Global function code does not work in Python

Question

This is the code on the book I`m reading:

>>> var=99
>>> def funct1():
    global var
    var+=1

>>> var
100

but when I try to run this code on my pc this happens:

>>> var=99
>>> def funct1():
    global var
    var+=1

>>> var
99

Does anyone know why this happens? My book is about Python 3.3 and after and I`m using Python version 3.8.3 so it should be ok...

Answer 1

I am not sure about the context of the book. But you should first call the function for var to change.

Like this:

var=99
>>> def funct1():
    global var
    var+=1

>>> funct1()
>>> var
100