On 2011-06-15 02:28, Jan Kaliszewski wrote:
Jan Kaliszewski dixit (2011-06-14, 12:17):
But in case of:
def sth(*args, **kwargs, my_var='foo'): "do something"
-- should 'my_var' in kwargs be allowed? (it's a runtime question) There is no real conflict here, so at the first sight I'd say: yes.
On second thought: no, such repetitions also should *not* be allowed. If a programmer, by mistake, would try to specify the argument value in a call, an explicit TypeError should be raised -- otherwise it'd become a trap (especially for beginners and absent-minded programmers).
I disagree. One of the main selling points of this feature for me is that adding a few "hidden parameters" to a function does not change the signature of the function. If you raise a TypeError when the name of a hidden parameter is in kwargs this is a change in signature. - Jacob