Python 3 - Name lookup example

local.py

def foo():
    x = 1
 
    def bar():
        x = 2
        print(x)
 
    bar()

foo()

name_resolving.py

a_global = 1

def foo():
    a_local = 2
    a_nonlocal = 3

    def bar():
        a_local = 4
        print(a_local, "is local to bar")
        print(a_nonlocal, "is in the scope of the enclosing function foo")

    bar()
    print(a_global, "is in the global namespace for this module")
    print(int, "is a builtin name")

foo()

nonlocal.py

def foo():
    x = 1
 
    def bar():
        nonlocal x
        x += 1
        print(x)
 
    bar()
 
foo()

parambinding.py

def foo(x=[]):
    x.append(1)
    print(x)

foo()
foo()
foo()

scoped.py

def foo():
    x = 1
 
    def bar():
        print(x + 1)
 
    bar()
 
foo()

unbound.py

def foo():
    x = 1
 
    def bar():
        x += 1
        print(x)
 
    bar()
 
foo()

unbound2.py

def foo():
    x = 1

    def bar():
        print(x)
        if False:
            x = 2

    bar()

foo()