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�DNSExceptiona�Abstract base class shared by all dnspython exceptions.

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    as before and all *args are printed by standard __str__ implementation.
    Class variable msg (or doc string if msg is None) is returned from str()
    if *args is empty.

    b) New/parametrized mode is used if __init__ was called with
    non-empty **kwargs.
    In the new mode *args has to be empty and all kwargs has to exactly match
    set in class variable self.supp_kwargs. All kwargs are stored inside
    self.kwargs and used in new __str__ implementation to construct
    formatted message based on self.fmt string.

    In the simplest case it is enough to override supp_kwargs and fmt
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