bug in python's scope handling?

[Philipp Weinfurter]

hi everyone!

a = 1

def func1():
    b = a + 1

right, the local variable b is assigned the value of the global variable
a. so far, so good.

def func2():
    a = a + 1

and now the local variable a is assigned... uh, nothing because it produces
an UnboundLocalError.

now, i admit that no programmer should ever write such code, but i still
consider this a bug. what _should_ happen, is this: the right side of
the assignment is evaluated first, thus adding 1 to the value of the global 
variable a, then the result should be assigned to the local variable a,
no?
then