Log data from the `sensors` program to a json file

sensors_log.py

import sh
import json
from time import sleep

def transform_readings(readings, path=''):
    """Transform all readings from `sensors` into a dict that contains just sensor names and sensor values""" 
    results = {}
    
    # not all values are dicts
    if not isinstance(readings, dict):
        return {}
    
    for k, v in readings.items():
        current_path = path + k + '.'
        if k.endswith('_input'):
            results[current_path.rstrip('.')] = float(v)
        # recurse
        results.update(transform_readings(v, path=current_path))
        
    return results

while True:
    # call the sensors CLI program
    readings = sh.sensors(j=True)
    readings_json = json.loads(readings)

    readings_inputs = transform_readings(readings_json)
    readings_inputs['date'] = sh.date("+%H:%M:%S").strip()

    with open('readings.json', 'a') as f:
        json.dump(readings_inputs, f)
    sleep(3)