注册表中没有找到python相关的信息，如果是机器上安装了多个版本的python，那意思就是没有找到3.4版本的信息。在安装https://pypi.python.org/pypi/cx_Oracle/5.2.1