class Bar:
    def __init__(self, x):
        self.x = x

barob = Bar(6)

def foobar():
    barob = Bar(3) #local scope, the barob in global namespace is not affected.

foobar()
print(barob.x) #prints 6

def foobar2():
    global barob #barob is the one in global space
    barob = Bar(3)

foobar2()
print(barob.x) #prints 3

barob = Bar(5)
def foobar3():
    barob.x = 7

foobar3()
print(barob.x) #prints 7. Why?