callback confusion

[Donn Ingle]

Hi,
I have two modules, the second is imported by the first.
Let's call them one.py and two.py (two being my API)

In the first I register a function into the second.
[in one.py]
def boo(): ...
....
two.register( boo )

two.startLoop()

In two.py it starts a loop (GTK timeout), so processing remains there.
At some point it's time to call the callback.

[within the loop in two.py]
f = getFunc()
f()

That works, it calls boo( ) in one.py -- all fine. The thing I can't figure
out is that it's calling it from the namespace p.o.v of two.py -- For
example:

[in one.py]
kills=0
def boo():
print kills

It will abort with:
print kills
UnboundLocalError: local variable 'kills' referenced before assignment

How can I get the 'self' of a module? If I could tell it to [print
moduleself.kills] or something like that I'd be in business again.
It would be best to have no funny stuff on the user-end of the API; a
simple [print kills] would be best.

\d

 

[Bruno Desthuilliers]

Donn Ingle a écrit :
(snip)

[in one.py]
kills=0
def boo():
print kills

It will abort with:
print kills
UnboundLocalError: local variable 'kills' referenced before assignment

As far as I can tell, you have a bit more code in boo, and somewhere in
that code (after the print statement), you rebind the name 'kills'. In
the absence of a global declaration, this makes this name a local
variable. FWIW, this is a FAQ.

 

[Donn Ingle]

As far as I can tell, you have a bit more code in boo, and somewhere in

that code (after the print statement), you rebind the name 'kills'.

Okay, yes:
def boo()
kills += 1
print kills

the absence of a global declaration, this makes this name a local
variable.

I think I see what you mean:
.... kills += 1
.... print kills
....Traceback (most recent call last):
File "<stdin>", line 1, in <module>
77

I'm amazed that I've spent so much time with Python and something like that
totally stumps me!?

FWIW, this is a FAQ.

If you have a link, that'll help.

\d

 

[Gabriel Genellina]

UnboundLocalError: local variable 'kills' referenced before assignment

I'm amazed that I've spent so much time with Python and something like
that
totally stumps me!?

If you have a link, that'll help.

See
<http://www.python.org/doc/faq/programming/#how-do-you-set-a-global-variable-in-a-function>
and the next question.