Source

wheel / wheel / decorator.py

# from Pyramid


class reify(object):

    """ Put the result of a method which uses this (non-data)
    descriptor decorator in the instance dict after the first call,
    effectively replacing the decorator with an instance variable."""

    def __init__(self, wrapped):
        self.wrapped = wrapped
        try:
            self.__doc__ = wrapped.__doc__
        except:  # pragma: no cover
            pass

    def __get__(self, inst, objtype=None):
        if inst is None:
            return self
        val = self.wrapped(inst)
        setattr(inst, self.wrapped.__name__, val)
        return val
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