python variables and scope

#Ref: stackoverflow.com/questions/1261875/python-nonlocal-statement
from __future__ import print_function      #Compatibilidade func print python 2/3

global x #OPC -> main
x = 0

def fext():
    x = 1
    def fin_nl():
        #Var nao local da funcao interna, pega da func externa (fext)
        nonlocal x
        x = 2
        print("fin_nl: ", x)

    def fin_l():
        #Variavel local
        x = 3
        print("fin_l:  ", x)

    fin_nl()
    fin_l()
    print("fext:   ", x)
#

def f_varg():
    #Variavel global
    global x
    x = 4
    print("f_varg: ", x)
#

#MAIN
fext()
print("main:   ", x)
f_varg()
print("main:   ", x)


"""
ANTES DE EXECUTAR O CÓDIGO,
Preencher abaixo os valores que serão impressos
fin_nl: x
fin_l:  x
fext:   x
main:   x
f_varg: x
main:   x
"""