Fixed linting erorrs

Author: RevanthGundala

cirq-core/cirq/ops/pauli_string_test.py

@@ -2138,6 +2138,7 @@ def test_resolve(resolve_fn):
     ps1 = cirq.PauliString({q: 'x'}, coefficient=1j)
     assert resolve_fn(pst, {'t': 1j}) == ps1
 
+
 def test_pauli_ops_identity_gate_operation():
     q = cirq.LineQubit(0)
     paulis = (cirq.I(q), cirq.X(q), cirq.Y(q), cirq.Z(q))
@@ -2146,4 +2147,4 @@ def test_pauli_ops_identity_gate_operation():
             # TODO: Support addition and subtraction of identity gate operations
             if p1 == cirq.I(q) and p2 == cirq.I(q): continue
             assert isinstance(p1 + p2, (cirq.PauliSum, cirq.PauliString)), f"Addition failed for {p1} + {p2}"
-            assert isinstance(p1 - p2, (cirq.PauliSum, cirq.PauliString)), f"Subtraction failed for {p1} - {p2}"
+            assert isinstance(p1 - p2, (cirq.PauliSum, cirq.PauliString)), f"Subtraction failed for {p1} - {p2}"