Im scraping the webserver of a solar inverter. When it produces energy, I get a number, when it doesnt produce energy, there is a string (something like ’ + + + ’ and some weird characters. Im trying to get a template working to return zero is the value is not numeric. I tried this:
- platform: scrape
resource: http://pvserver:[email protected]
select: 'td'
index: 14
name: "Kostal 1 Vermogen"
unit_of_measurement: W
device_class: energy
state_class: measurement
unique_id: Kostal1_vermogen
scan_interval: 60
value_template: >
{% if value is number %}
{{value}}
{% else %}
0
{% endif %}
But it always returns 0. When I just use {{value}}, I do get the correct number during production, but the string otherwise. help?
The following will test if the value’s type is a numeric value (integer or float). If the value is a numeric string like '25' then that’s not integer or float but a string and will fail the test (and your template will report 0).
{% if value is number %}
The following test is a bit more inclusive because it will accept a numeric string as being a number.
Ah, awesome, thanks. Yes, I assume it always is a string, even if a string that represents a number, so thats why my test failed. Ill try the second approach. Can you explain why piping it to is_number behaves differently?
