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Subject: Re: Creating a dict-like class that counts successful and failed key matches
Date: Mon, 30 Jun 2014 10:10:17 -0400
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After some additional research, it looks like I may have even
more options to consider including using a UserDict mixin.



I think I've identified another magic method to subclass ...
__missing__.





----- Original message -----

From: [1]python@bdurham.com

To: [2]python-list@python.org

Subject: Creating a dict-like class that counts successful and
failed key matches

Date: Mon, 30 Jun 2014 09:43:49 -0400



As a diagnostic tool, I would like to create a dict-like class
that counts successful and failed key matches by key. By failed
I mean in the sense that a default value was returned vs. an
exception raised. By count, I mean by tracking counts for
individual keys vs. just total success/failure counts. The
class needs to support setting values, retrieving values, and
retrieving keys, items, and key/item pairs. Basically anything
that a regular dict, I'd like my modified class to do as well.



Use case: I'm curious to see what key's we're missing that our
code is using default to provide and I'm also interested in
looking at our high frequency keys as a way to double check our
processes.



Is this a common pattern covered by the standard lib (I don't
see anything in collections)?



I'm looking for ideas on how to implement ... as a subclass of
Dict, as a duck-like class offering Dict like methods, other?



I'm also looking for some hints on what magic methods I should
override to accomplish my goal, eg. beyond __getitem__.



Thank you,

Malcolm



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<body><div>After some additional research, it looks like I may have even more options to consider including using a UserDict mixin. <br></div>
<div>&nbsp;</div>
<div>I think I've identified another magic method to subclass ... __missing__.<br></div>
<div>&nbsp;</div>
<div>&nbsp;</div>
<div>----- Original message -----<br></div>
<div>From: <a href="mailto:python@bdurham.com">python@bdurham.com</a><br></div>
<div>To: <a href="mailto:python-list@python.org">python-list@python.org</a><br></div>
<div>Subject: Creating a dict-like class that counts successful and failed key matches<br></div>
<div>Date: Mon, 30 Jun 2014 09:43:49 -0400<br></div>
<div>&nbsp;</div>
<div>As a diagnostic tool, I would like to create a dict-like class that counts successful and failed key matches by key. By failed I mean in the sense that a default value was returned vs. an exception raised. By count, I mean by tracking counts for individual keys vs. just total success/failure counts. The class needs to support setting values, retrieving values, and retrieving keys, items, and key/item pairs. Basically anything that a regular dict, I'd like my modified class to do as well.<br></div>
<div>&nbsp;</div>
<div>Use case: I'm curious to see what key's we're missing that our code is using default to provide and I'm also interested in looking at our high frequency keys as a way to double check our processes.<br></div>
<div>&nbsp;</div>
<div>Is this a common pattern covered by the standard lib (I don't see anything in collections)?<br></div>
<div>&nbsp;</div>
<div><span style="line-height: 1.25;">I'm looking for ideas on how to implement ... as a subclass of Dict, as a duck-like class offering Dict like methods, other?</span><br></div>
<div>&nbsp;</div>
<div><span style="line-height: 1.25;"></span>I'm also looking for some hints on what magic methods I should override to accomplish my goal, eg. beyond __getitem__.<br></div>
<div>&nbsp;</div>
<div>Thank you,<br></div>
<div>Malcolm<br></div>
<div>&nbsp;</div>
<div>--<br></div>
<div><a href="https://mail.python.org/mailman/listinfo/python-list">https://mail.python.org/mailman/listinfo/python-list</a><br></div>
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