Help With Errors in my script! Is there a limited number of functions you can put in a script?

Question

I got an undefined function error. not sure why? if you run it and get time limit exceeded it will work fine. any advice?
https://code.sololearn.com/wvalxIl255O0/?ref=app.

Update 10-11-17. so I have ran the same code on my own server as well as another app. and it worked fine. is there some kind of limit for functions in sololearn?

Answer 1

Uncaught Reference: "letter" is not defined.

Answer 2

print ("I am Vengat")
Thanks for the response!

why do I get that error? I thought I did defined the letters when I made each function for each button. as well as I have made placeholders for each result of each button press.

If it's not defined then why if I get time limit exceeded error it works fine?
Sorry I just don't understand. and I would like to.