>>> 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'

Iterating over an rfc822 message (above done from 
urllib2) causes an exception. Could be fixed by returning 
an iter(self.dict) from the __iter__ method.

This bug looks similar to bug 1017329.

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This seems like a reasonable feature request.  Though I
don't know if it makes sense to improve a module that is
slated for deprecation per PEP 4.

If accepted, I would subclass from UserDict.DictMixin to
complete the dictionary iterface including __iter__.  

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See attached patch.

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It doesn't seem right to me to inherit from UserDict since a
Message is definitely /not/ a dictionary.  E.g. it may have
multiple occurances of the same header.

I'm fine with adding an __iter__ if you want because even
though rfc822 is slated for deprecation, unfortunately there
are still parts of the stdlib that haven't been rewritten to
use the email package.

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Fixed.
See Lib/rfc822.py 1.78.

Added only the __iter__ method.