On Mon, 28 Jan 2008 19:21:48 +1100, Ben Finney wrote:
> In fact, here's a variation that doesn't even need a language
> change::
>
> >>> class Foo(object):
> ... def __init__(self, spam, eggs, beans):
> ... self.__dict__.update(dict(
> ... (name, value) for (name, value) in \
> ... vars().items() if name in ['spam', 'beans']))
> ...
You still need to repeat yourself twice. That's 33% better than repeating
yourself three times, but 100% worse than repeating yourself once.
Other problems:
(1) Readability suffers greatly.
(2) Performance takes a big hit.
>>> class Parrot(object):
... def __init__(self, name, colour, breed):
... self.name = name
... self.colour = colour
... self.breed = breed
...
>>> class Parrot2(object):
... def __init__(self, name, colour, breed):
... self.__dict__.update(dict((name, value) for
... (name, value) in vars().items()
... if name in ['name', 'colour', 'breed']))
...
>>>
>>>
>>> import timeit
>>> timeit.Timer("Parrot(1, 2, 3)",
... "from __main__ import Parrot").repeat()
[3.3467490673065186, 2.2820541858673096, 2.2934978008270264]
>>> timeit.Timer("Parrot2(1, 2, 3)",
... "from __main__ import Parrot2").repeat()
[13.148159027099609, 13.015455961227417, 11.936856985092163]
--
Steven
--
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