How to store user input as a variable and compare it to already existing variables

Question

Hello, im trying to programm a bank system with python using PyQt5 and SQLite3. I designed my GUI and transformed it into a python file. But now i dont know how to store the user input from the LineEdit area as a variable, Because i need to compare them to the already existing Datas and then logging in if they are correct. I hope its clear what i want to say. Thank you!
These are the codes. One is for the GUI and the other to connect buttons etc. To the functions.
https://code.sololearn.com/cKtXZw5U21zu/?ref=app
https://code.sololearn.com/cHX09nvGVq6S/?ref=app

Answer 1

Have you tried using vars()?

Answer 2

For example:
# input is ab
vars()[input()] = 1234
print(ab)
#Output will be 1234

Answer 3

Doesn't vars() only return variables if they are given? But in my case i need to store them first in variables, or not? Maybe you could explain to me, how to use it

Answer 4

If i understand you right, with vars() i can assign a variabel a new value? I will take a look if this will work and how i can apply it at my code.