To expand on `gruszczy`s answer, I have used a pattern like:

    class X:
        x = None
        y = None
        z = None
        def __init__(self, **kwargs):
            for (k, v) in kwargs.items():
                if hasattr(self, k):
                    setattr(self, k, v)
                else:
                    raise TypeError('Unknown keyword argument: {:s}'.format(k))

I like this method because it:

 * avoids repetition
 * is resistant against typos when constructing an object
 * works well with subclassing (can just `super().__init(...)`)
 * allows for documentation of the attributes on a class-level (where they belong) rather than in `X.__init__`

Prior to Python 3.6, this gives no control over the order in which the attributes are set, which could be a problem if some attributes are properties with setters that access other attributes.

It could probably be improved upon a bit, but I'm the only user of my own code so I am not worried about any form of input sanitation.  Perhaps an `AttributeError` would be more appropriate.