How can serialize a GPIO list to json?

Question

I have the following setup

LEDS = {"green": 16, "red": 18}

@app.route('/leds/', methods=["GET"])
def api_leds_state():
    return {"green": GPIO.input(LEDS["green"]), "red": GPIO.input(LEDS["red"])}

which returns the pins state

{
    "green": 0,
    "red": 0
}

Unfortunately the code above is hardcoded. How can i get the desired json response with a loop or serialization or something?

Answer 1

Not exactly sure that's what you're asking for, but here's a dictionary comprehension to overcome the hardcoded keys in your return dict:

return {color:GPIO.input(pin) for color, pin in LEDS.items()}

Iterating over LEDS.items() gives you both the key and value of a pair in LEDS, which is what you need to create each new pair in your result dict.