Fix format, mypy and pylint errors.

Author: codrut3

qualtran/rotation_synthesis/matrix/_clifford_t_repr.py

@@ -81,7 +81,7 @@ def _xz_sequence(
 
 
 def _matsumoto_amano_sequence(matrix: _su2_ct.SU2CliffordT) -> tuple[str, ...]:
-    """Represents the Clifford+T operator in the Matsumoto-Amano normal form.
+    r"""Represents the Clifford+T operator in the Matsumoto-Amano normal form.
 
     Returns:
         a list of gates matching the regular expression $(T|\eps)(HT|SHT)^*C$,
@@ -103,6 +103,7 @@ def _matsumoto_amano_sequence(matrix: _su2_ct.SU2CliffordT) -> tuple[str, ...]:
         if np.all(parity[:, i] == 0):
             parity[:, [i, 2]] = parity[:, [2, i]]
             break
+    gates : tuple[str, ...] = ()
     if np.array_equal(parity, np.array([[1, 1, 0], [1, 1, 0], [0, 0, 0]])):
         # Leftmost syllabe is T
         new = _su2_ct.TSqrt2.adjoint() @ matrix

qualtran/rotation_synthesis/matrix/clifford_t_repr_test.py

@@ -73,7 +73,7 @@ def test_to_cirq(g: _su2_ct.SU2CliffordT, fmt: str):
 @pytest.mark.parametrize(
     ["g", "fmt", "expected"],
     [
-        [_su2_ct.HSqrt2, "t", ('"Z^½"', '"X"', '"Z^½"', '"X"', '"H"',)],
+        [_su2_ct.HSqrt2, "t", ('"Z^½"', '"X"', '"Z^½"', '"X"', '"H"')],
         [_su2_ct.SSqrt2, "t", ('{"id":"Rzft","arg":"pi/2"}',)],
         [_su2_ct.TSqrt2, "t", ('{"id":"Rzft","arg":"pi/4"}',)],
     ],

qualtran/rotation_synthesis/rings/_zw.py

@@ -207,12 +207,12 @@ def to_zsqrt2(self) -> tuple[_zsqrt2.ZSqrt2, _zsqrt2.ZSqrt2, bool]:
         )
 
     def real_zsqrt2(self) -> _zsqrt2.ZSqrt2:
-        """Returns \sqrt{2} * the real part of the element."""
+        r"""Returns \sqrt{2} * the real part of the element."""
         a, _, need_w = self.to_zsqrt2()
         return a * _zsqrt2.SQRT_2 + _zsqrt2.ZSqrt2(need_w, 0)
 
     def imag_zsqrt2(self) -> _zsqrt2.ZSqrt2:
-        """Returns \sqrt{2} * the imaginary part of the element."""
+        r"""Returns \sqrt{2} * the imaginary part of the element."""
         _, b, need_w = self.to_zsqrt2()
         return b * _zsqrt2.SQRT_2 + _zsqrt2.ZSqrt2(need_w, 0)