werkzeug学习

学习shortly.py
os.path.dirname(file)
获取运行脚本的目录，如果是绝对路径运行，会有完整路径，如果是依相对路径运行就是空

print os.path.join(os.path.dirname(file),’static’)

python /home/dawx/WorkSpace/shortly/shortly.py
》/home/dawx/WorkSpace/shortly/static

cd /home/dawx/WorkSpace/shortly/
python shortly.py

static

def wsgi_app(self,environ, start_response):
environ 变量存储了客户端的环境信息

36进制转换函数
def base36_encode(number):
assert number >= 0, ‘positive integer required’
if number == 0:
```
return '0'
```
base36 = []
while number != 0:
```
number, i = divmod(number, 36)
base36.append('0123456789abcdefghijklmnopqrstuvwxyz'[i])
# print base36
```
return ‘’.join(reversed(base36))

for x in xrange(1,999):
print base36_encode(x)

werkzeug 的使用

使用werkzeug可以对http请求进行响应比如在页面打印 “hello world”

但要打印丰富复杂的html页面需要借助jinja2模版引擎

jinja2 就根据定义好的模版文件渲染个正确的html文档

然后调用 Response类把内容返回给客户端

客户端收到服务器的数据,浏览器呈现出来

werkzeug中的Map()

from werkzeug.routing import Map
self.url_map = Map()

werkzeug.routing中Map()的示例

>>> m = Map([
...     # Static URLs
...     Rule('/', endpoint='static/index'),
...     Rule('/about', endpoint='static/about'),
...     Rule('/help', endpoint='static/help'),
...     # Knowledge Base
...     Subdomain('kb', [
...         Rule('/', endpoint='kb/index'),
...         Rule('/browse/', endpoint='kb/browse'),
...         Rule('/browse/<int:id>/', endpoint='kb/browse'),
...         Rule('/browse/<int:id>/<int:page>', endpoint='kb/browse')
...     ])
... ], default_subdomain='www')

>>> c = m.bind('example.com')
>>> c.build("kb/browse", dict(id=42))
'http://kb.example.com/browse/42/'
>>> c.build("kb/browse", dict())
'http://kb.example.com/browse/'
>>> c.build("kb/browse", dict(id=42, page=3))
'http://kb.example.com/browse/42/3'
>>> c.build("static/about")
'/about'
>>> c.build("static/index", force_external=True)
'http://www.example.com/'

>>> c = m.bind('example.com', subdomain='kb')
>>> c.build("static/about")
'http://www.example.com/about'

[Flask 路由做范围限制](http://liyangliang.me/posts/2014/02/range-validation-in-flask-routing/)