Nonlocal Variables

The nonlocal statement causes the listed identifiers to refer to previously bound variables in the nearest enclosing scope excluding globals

global_value = 1

def function():
    function_value = 2

    def nested_function():
        global global_value
        nonlocal function_value

        global_value = 3
        function_value = 4

    nested_function()
    print("Global value:", global_value)
    print("Function value:", function_value)

function()


Output:

Global value: 3
Function value: 4