Static code analysis and corrections

backend/app.py

@@ -1,16 +1,18 @@
 # app.py - main backend program
+'''Main TeraHz backend program'''
 # All code in this file is licensed under the ISC license, provided in LICENSE.txt
-from flask import Flask, redirect, url_for, request
+from flask import Flask
 import flask
 import sensors
-import json
+
 app = Flask(__name__)
-s=sensors.Spectrometer(path='/dev/serial0', baudrate=115200, tout=1)
-u=sensors.UVSensor()
-l=sensors.LxMeter()
+s = sensors.Spectrometer(path='/dev/serial0', baudrate=115200, tout=1)
+u = sensors.UVSensor()
+l = sensors.LxMeter()
 
 @app.route('/data')
 def sendData():
+    '''Responder function for /data route'''
     response = flask.jsonify([s.getData(), l.getData(), u.getABI()])
     response.headers.add('Access-Control-Allow-Origin', '*')
     return response