ideas for Flask and Python3 and Bots

#!/usr/bin/python3

from PySabertooth import Sabertooth, Range
from flask import Flask, render_template
import serial
from time import sleep
import decimal

# on the beaglebone related boards, use a known, working UART port on the headers.

# For instance, attach P9_21 to S1 on the sabertooth 2 x 12 and attach GND on the sabertooth to GND on your BBB.
# "/dev/ttyS2" has changed in time. Check for changes...

saber = Sabertooth("/dev/bone/uart/2", baudrate=9600, timeout=0.1)
ser = serial.Serial("/dev/bone/uart/1", baudrate=9600, timeout=0.1)

# start and enable a service, start a cron job, or make an executable .sh file for use when booting into this file.

app = Flask(__name__)
@app.route("/")
@app.route("/<gar>")
@app.route("/<state>")
class dire:
    def siri(gar=None):
        try:
            if gar == '6' or gar >= '7':
                data = ser.read_until(b'\r')
                ranger = data[1:-1]
                ranger = bytes.decode(ranger)
                ranger = str(ranger)
                print("distance = ", ranger, "inches away..")
                sleep(3)
            sleep(0.1)

        except serial.SerialException as e:
            print(f"Error opening serial port: {e}")
            raise

    def sab(state=None):
        if state == "F":
            print ("Robot Moving Forward")
            try:
                saber.drive(1, 70)
                saber.drive(2, 70)
            except ranger <= '5':
                print("Accessing AI...")
                saber.drive(1, -5)
                saber.drive(2, -5)
                pass

        if state == "R":
            print ("Robot Turning Right")
            try:
                saber.drive(1, 75)
                saber.drive(2, 25)
            except ranger <= '5':
                print("Accessing AI...")
                saber.drive(1, -5)
                saber.drive(2, -5)
                pass

        if state == "L":
            print ("Robot Turning Left")
            try:
                saber.drive(1, 25)
                saber.drive(2, 75)
            except ranger <= '5':
                print("Accessing AI...")
                saber.drive(1, -5)
                saber.drive(2, -5)
                pass

        if state == "S":
            print ("Robot Stopped")
            try:
                saber.drive(1, 0)
                saber.drive(2, 0)
            except ranger <= '5':
                print("Accessing AI...")
                saber.drive(1, -5)
                saber.drive(2, -5)
                pass

        if state == "START":
            print("Starting from a stop...")
            saber.drive(1, True)
            saber.drive(2, True)

        if state == "REV":
            print("Reversing")
            try:
                saber.drive(1, -55)
                saber.drive(2, -55)
            except ranger <= '5':
                print("Accessing AI...")
                saber.drive(1, 5)
                saber.drive(2, 5)
                pass

        if state == "SPIN":
            print("Loops...")
            saber.drive(1, -55)
            saber.drive(2, 55)

        template_data = {
            "title" : state,
        }
        return render_template("Saber.html", name=(state, gar))

    if __name__=="__main__":
        app.run(host="0.0.0.0", port=5000, debug=True)



# ERROR HERE - - [26/Feb/2025 22:16:58] "GET / HTTP/1.1" 404 -