tornado template调用后台 自定义python 函数

zsy001

　　三种方法
　　1。defining this function in a module and passing the module to tornado.web.Application as the ui_methods argument.
　　in ui_methods.py:

def trim_string(data):
    return data[0:20]
　　in app.py:

import tornado.ioloop
import tornado.web
import ui_methods
classMainHandler(tornado.web.RequestHandler):def get(self):
self.render("main.html")

urls =[(r"/",MainHandler)]
application = tornado.web.Application(urls, ui_methods=ui_methods)if __name__ =="__main__":
application.listen(8888)
tornado.ioloop.IOLoop.instance().start()
　　in main.html:

....
{{ trim_string('a string that is too long............')}}
....
　　2。pass the function in as a template variable

template_vars['mesage']='hello'
template_vars['function']= my_function # Note: No ()
self.render('home.html',**template_vars
)
　　Then in your template you call it like this:

{% my_function('some string')%}
　　3。import functions in Tornado. I think this is the cleanest solution. At the top of your template simply do the following:

{%import lib %}
　　later you can do

{{ trim_string(data)}}