How to change a variable after it is already defined?

Question

I\'m trying to add or subtract from a defined variable, but I can\'t figure out how to overwrite the old value with the new one.

a = 15

def test():
    a =          


        

Answer 1

You're modifying a variable a created in the scope of the function test(). If you want the outter a to be modified you could do:

a = 15

def test():
    global a
    a = a + 1
    print(a)

test()