[EMAIL PROTECTED] wrote:
> I need to look at two-byte pairs coming from a machine, and interpret the
> meaning based on the relative values of the two bytes. In C I'd use a switch
> statement. Python doesn't have such a branching statement. I have 21
> comparisons to make, and that many if/elif/else statements is clunky and
> inefficient. Since these data are coming from an OMR scanner at 9600 bps (or
> faster if I can reset it programmatically to 38K over the serial cable), I
> want a fast algorithm.
>
> The data are of the form:
>
> if byte1 == 32 and byte2 == 32:
> row_value = 0
> elif byte1 == 36 and byte2 == 32:
> row_value = "natural"
> ...
> elif byte1 == 32 and byte2 == 1:
> row_value = 5
> elif byte1 == 66 and byte2 == 32:
> row_value = 0.167
>
> There are two rows where the marked response equates to a string and 28
> rows where the marked response equates to an integer (1-9) or float of
> defined values.
>
> Suggestions appreciated.
>
> Rich
>
> --
> Richard B. Shepard, Ph.D. | Author of "Quantifying
> Environmental
> Applied Ecosystem Services, Inc. (TM) | Impact Assessments Using Fuzzy
> Logic"
> <http://www.appl-ecosys.com> Voice: 503-667-4517 Fax: 503-667-8863
Use a dictionary:
byte_values = {
(32,32) : 0,
(36,32) : 'natural',
(32,1 ) : 5,
}
row_value = byte_values[byte1,byte2]
--
- Justin
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