Call me weird, but sometimes I need functions taking a number of
positional arguments, some named arguments with default values, and
other named arguments as well.
Something like this (which does _not_ work):
def function(*args, defarg1=None, defarg2=0, **kw):
...
The usual way to program this is:
def function(*args, ***kw):
if kw.has_key('defarg1'):
defarg1 = kw['defarg1']
del kw['defarg1']
else:
defarg1 = None
if kw.has_key('defarg2'):
defarg1 = kw['defarg2']
del kw['defarg2']
else:
defarg2 = 0
# ...process the positional arguments in args
# ...process the remaining named arguments in kw
Doesn't look very pretty IMO, and using the dictionaries'
get method doesn't help.
I was thinking of a popitem() dictionary method taking
(optionally) 2 arguments: the name of the item to pop,
and the default value to return if the item is not present
in the dictionary:
>>> d = {'a': 2, 'b': 3}
>>> d.popitem('defarg', 0)
0
>>> d
{'a': 2, 'b': 3}
>>> d.popitem('a', 100)
2
>>> d
{'b': 3}
>>>
Opinions?
Thomas
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