Python key word arguments
- by pythonic metaphor
I have several layers of function calls, passing around a common dictionary of key word arguments:
def func1(**qwargs):
func2(**qwargs)
func3(**qwargs)
I would like to supply some default arguments in some of the subsequent function calls, something like this:
def func1(**qwargs):
func2(arg = qwargs.get("arg", default), **qwargs)
func3(**qwargs)
The problem with this approach is that if arg is inside qwargs, a TypeError is raised with "got multiple values for keyword argument".
I don't want to set qwargs["arg"] to default, because then func3 gets this argument without warrant. I could make a copy.copy of the qwargs and set "arg" in the copy, but qwargs could have large data structures in it and I don't want to copy them (maybe copy.copy wouldn't, only copy.deepcopy?).
What's the pythonic thing to do here?
