x = 10

y = x

x

y

x = 20

y

y = x

y

x = x + 10

x

y = x
print(y)

x += 1

x

y

x = "blah"
y = x

x += "blah"
# x = x + "blah"

x

y

x = [1, 2, 3]
y = x

x += [4]

x

y

x = (1,2,3)
y= x

x += (4,)

x

y