"Kevin Dangoor" <[EMAIL PROTECTED]> writes:
> Should unexpected parameters raise an exception every time?
Hmmm... I'd try applying the saying "be liberal with what you get and strict
with what you send". What I think is the best approach is:
- if using something like **kw accept everything (even with validators
missing for unexpected parameters)
- if using keywords accept just what is declared in keywords and raise an
exception on unexpected parameters, as Python does.
>>> def testing(a = None, b = None):
... print a
... print b
...
>>> testing()
None
None
>>> testing(a = 123)
123
None
>>> testing(b = 123)
None
123
>>> testing(a = 123, b = 234)
123
234
>>> testing(c = 123)
Traceback (most recent call last):
File "<stdin>", line 1, in ?
TypeError: testing() got an unexpected keyword argument 'c'
>>>
Why? Because one might pass things outside of the declared form for some
other purpose. If it is not declared in the validator, it is the developer's
responsability to validate it by hand (using formencode or not) and when you
declare just some keywords on your method's signature you are explicitly
stating that you don't want anything else.
--
Jorge Godoy <[EMAIL PROTECTED]>
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