Fixed linting errors

Author: RevanthGundala

cirq-core/cirq/ops/controlled_gate.py

@@ -175,18 +175,13 @@ def _decompose_with_context_(
                 protocols.unitary(self.sub_gate), control_qubits, qubits[-1]
             )
             return invert_ops + decomposed_ops + invert_ops
-        if isinstance(self.sub_gate, gp.GlobalPhaseGate):
-            # A controlled global phase is a diagonal gate, where each active control value index
-            # is set equal to the phase angle.
-            shape = self.control_qid_shape
-            if protocols.is_parameterized(self.sub_gate) or set(shape) != {2}:
-                # Could work in theory, but DiagonalGate decompose does not support them.
-                return NotImplemented
-            angle = np.angle(complex(self.sub_gate.coefficient))
-            rads = np.zeros(shape=shape)
-            for hot in self.control_values.expand():
-                rads[hot] = angle
-            return dg.DiagonalGate(diag_angles_radians=[*rads.flatten()]).on(*qubits)
+        unitary = protocols.unitary(self.sub_gate, default=None)
+        if(
+            unitary is not None
+            and unitary.shape == (1, 1)
+            and np.isclose(np.abs(unitary[0, 0]), 1)
+        ):
+            return unitary[0][0].angle 
         if isinstance(self.sub_gate, common_gates.CZPowGate):
             z_sub_gate = common_gates.ZPowGate(exponent=self.sub_gate.exponent)
             num_controls = self.num_controls() + 1

cirq-core/cirq/ops/pauli_string_test.py

@@ -2152,4 +2152,4 @@ def test_pauli_ops_identity_gate_operation():
             ), f"Addition failed for {p1} + {p2}"
             assert isinstance(
                 p1 - p2, (cirq.PauliSum, cirq.PauliString)
-            ), f"Subtraction failed for {p1} - {p2}"
+            ), f"Subtraction failed for {p1} - {p2}"