Question

I’m trying to get a troublesome python app of mine to work. I’ve just overcame a problem via help of @unutbu here.

My next problem is happenig to be a bit weird, the stack trace shows nothing related to my code:

Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/web.py-0.37-py2.7.egg/web/application.py", line 239, in process
    return self.handle()
  File "/usr/local/lib/python2.7/dist-packages/web.py-0.37-py2.7.egg/web/application.py", line 230, in handle
    return self._delegate(fn, self.fvars, args)
  File "/usr/local/lib/python2.7/dist-packages/web.py-0.37-py2.7.egg/web/application.py", line 419, in _delegate
    cls = fvars[f]
KeyError: u'Home'

The only script I call a web.py function is this:

#Application/App.py
import web
class AppInstance(object):
    def __init__(self):
        from Views import Home
        self.urls = (
                "/", "Home",
                )
        self.app = web.application(self.urls, globals())
    def run(self):
        self.app.run()

This guy is called from a script a directory upper in the filesystem:

#start.py
from Application import App
app = App.AppInstance()
app.run()

If you want, I can copy how directory layout look from the question I mentioned above, but I’m not doing it now, as it will cause a lot of mess here (output of tree command). My question is: How can I fix this issue with minimal changes to the directory structure?

---

I thougth adding directory structure of the application should be helpful to those who want to help/who may read this for solving their own problem.

Blog/
├── Application/
│   ├── App.py
│   └── __init__.py
|
├── Engine/
│   ├── Connection/
│   │   ├── __init__.py
│   │   └── MySQLConnection.py
│   ├── Errors.py
│   └── __init__.py
├── __init__.py
├── Models/
│   ├── BlogPostModel.py
│   └── __init__.py
├── start.py
└── Views/
    ├── Home.py
    └── __init__.py

This thing has just started, aims to provide a blogging engine, and helps me implement thing I’ve learnt till today for something complete and useful.

Answer 1

The second argument to web.application must be a dictionary of potential handlers. In your case, you want Home to be in it, but that binding is only in the local variables. Either call locals instead of globals:

import web
class AppInstance(object):
    def __init__(self):
        from Views import Home
        self.urls = (
                "/", "Home",
                )
        self.app = web.application(self.urls, locals())
        #                                     ^^^^^^
    def run(self):
        self.app.run()

or move the import:

import web
from Views import Home # <-- Moved into global namespace
class AppInstance(object):
    def __init__(self):
        self.urls = (
                "/", "Home",
                )
        self.app = web.application(self.urls, globals())
    def run(self):
        self.app.run()