Python: Iterating through constructor's arguments

Question

I often find myself writing class constructors like this:

class foo:
    def __init__(self, arg1, arg2, arg3):
        self.arg1 = arg1
        self.arg2 = arg2
         


        

Answer 1

You can do that both for positional and for keyword arguments:

class Foo(object):
    def __init__(self, *args, **kwargs):
        for arg in args:
            print arg
        for kwarg in kwargs:
            print kwarg

* packs positional arguments into a tuple and ** keyword arguments into a dictionary:

foo = Foo(1, 2, 3, a=4, b=5, c=6) // args = (1, 2, 3), kwargs = {'a' : 4, ...}