Automatic attribute assignment

There is a bit of unnecessary repetition in the class definition below.

class Example(object):
    def __init__(self, lots, of, init, args):
        self.lots = lots
        self.of = of
        self.init = init
        self.args = args
        # Do stuff

The autoassign decorator defined in autoassign.py (download here) makes __init__ assign its arguments automatically as attributes of self

class Example(object):
    @autoassign
    def __init__(self, lots, of, init, args):
        # Do stuff

To restrict autoassignment to bar and baz, write:

    @autoassign('bar', 'baz')
    def method(self, foo, bar, baz): ...

To prevent foo and baz from being autoassigned, use:

    @autoassign(exclude=('foo', 'baz'))
    def method(self, foo, bar, baz): ...

The decorator is designed to behave well with default argument values. Here is an example of using these:

>>> class Test(object): 
...      @autoassign('foo', 'bar')
...      def __init__(self, foo, bar=3, baz=6):
...          "some clever stuff going on here"
...          print 'baz =', baz 
... 
>>> class Test2(object):
...     @autoassign
...     def __init__(self, foo, bar): pass
... 
>>> class Test3(object):
...     @autoassign(exclude=('foo', 'bar'))
...     def __init__(self, foo, bar, baz=5, **kwargs): pass
... 
>>> t = Test(1, 2, 5) 
baz = 5
>>> u = Test(foo=8)
baz = 6
>>> v = Test2(10, 11)
>>> w = Test3(100, 101, foobar=102)
>>> 
>>> print Test.__init__.__doc__
some clever stuff going on here
>>> 
>>> print t.foo
1
>>> print t.bar
2
>>> 
>>> print u.foo
8
>>> print u.bar
3
>>> 
>>> print v.foo, v.bar # 10 11
10 11
>>> print w.baz, w.foobar # 5 102
5 102
>>> for obj, attr in ('w', 'foo'), ('w', 'bar'), ('t', 'baz'):
...     try:
...         getattr(globals()[obj], attr)
...     except AttributeError:
...         print '%s.%s raises AttributeError' % (obj, attr)
... 
w.foo raises AttributeError
w.bar raises AttributeError
t.baz raises AttributeError
>>>