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

Scope of the variable is local to the block unless defined explicitly using keyword global. There is other way to access the global variable local to a function using globals function

a = 15

def test():
    a = globals()['a']
    a += 10
    print ( a )

test()

Above example will print 25 while keeping the global value intact i.e 15.