Strange logic! :)

[alsimm]

Hi all
python 2.7
can someone explain the logic here I am confused (doesn't take much to confuse me
In the first example everything works OK.But the second example despite the fact that x is a variable
it doesn't work.Now the question here is this...does python have strange logic...or do I
example 1

a = 1
print a
a +=1
print a

example 2

e = 10
print e
x = e +=1
print x

kind regards
al