How to fix 'refrenced before assignment' in Python ?

Question

I do know exactly know how can I fix this error ... but this is only a part of my code , please show me my mistake :
check = True
def Apply(string , i ,j):
...
cmp_2 = res
if cmp_1 == cmp_2:
check = False
if check == True:
...
And in the last line , the error raises ...tell me to send my complete code , if you need it ...

Answer 1

Just as Lisa pointed out, check is not declared if cmp_1 != cmp_2
The solution is to declare it before testing the condition

check = True
if (cmp_1 == cmp_2):
check = False

Alternatively you can write it in a single line like this

check = cmp_1 != cmp_2

Answer 2

Ali_combination check only exists if cmp_1 == cmp_2 (line 55), so if this statement is not true, it cannot be referenced in the following

the Apple function cannot refer to the check var of line 46

Answer 3

Ore
Lisa
Thanks a lot for your great help 😊👍

Answer 4

Is there a variable named cmp_1 because it is not declared in the code snippet you shared

Answer 5

I think you have to share the complete function body

Answer 6

Ore yep..its already declared .

Answer 7

Ore here you are https://code.sololearn.com/ca12a2311a13/?ref=app

Answer 8

Ore sorry sir ... didn't you figure the bug out ? Im still stuck with it -_-

Answer 9

Lisa I really didnt get it ... what should I change ? The if statement should be included ... otherwise the progarm won't work ..