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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def compatcallback(f):
 """ Compatibility callback decorator for older click version. Click 1.0 does not have a version string stored, so we need to use getattr here to be safe. """

    if getattr(click, '__version__', '0.0') >= '2.0':
        return f
    return update_wrapper(lambda ctx, value: f(ctx, None, value), f)