On 15/07/13 09:13 AM, Joshua Landau wrote:
On 15 July 2013 16:50, Jack Bates <tdh...@nottheoilrig.com> wrote:
Hello,
Is the following code supposed to be an UnboundLocalError?
Currently it assigns the value 'bar' to the attribute baz.foo
foo = 'bar'
class baz:
foo = foo
If so, then no. Assignments inside class bodies are special-cased in
Python. This is because all assignments refer to properties of "self"
on the LHS but external things too on the RHS. This is why you can do
"def x(): ..." instead of "def self.x(): ..." or some other weird
thing. There's also some extra special stuff that goes on.
In order to make this an UnboundLocalError, lots of dramatic and
unhelpful changes would have to take place, hence the current
behaviour. The current behaviour is useful, too.
Ah, thank you Chris Angelico for explaining how this is like what
happens with default arguments to a function and Joshua Landau for
pointing out how assignments inside class bodies refer to properties of
"self" on the LHS. It makes sense now. Only I'm struggling to find where
the behavior is defined in the language reference. Can someone please
help point me to where in the language reference this is discussed? I've
been hunting through the section on naming and binding:
http://docs.python.org/3/reference/executionmodel.html#naming-and-binding
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