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Subject: Creating a dict-like class that counts successful and failed key matches
Date: Mon, 30 Jun 2014 09:43:49 -0400
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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>As a diagnostic tool, I would like to create a dict-like class that c=
ounts successful and failed key matches by key. By failed I mean in the sen=
se that a default value was returned vs. an exception raised. By count, I m=
ean by tracking counts for individual keys vs. just total success/failure c=
ounts. The class needs to support setting values, retrieving values, and re=
trieving keys, items, and key/item pairs. Basically anything that a regular=
 dict, I'd like my modified class to do as well.<br><br>Use case: I'm curio=
us to see what key's we're missing that our code is using default to provid=
e and I'm also interested in looking at our high frequency keys as a way to=
 double check our processes.<br><br>Is this a common pattern covered by the=
 standard lib (I don't see anything in collections)?<br><br><span style=3D"=
line-height: 1.25;">I'm looking for ideas on how to implement ... as a subc=
lass of Dict, as a duck-like class offering Dict like methods, other?<br><b=
r></span>I'm also looking for some hints on what magic methods I should ove=
rride to accomplish my goal, eg. beyond __getitem__.<br><br>Thank you,<br>M=
alcolm<br><div>&nbsp;</div>
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