A couple of Python 'Features'

Michael Foord fuzzyman at gmail.com
Sat Sep 4 12:02:29 CEST 2004


I've come across a couple of 'features' in Python standard libraries -
and I'm not sure if they're meant to be there... or if they're bugs...

One in urllib2 and one in cgi.

>>> from urllib2 import urlopen
>>> a = urlopen('http://www.voidspace.org.uk')
>>> i = a.info()
>>> for entry in i: print entry
Traceback (most recent call last):
  File "<pyshell#11>", line 1, in -toplevel-
    for entry in i: print entry
  File "D:\PYTHON23\lib\rfc822.py", line 390, in __getitem__
    return self.dict[name.lower()]
AttributeError: 'int' object has no attribute 'lower'

and in cgi (a result that happens in live CGI as well as interactive
sessions....) :

>>> import cgi
>>> a = cgi.FieldStorage()
>>> for entry in a: print entry

Traceback (most recent call last):
  File "<pyshell#3>", line 1, in ?
    for entry in a: print entry
  File "C:\PYTHON22\lib\cgi.py", line 550, in __getitem_
    raise KeyError,
 keyKeyError: 0
>>> 

You can get round the cgi bug because :
for entry in a.keys(): print entry
works fine - but it's a bit annoying.

(Admittedly my server has python 2.2, but the urllib2 bug occurs in
Python 2.3.4 as well I think).

Regards,


Fuzzy

http://www.voidspace.org.uk/atlantibots/pythonutils.html



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