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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 has_mixture(val: Any) -> bool: """Returns whether the value has a mixture representation. Returns: If `val` has a `_has_mixture_` method and its result is not NotImplemented, that result is returned. Otherwise, if the value has a `_mixture_` method return True if that has a non-default value. Returns False if neither function exists. """

    getter = getattr(val, '_has_mixture_', None)
    result = NotImplemented if getter is None else getter()
    if result is not NotImplemented:
        return result

    # No _has_mixture_ function, use _mixture_ instead
    return mixture(val, None) is not None