>   I'm new to both python and webob.
>   I have just read the doc http://docs.webob.org/en/latest/file-example.html
> and try to reproduce the example.

>   According to the instruction, I wrote my code as follows:

> ************************************************
> from webob import Request, Response
> import os
> import mimetypes

> class FileApp(object):
>    def __init__(self, filename):
>        self.filename = filename

>    def __call__(self, environ, start_response):
>        res = self.make_response(self.filename)
>        return res(environ, start_response)

>    def get_mimetype(self, filename):
>        type, encoding = mimetypes.guess_type(filename)
> # We'll ignore encoding, even though we shouldn't really
>        return type or 'application/octet-stream'

>    def make_response(self, filename):
>        res = Response(content_type=self.get_mimetype(filename)
>                        ,conditional_response=True)
>        res.app_iter = FileIterable(filename)
>        res.content_length = os.path.getsize(filename)
>        return res

> class FileIterable(object):
>    def __init__(self, filename, start=None, stop=None):
>        print start, stop
>        self.filename = filename
>        self.start = start
>        self.stop = stop
>    def __iter__(self):
>        return FileIterator(self.filename, self.start, self.stop)
>    def app_iter_range(self, start, stop):
>        return self.__class__(self.filename, start, stop)

> class FileIterator(object):
>    chunk_size = 4096
>    def __init__(self, filename, start=None, stop=None):
>        print "dddd"
>        self.filename = filename
>        self.fileobj = open(self.filename, 'rb')
>        if start:
>            self.fileobj.seek(start)
>        if stop is not None:
>            self.length = stop - start
>        else:
>            self.length = None
>    def __iter__(self):
>        return self
>    def next(self):
>        if self.length is not None and self.length <= 0:
>            raise StopIteration
>        chunk = self.fileobj.read(self.chunk_size)
>        if not chunk:
>            raise StopIteration
>        if self.length is not None:
>            self.length -= len(chunk)
>            if self.length < 0:
>                # Chop off the extra:
>                chunk = chunk[:self.length]
>        return chunk
>    __next__ = next # py3 compat

> fn = os.path.join(os.curdir, 'test.txt')

> app = FileApp(fn)
> req = Request.blank("/")
> req.range = (0, 5)
> req.app_iter
> print req.get_response(app)
> ***************************************

> But I got,
> Traceback (most recent call last):
>  File "FileServing.py", line 71, in <module>
>    req.app_iter
>  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/
> lib/python2.7/site-packages/webob/request.py", line 1238, in
> __getattr__
>    raise AttributeError(attr)
> AttributeError: app_iter

> After that I removed the req.app_iter, and thing ran normal.

> Could someone explain why me system failed by adding req.app_iter in
> the code ?

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