reading live numbers with python

I am new to coding and only 13. I was just hoping someone could tell me if I can print a some text if the dB level got over a certain level, I was thinking you could get it from here

if RMSch1 > 0.000001:                                     
       txt = str(5 * math.log10(RMSch1)) + "000000"
       txt = txt[:6] + " dB"
   else:
       txt = "No signal "

thank you