[CentralOH] Python Puzzler -- The little max bug

[Eric Floehr]

One clarification, in the parse_* functions, "f" should be "lines" but it
doesn't really matter for this puzzle.



On Tue, Mar 10, 2015 at 7:38 PM, Eric Floehr <eric at intellovations.com>
wrote:

> The following code has a bug.
>
> The code takes input and generates a dictionary of dictionaries of
> dictionaries of the following form:
>
> {
>   'hour1':
>     { 'formula_type1': { ... },
>       'formula_type2': { ... },
>        ...
>     },
>   'hour2':
>     { 'formula_type1': { ... },
>       'formula_type2': { ... },
>        ...
>     },
>    ...
> }
>
> The symptoms were that formula types MINT, CLOUD, and PRECIP were showing
> up in the final dictionary (hoursdict), but MAXT was not. For any set of
> lines and hour all the formula types showed up exactly once.
>
> What was the bug, and why was MAXT the only formula type affected?
>
>
> ##########################################
>
> hoursdict = {}
>
> for line in lines:
>    formula_type = ### Code to determine formula_type ###
>    hour = ### Code to determine hour ###
>
>     try:
>         hourdict = hoursdict[hour]
>     except:
>         hourdict = {}
>         hoursdict[hour] = {}
>
>     hourdict[formula_type] = {}
>
>     if formula_type in ('MAXT','MINT'):
>         parse_h1h4_formulas(f, hourdict[formula_type])
>     elif formula_type == 'CLOUD':
>         parse_cloud_formulas(f, hourdict[formula_type])
>     elif formula_type == 'PRECIP':
>         parse_precip_formulas(f, hourdict[formula_type])
>
> return hoursdict
>
> ##########################################
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/centraloh/attachments/20150310/5e19979e/attachment.html>