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

As others have noted, you should probably stick to your original 'pythonic' method in most cases.

However, if you really want to go the whole nine yards, here's some code that neatly deals with args, keyword args if desired, and avoids boilerplate repetition:

def convert_all_args_to_attribs(self, class_locals):
    class_locals.pop('self')
    if 'kwargs' in class_locals:
        vars(self).update(class_locals.pop('kwargs'))
    vars(self).update(class_locals)

class FooCls:
    def __init__(self, foo, bar):
        convert_all_args_to_attribs(self, locals())

class FooClsWithKeywords:
    def __init__(self, foo, bar, **kwargs):
        convert_all_args_to_attribs(self, locals())

f1 = FooCls(1,2)
f2 = FooClsWithKeywords(3,4, cheese='stilton')


print vars(f1) #{'foo': 1, 'bar': 2}
print vars(f2) #{'cheese': 'stilton', 'foo': 3, 'bar': 4}