[prog] Converting definitions into 'on the fly' code...
Rasjid Wilcox
rasjidw at openminddev.net
Sat May 8 19:26:24 EST 2004
On Friday 07 May 2004 08:37, Conor Daly wrote:
> "Does the sum of minute by minute rainfall amounts equal the hourly
> rainfall value"
>
> as:
>
> rrr[h] = sum(r[0]:r[59])
I have done a simple application that implements this test in a generic and
extendable way.
The test is written as:
abs(rrr - self.sumOverDate('r', 'minute', hour, -1, 0)) < 0.01
The python code is only 130 lines - which is not long but I was not sure if I
should post it directly to the list or not, so instead the code and mysql
test data is at
http://www.openminddev.net/files/python/on_the_fly_formulas/
Feautures:
* New tests can be defined in a single line.
* New 'custom functions' (like the sumOverDate function) are very easy to
write, and any inbuilt python function (like abs) is automatically available.
Note: No security precautions have been implemented in the code. New test
functions should be written by trusted users only.
-----------
Now, having spent all day playing with someone else's problem[1], I should
solve some of my own. :-)
Cheers,
Rasjid.
[1] But it was a fun problem! The ones I have to deal with at the moment are
boring. It is also a good example of why I like Python as a language.
--
Rasjid Wilcox
Canberra, Australia (UTC +10 hrs)
http://www.openminddev.net
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