Is there any primer type documentation on template variables? Using web examples I have got a few things done, like where a value follows a particular word or phrase, but I am struggling with other formats.
A couple of examples:
I have an SNMP poll for CPU utilisation that returns a value like “55%”, but I need to strip off the “%” in order for HASS to work with it.
Another SNMP poll for temperature returns a value like “21C/70F”, for which I need to strip down to the integer for degrees C.
If value is 55% then this template will extract everything except the last character:
{{ value[:-1] }}
It’s using python’s ability to slice strings:
If value is 20C/70F then this template will split it (at the / character) into a list containing two items. The list is zero-based so the very first item is the zeroth item. The template chooses the zeroth item and gets everything except the last character:
{{ value.split('/')[0][:-1] }}
It is using a python method called split which is inherent to all strings.
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