[Python-bugs-list] [ python-Bugs-676072 ] rfc822.Message() doesn't support __contains__() (+patch)

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Bugs item #676072, was opened at 2003-01-28 08:32
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Category: Python Library
Group: Python 2.2
Status: Open
Resolution: None
Priority: 5
Submitted By: Michal Vitecek (fufsource)
Assigned to: Barry A. Warsaw (bwarsaw)
Summary: rfc822.Message() doesn't support __contains__() (+patch)

Initial Comment:
class rfc822.Message() should behave like a dictionary
but it doesn't define method __contains__() so it's not
possible to use form:

   'header' in messageInstance

attached is a simple patch that fixes this.

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>Comment By: Barry A. Warsaw (bwarsaw)
Date: 2003-01-30 22:41

Message:
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It's not entirely clear to me that Messages should have
dictionary semantics, or that you should be able to say
"header in msginst".  I don't think I'd want those semantics
for email.Message.

Messages are more than just a collection of their headers. 
Why wouldn't __contains__ test for a subpart in a message
tree, or for some text in the body of the message?  Also, in
email.Message, __getitem__ etc don't have dict semantics on
purpose.


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Comment By: Raymond Hettinger (rhettinger)
Date: 2003-01-30 18:40

Message:
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I've attached my own version of this patch for Py2.3.
The same solution was used for shelve so that a
single minimal intervention keeps the module
fully synced with mapping interface.  I know this
module is superceded but it doesn't hurt to sync-up
its interface for those who still use it.

Barry, if it meets your approval please reassign
back to me.  

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