All,
I'm trying to write a simple service that creates a new derived measurement
based on values already in the weewx database. Ultimately, I want to get a
running total of the rainfall, but I'm not there yet. Also, not a Python
developer by trade, but I'm trying.
My issue is: when I try to do arithmetic, the variables have, of course, to
be numbers, be it int or float. I'll take the 'pressure' measurement as an
example. Looking into the database, it seems to be a float, but it could
also be a string.
But trying to use it that way, or trying to convert the string into a
float, always gives me errors (could not convert string to float). I've
tried stripping invisible whitespaces from the string (if it is one), but
the error remains.
Here's the relevant code, one of the many I've tried.
So how do I get a weewx-variable into usable form? I'm probably missing
something pretty basic here.
Thanks!
BTW, is there a way to test-run a service file? Like have the python code
run in the weewx-environment?
foo = (float('pressure') * 10)
or
pressure_trim = 'pressure'.strip()
foo = (float(pressure_trim) * 10)
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