20171216 安装flask时 mod-wsgi 对python的requirement

Python Requirements

And Python 2.X version from Python 2.3 onwards can be used. Python 3.0 and later will only be able be used with mod_wsgi 3.0 when released. The version of Python being used must have been compiled with support for threading. On Linux systems, if Python has been installed from a package repository,you must have installed the corresponding Python "dev" package as well.Python should preferably be available as a shared library. If this is not the case then base runtime memory usage of mod_wsgi will be greater and conflicts with mod_python can occur causing Apache to crash if both Apache modules are loaded at the same time.