Remove unused imports

Author: thisac

dwave/graphs/topologies/zephyr/coords.py

@@ -19,7 +19,7 @@
 __all__ = ["zephyr_coordinates"]
 
 
-from collections.abc import Callable, Generator, Iterable, Iterator, Sequence
+from collections.abc import Callable, Generator, Iterable, Sequence
 
 import networkx as nx
 

dwave/graphs/topologies/zephyr/graphs.py

@@ -12,7 +12,7 @@
 #    limitations under the License.
 
 """Generators for some graphs derived from the D-Wave System."""
-from collections.abc import Callable, Generator, Iterable, Iterator
+from collections.abc import Callable, Generator, Iterable
 from itertools import product
 
 import networkx as nx