This makes it hazardous to do the following:

fs = cgi.FieldStorage(...)
if fs:
 ...

Suggestions:

1)  Fix __len__; sorry, but I don't know how.

2) Create FieldStorage.__nonzero__; a hack.

3) ?

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As far as I can tell, cgi.FieldStorage.__len__ only raises a
TypeError if the FieldStorage is not indexable. It's
reasonable not to support len() on an unindexable FieldStorage.

I'm just wondering why you would want to do:

fs = cgi.FieldStorage(...)
if fs:
...

Defining __nonzero__ seems reasonable if there's a reason
for testing a FieldStorage for truth value.

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For a code snippet please look at:

http://mail.python.org/pipermail/python-list/2004-August/235988.html

AFAIK, cgi.FieldStorage is meant to either (sort of) 'be' a
list or a
file after having parsed the request.  So one could possibly
take the
builtin file object as kind of evidence:

>>> f = file('/etc/passwd')
>>> len(f)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
TypeError: len() of unsized object
>>> if f:
...     print 'yes'
... else:
...     print 'no'
...
yes
>>>

I don't see the bug here.