Parsing from string not works anymore

What steps will reproduce the problem?
2. feedparser.parse(response.content)

What version of the product are you using? On what operating system?
5.1, python 2.5.2, Google App Engine

Please provide any additional information below.
You have bug in code which not allow to parse string to feed - :

Stack:

1. def parse(url_file_stream_or_string, etag=None, modified=None, agent=None, 
referrer=None, handlers=None, request_headers=None, response_headers=None):
...
        f = _open_resource(url_file_stream_or_string, etag, modified, agent, referrer, handlers, request_headers)
...

2. def _open_resource(url_file_stream_or_string, etag, modified, agent, 
referrer, handlers, request_headers):
...
# HERE IS BUG! (Unhandled exception)
    try:
        return open(url_file_stream_or_string, 'rb')
    except IOError:
        pass

...

It not throws IOError - you should validate parameters not use exceptions to 
validate since it not designed for validation - it is quick risky way but 
slowing development:

{'bozo': 1,
 'bozo_exception': TypeError('_getfullpathname() argument 1 must be (buffer overflow), not str',),
 'entries': [],
 'feed': {}}

Original issue reported on code.google.com by Cezary.W...@gmail.com on 25 Feb 2012 at 8:33

Start by reproducing feedparser.parse(response.content) with the reported Python 2.5.2 and Google App Engine context. Read parse and _open_resource, especially the open(url_file_stream_or_string, 'rb') path. Done means a string feed is parsed without the reported TypeError and without an empty result caused by that exception.