Python decorator for automatic binding __init__ arguments?

code.activestate.com/recipes/551763-auto... is what you're looking for. Also see What is the best way to do automatic attribute assignment in Python, and is it a good idea?

That's it! Thank you. – André Lima Feb 20 at 22:07.

It's definitely possible, here's a somewhat naive implementation: def lazy_init(init): import inspect arg_names = inspect. Getargspec(init)0 def new_init(self, *args): for name, value in zip(arg_names1:, args): setattr(self, name, value) init(self, *args) return new_init class Person: @lazy_init def __init__(self, name, age): pass p = Person("Derp", 13) print p. Name, p.

Age Once you start having something besides attributes that map to properties, you're going to run into trouble though. You'll need at least some way to specify which args to initialize as properties... at which point it'll just become more hassle than it's worth.

Thanks. I realize that if the __init__ method is sophisticated it wouldn't be worth it, but the simple ones are so widespread that I think it would be nice to have something like that at hand. – André Lima Feb 19 at 2:26.

Here it goes, in simplest form: def lazy_init(*param_names): def ret(old_init): def __init__(self, *args, **kwargs): if len(args) > len(param_names): raise TypeError("Too many arguments") for k in kwargs: if k not in param_names: raise TypeError("Arg %r unexpected" % k) for par, arg in zip(param_names, args): setattr(self, par, arg) for par, arg in kwargs.items(): setattr(self, par, arg) old_init(*args, **kwargs) return __init__ # return ret class Q(object): @lazy_init("a", "b") def __init__(self, *args, **kwargs): print "Original init" >>> q = Q(1, 2) Original init >>> q. A, q. B (1, 2) Consider making a class decorator to cover __str__ too.

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