1 """

     2  This module houses the GEOS exceptions, specifically, GEOSException and

     3  GEOSGeometryIndexError.

     4 """

     5 

     6 class GEOSException(Exception):

     7     "The base GEOS exception, indicates a GEOS-related error."

     8     pass

     9 

    10 class GEOSIndexError(GEOSException, KeyError):

    11     """

    12     This exception is raised when an invalid index is encountered, and has

    13     the 'silent_variable_feature' attribute set to true.  This ensures that

    14     django's templates proceed to use the next lookup type gracefully when

    15     an Exception is raised.  Fixes ticket #4740.

    16     """

    17     # "If, during the method lookup, a method raises an exception, the exception

    18     #  will be propagated, unless the exception has an attribute 

    19     #  `silent_variable_failure` whose value is True." -- Django template docs.

    20     silent_variable_failure = True