+
−"""
+
− This module houses the GEOS exceptions, specifically, GEOSException and
+
− GEOSGeometryIndexError.
+
−"""
+
−
+
−class GEOSException(Exception):
+
−    "The base GEOS exception, indicates a GEOS-related error."
+
−    pass
+
−
+
−class GEOSIndexError(GEOSException, KeyError):
+
−    """
+
−    This exception is raised when an invalid index is encountered, and has
+
−    the 'silent_variable_feature' attribute set to true.  This ensures that
+
−    django's templates proceed to use the next lookup type gracefully when
+
−    an Exception is raised.  Fixes ticket #4740.
+
−    """
+
−    # "If, during the method lookup, a method raises an exception, the exception
+
−    #  will be propagated, unless the exception has an attribute 
+
−    #  `silent_variable_failure` whose value is True." -- Django template docs.
+
−    silent_variable_failure = True