How to invert values ​​in python?

Question

Python

How do I invert a variable like variable x?

x=o
x = not x
print(x)

works, but when I create a function, it doesn't

x=True
def ain():
    x = not x
    print(x)
ain()

Most likely a problem with global and local variables.

Answer 1

1. Pass a variable to the function
2. Return the result from the function
What could be simpler? Well, forget about the use of global variables, beginners do not know how to use them.

Answer 2

For example, like this:

x = True
def ain(_x):
    _x = not _x
    print(_x)
    return _x
x  = ain(x)