Variable does not remain after calling 2nd script and ending loop (Python)

Question

I am running script 2 from script 1 but the output of script 2 is not stored as a variable in script 1.

script1

def main():
    selection = int(raw_input("Enter Selection: "))
    if selection == 1:
        a = 1
        import script2
        result = script2.doit(a)
        print result
        return True

    elif selection == 0:
        return False

while main():
    pass

print result

script 2

def doit(a):
    return a+2

Although result gets printed after an iteration, it is not stored as "result" after I end the loop. print result outside the loop gives the error "NameError: name 'result' is not defined".

Can you please describe your problem a little bit more? What is your expectation? Where should result be stored? — rbf
– rbf, Commented Feb 16, 2018 at 9:17
result is a local var of function main(). If you want to use result outside of main() type 'global result' (without qoutes) in the body of main() — Anvit
– Anvit, Commented Feb 16, 2018 at 9:21

Chuk Ultima · Accepted Answer · 2018-02-16 09:17:50Z

1

It's because a is a local variable. When your main function returns a value, local variables are cleared. You should either pass it as reference or return the value and re-assign to a global variable.

answered Feb 16, 2018 at 9:17

Chuk Ultima

1,0471 gold badge13 silver badges21 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

TYL · Accepted Answer · 2018-02-16 09:37:29Z

1

Adding global result to the main body of main() does the job. Credits to A False Name for the answer. Thanks!

def main():
    global result
    ......

answered Feb 16, 2018 at 9:37

TYL

1,63722 silver badges43 bronze badges

2 Comments

Håken Lid Over a year ago

Using global does work. But it's highly discouraged to use global, because it will make your code very very confusing and hard to debug. Instead, use return to pass back any result you want to use in the calling scope. Also, it's best to keep all imports at the top of the file, and not nested inside functions.

Håken Lid Over a year ago

stackoverflow.com/questions/19158339/…

Collectives™ on Stack Overflow

Variable does not remain after calling 2nd script and ending loop (Python)

2 Answers 2

Comments

2 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

2 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related