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To expand on gruszczys 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__

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.