double calculation in function

Question

Why does this function doesn't work?

int_myApples = 4    
int_yourApples = 13    
int_TotalApples = int_myApples + int_yourApples    

def giveApple():    
    int_yourApples += 1    
    int_myApples -=1    
    
giveApple()     
    
print("If I give you one of my apples,you have {} and I have {} apples.".format(int_yourApples,int_myApples))`

If I do the same without putting it into a function it just works.

int_yourApples += 1    
int_myApples -=1    
    
print("If I give you one of my apples, you have {} and I have {} apples.".format(int_yourApples,int_myApples))

Any reason why?

You haven't mentioned the error message you get, but if you searched it on here you would find lots of questions and answers explaining it. — khelwood, Sep 18 '20 at 22:00
Duplicate: [Don't understand why UnboundLocalError occurs](https://stackoverflow.com/q/9264763/4518341) — wjandrea, Sep 18 '20 at 22:02

score -1 · Accepted Answer · answered Sep 18 '20 at 22:01

-1

A function needs global variables to call outside of the function, you can do it like this.

def giveApple():    
    global int_yourApples
    global int_myApples

    int_yourApples += 1    
    int_myApples -=1

answered Sep 18 '20 at 22:01

StarbuckBarista

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This works, but [global variables are generally bad practice](https://stackoverflow.com/q/19158339/4518341), so it would be better to mention alternatives first. – wjandrea Sep 18 '20 at 22:02
"For smaller applications, global variables are not a problem." Though yes your point does have validity. – StarbuckBarista Sep 18 '20 at 22:05
1

Small apps tend to grow into large apps if they're useful enough. So those globals tend to cause problems down the road. – Sep 18 '20 at 22:59
Your point does have merit. – StarbuckBarista Sep 18 '20 at 23:58

double calculation in function

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