I need Increment and Decrement service for values

[Bibyte]

I need Increment and Decrement service for float (integer) values

for example: if it 4 -call Increment service with step parametr = 1 will change value to 5. With step value 0.1 - change value to 4.1

[Snuffy2]

This is probably best done through an automation, script, or template using the variable.update_sensor service.

[seanmccabe]

I do this for incrementing

plays: "{{ 1 + state_attr(variable, 'plays')|int(1) }}"