首先系统版本是ubuntu 15.04,系统默认安装了两个版本的python，
sudo python web2py.py
默认会调用python2.7版本来执行
会提示
pydo@planpls:/var/python/web2py$ sudo python web2py.py
web2py Web Framework
Created by Massimo Di Pierro, Copyright 2007-2015
Version 2.11.2-stable+timestamp.2015.05.30.16.33.24
Database drivers available: sqlite3, imaplib, pymysql, pg8000
WARNING:web2py:GUI not available because Tk library is not installed
choose a password:please visit:
http://127.0.0.1:8000/
use "kill -SIGTERM 6240" to shutdown the web2py server
提示 WARNING:web2py:GUI not available because Tk library is not installed
解决办法：
sudo apt-get install python-tk
然后就可以启动web2py的图形界面来，其中web2py启动参数可以配置不使用gui界面
pydo@planpls:/var/python/web2py$ sudo python web2py.py
web2py Web Framework
Created by Massimo Di Pierro, Copyright 2007-2015
Version 2.11.2-stable+timestamp.2015.05.30.16.33.24
Database drivers available: sqlite3, imaplib, pymysql, pg8000
please visit:
http://127.0.1.1:8000/
starting browser...
大家可以看到右侧打图形界面，以前一直不能解决web2py写打程序从外部不能访问打问题，wamp可以切换服务器是否在线，现在看了图形界面才知道可以设置Server IP是否公开的啊，看来gui界面也有直观易懂的好处啊，启动参数怎么写不知道，不过gui形式启动，参数设置不生效果
x选择：Public(0.0.0.0)外网可以访问，这种机制很棒
至此，困扰三四周的解决，虽然笨了点，可还是解决了呀
>>> python web2py.py -h
Usage: python web2py.pyweb2py Web Framework startup script. ATTENTION: unless a password
is specified (-a 'passwd'), web2py will attempt to run a GUI.
In this case command line options are ignored.
