So, I thought you could use variables in python but................. o.o

Question

Hi again fellows :)

So I have this code i've made up, wich is step one to a home-made little calculator.

It is supposed to work, but my while loop seems to consider that my variables are not declared, and I really don't get why o.o

so my code is here : https://code.sololearn.com/cFS7YVKQ4fcP

and I enter 15+25-30 for the testing (wich is supposed to print 10, logically.

But instead i get this message :
>>>>>>>>
Traceback (most recent call last):
File "..\Playground\", line 69, in <module> Add_Sub()
File "..\Playground\", line 12, in Add_Sub while counter<=len(base_calc):
UnboundLocalError: local variable 'counter' referenced before assignment
<<<<<<<<

But why in Pete's name do have I this error showing up ? I really don't get it :(

Answer 1

You complicated yourself with poor structured code.

1st error : You misused attribute 'base_calc'. You get input from user (which is calculation string) and assign it to **global** base_calc. However, you use **local** base_calc in function Add_Sub(). You should'nt define global variable if you want to use local variable and vice visa.

2nd error : Just i said above, your code is complicated with unnecessary code lines. You become don't know what you are doing.

A little piece of advice: Avoid using global variable as much as you can in your code. (just know global persist until program end, while local end with local(i.e in your case Add_Sub function) )

Here's your code (Cleaner version)

https://code.sololearn.com/cG52Fj22r3pd/?ref=app

Answer 2

ok.... 🤔 thank you all for your time, there's a lot of thinking to do !

I've worked a lot on C lately and clearly the philosophy is really different ^^'

edit: no it's not, I Just mentaly placed my 'main' in python above everything when in fact it is Just like in C, so Just above the first who's not à function Def o.o
thanks again, now I totally get it ❤

Answer 3

python has a default function for what u r trying to do.check my code
sorry but ur code has too many mistakes
https://code.sololearn.com/cYiUK7n4QGVL/?ref=app

Answer 4

well, I'm trying to make an autoderminate calculator, where you just type whatever calculation you want and get a response.

kind of like in Excel...

but even tho I'm making modifications I keep discovering New errors.

now it's the index of counter Who doesn't fit, I don't get it o.o

Answer 5

you might try and declare the variables in the function and make the function take in the necessary calculation as an argument
p.s. your code is weird af

Answer 6

Currently, you are setting base_calc equal to an empty string then trying to access individual offsets based on counter.