Strange logic! :)

[idontreallywolf]

because x = e += 1 is same as
x = e = e + 1

actually, the first one is invalid syntax and rise SynatxError,
while second one is perfectly fine

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

Output:
11
11

Then why would x = e += 1 be invalid if its the same as x = e = e + 1 ?