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    :param exception: This can be one of the following:

                      * `None`, indicating that an exception must be
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                      * An exception class, indicating that the type
                        of the exception is important but not the
                        parameters it is created with.

                      * An exception instance, indicating that an
                        exception exactly matching the one supplied
                        should be raised.

    :param unless: Can be passed a boolean that, when ``True`` indicates that
                   no exception is expected. This is useful when checking
                   that exceptions are only raised on certain versions of
                   Python.
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