CODEWITHSUNDEEP
pythondatabasefirebase
user2758113
user2758113

Reputation: 1049

Python how to check if database value is the same

Hello I have this firebase set up that is connected to a raspberry pi that speaks text according the firebase database. I have the function running every 5 seconds, and I'd like to check if there is a new message. I store the time of each message in the database, and the way i have it going now is that it's checking to see if the time is the same on new and old messages.

My two questions are:

Is there a better way to checking the messages time, to see if messages are new?

How can I fix this code so I am not getting a UnboundLocalError: local variable 'the_time' referenced before assignment" error

Here is my code

import time
import subprocess
from firebase import firebase
firebase = firebase.FirebaseApplication('----', None)

message = firebase.get('/message', None)
name = firebase.get('/name', None)
the_time = firebase.get('the_time',None)
speak_message = message+" from "+ name

def showmessage():
        message=firebase.get('/message',None)
        name=firebase.get('/name',None)
        current_time = firebase.get('/the_time',None)
        speak_message=message+' from '+name

        #this is to set the audio jack on raspi
        subprocess.call(['amixer','cset','numid=3','1'])

        if current_time == the_time:
                #message is NOT new
                print 'message is NOT new'

        elif current_time != the_time:
                #message IS new
                #Shell script to run text-to-speech
                subprocess.call(['/home/pi/./speech.sh',speak_message])
                the_time = current_time


        time.sleep(5)
while True:
        showmessage()

Upvotes: 1

Views: 1111

Answers (1)

aIKid
aIKid

Reputation: 28292

Your script should works just fine, except one little, tiny mistake in this part:

elif current_time != the_time:
    #message IS new
    #Shell script to run text-to-speech
    subprocess.call(['/home/pi/./speech.sh',speak_message])
    the_time = current_time

You're assigning to the_time, which is a global variable. In your showmessage function, you didn't declare it, right?

To fix this, you must declare the_time to be a global variable.

def showmessage():
    global the_time
    #all other stuff

That's all you need to change :) Hope this helps!

Upvotes: 1

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