Link to global primitives and objects

Question

Can anyone explain the following result in Python?

When I run the following snippet of code, Python throws an error stating that before the link assignment was specified x:

x = 1

def increase_x():
    x += 1

increase_x()

The solution, of course, should include a line global xafter the function declaration for increase_x.

However, there is no error running this next snippet of code, and the result is what you expect:

x = [2, -1, 4]

def increase_x_elements():
    for k in range(len(x)):
        x[k] += 1

increase_x_elements()

Is it because integers are primitives in Python (not objects), and so xin the first fragment is it a primitive stored in memory, and xin the second fragment it refers to a pointer to a list object?

Answer 1

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