Add formatting GraphMonomorphismMapper initial placement strategy

Author: sefunmi4

cirq-core/cirq/transformers/routing/graph_monomorphism_mapper.py

@@ -27,7 +27,7 @@
 
 from __future__ import annotations
 
-from typing import TYPE_CHECKING, Dict, Iterable, Optional, Tuple
+from typing import Dict, Iterable, Optional, Tuple, TYPE_CHECKING
 
 import networkx as nx
 
@@ -187,4 +187,4 @@ def __repr__(self):
             "cirq.GraphMonomorphismMapper("
             f"nx.{graph_type}({dict(self.device_graph.adjacency())}), "
             f"max_matches={self.max_matches}, timeout_steps={self.timeout_steps})"
-        )
+        )

cirq-core/cirq/transformers/routing/graph_monomorphism_mapper_test.py

@@ -20,8 +20,8 @@
 import cirq
 
 # Unit tests: keep N small and VF2 bounded.
-_MAX_MATCHES = 1          # stop at first embedding
-_TIMEOUT_STEPS = 2_000    # hard cap search work
+_MAX_MATCHES = 1  # stop at first embedding
+_TIMEOUT_STEPS = 2_000  # hard cap search work
 
 
 def construct_star_circuit_5q():
@@ -132,4 +132,4 @@ def test_more_logical_than_physical_fails_fast() -> None:
 def test_repr() -> None:
     g = cirq.testing.construct_grid_device(4, 4).metadata.nx_graph
     mapper = cirq.GraphMonomorphismMapper(g, max_matches=123, timeout_steps=456)
-    cirq.testing.assert_equivalent_repr(mapper, setup_code="import cirq\nimport networkx as nx")
+    cirq.testing.assert_equivalent_repr(mapper, setup_code="import cirq\nimport networkx as nx")