Rich,

How you format data in a Cheetah generated report really depends on the 
source of the data. If you are using a WeeWX generated tag, eg 
$current.outTemp, then you have all the formatting and unit conversion 
options of a WeeWX tag available to you (as linked by Tom). If the data 
comes from some inline python in your Cheetah template then you are 
responsible for formatting the data, for example, if your template had the 
following:

#set $pie_temperature = 22/7

and you wanted to use $pie_temperature in your template then you would be 
responsible for formatting the output, you might do something like:

#set $pie_temperature_2d = round($pie_temperature, 2)

and then use $pie_temperature_2d to display $pie_temperature to two decimal 
places (or you might just have used #set $pie_temperature = round(22/7, 2) 
up front). Bottom line is, formatting/unit conversion etc is your problem, 
not WeeWX'

If your data comes from a Search List Extension (SLE) then it depends on 
what the SLE provides. Let's say the SLE provides a tag $pie_temp that is a 
temperature. If $pie_temp is just a number then just like $pie_temperature 
you need to format it yourself. However, is the SLE is a little more 
sophisticated and provides $pie_temp as a special WeeWX object known as a 
ValueHelper, then $pie_temp has all of the formatting and unit conversion 
abilities of a WeeWX tag such as $current.outTemp. Generally speaking it is 
quite easy to have a SLE return a ValueHelper(), whilst it does make the 
SLE code a little more complex it provides for a much more flexible output. 

At the end of the day a SLE does not allow formatting per se, rather it is 
the type of output from a SLE that determines what formatting/unit 
conversion is available. Have a read of the section Defining new tags 
<http://weewx.com/docs/customizing.htm#defining_new_tags> in the 
Customization Guide, it covers ValueHelpers and SLEs with examples.

Gary

On Sunday, 26 April 2020 14:29:11 UTC+10, rich T wrote:
>
> Thanks I tried your suggestions, but still does not round to the decimal 
> point. I did create a new tag. Do I need to create a new search list 
> extension to allow formatting?
>
> Thanks 
> Rich
>
>
>

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