Hi all,
I've just recently come across a need for this idiom (isn't
this new in Python 2.x?):
def my_func(spam, ham=1, **eggs):
#...
pass
where 'eggs' gets a dictionary of keyword arguments. I
haven't previously had any experience with it.
It seems that Zope's ZSQL methods accept their arguments
in this form, but I need to provide an intermediate layer.
Is there any way of writing a general call that passes a
received set of keywords on to a called function. The
following is apparently illegal, but I hope it expresses the
concept:
def sql_funct_i_want_to_call(**kw):
"""
makes an SQL query using keyword args and returns
a result object, kw always contains a "username=''"
field in this case.
"""
# ...
pass
def my_wrapper(username='anonymous', **kw):
"""
Now I want to try the call and return the result
if there is one. Otherwise, I want to return a default
record.
"""
kw['username']=username
result = sql_funct_i_want_to_call(kw)
if result:
return result
else:
kw['username']='anonymous'
result = sql_funct_i_want_to_call(kw)
if not result:
raise BrokenDBError("Database has no anonymous/default user")
else:
return result
Or something along those lines. The only problem is that python
doesn't seem to understand what I want when I try to pass the
dictionary to the object
"TypeError: sql_funct_i_want_to_call() takes exactly 0 arguments (1 given)"
Is there a way to get what I want to do here without having
to go through too many hoops? If I knew in advance what
the arguments would be, I could do it that way, but I'd like to
be able to define a general behavior and use it for a lot of
similar SQL calls, in which case, kw would vary depending on
the call needed.
Maybe this is really obvious to someone else, but I can't see how
to do it.
Thanks for any ideas,
Terry
--
Terry Hancock ( hancock at anansispaceworks.com )
Anansi Spaceworks http://www.anansispaceworks.com