On Mon, 2009-08-03 at 19:59 +0000, kj wrote:
>
> I want to write a decorator that, among other things, returns a
> function that has one additional keyword parameter, say foo=None.
>
> When I try
>
> def my_decorator(f):
> # blah, blah
> def wrapper(*p, foo=None, **kw):
> x = f(*p, **kw)
> if (foo):
> # blah, blah
> else
> # blah blah
> return wrapper
>
> ...i get a syntax error where it says "foo=None". I get similar
> errors with everything else I've tried.
>
Not exactly sure what you're trying to do.. but, regular arguments must
be used *before* positional and keyword arguments so the definition:
def wrapper(*p, foo=None, **kw):
is syntactically incorrect whereby the following is correct:
def wrapper(foo=None, *p, **kw):
But if what you are wanting is to actually add 'foo' to kw then I would
do this:
def my_decorator(f):
# blah, blah
def wrapper(*p, **kw):
if 'foo' not in kw:
kw['foo'] = None
x = f(*p, **kw)
if kw['foo']:
# blah blah
else:
# blah blah
return wrapper
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