Merge pull request #1186 from white-gecko/avoid_using_assert_in_sparq…

…lconnector

Remove the usage of assert in the SPARQLConnector

rdflib/plugins/stores/sparqlconnector.py

@@ -52,8 +52,10 @@ def __init__(
         self.kwargs = kwargs
         self.method = method
         if auth is not None:
-            assert type(auth) == tuple, "auth must be a tuple"
-            assert len(auth) == 2, "auth must be a tuple (user, password)"
+            if type(auth) != tuple:
+                raise SPARQLConnectorException("auth must be a tuple")
+            if len(auth) != 2:
+                raise SPARQLConnectorException("auth must be a tuple (user, password)")
             base64string = base64.b64encode(bytes('%s:%s' % auth, 'ascii'))
             self.kwargs.setdefault("headers", {})
             self.kwargs["headers"].update({"Authorization": "Basic %s" % base64string.decode('utf-8')})