Apply suggestions from code review

Co-authored-by: Zachary Prince <zachmprince@gmail.com>
Co-authored-by: John Stilley <1831479+john-science@users.noreply.github.com>

armi/reactor/tests/test_blocks.py

@@ -2052,9 +2052,7 @@ def test_getPinCoords(self):
         nPins = self.HexBlock.getNumPins()
         side = hexagon.side(blockPitch)
         xyz = self.HexBlock.getPinCoordinates()
-        x = xyz[:, 0]
-        y = xyz[:, 1]
-        z = xyz[:, 2]
+        x, y, z = xyz.T
         self.assertAlmostEqual(
             y[1], y[2]
         )  # first two pins should be side by side on top.

armi/reactor/tests/test_hexBlockRotate.py

@@ -22,8 +22,8 @@
 from armi.reactor.blocks import HexBlock
 from armi.reactor.components import Component
 from armi.reactor.grids import MultiIndexLocation, CoordinateLocation
-from armi.utils import iterables
 from armi.reactor.tests.test_blocks import loadTestBlock, NUM_PINS_IN_TEST_BLOCK
+from armi.utils import iterables
 
 
 class HexBlockRotateTests(unittest.TestCase):
@@ -121,7 +121,6 @@ def test_pinRotationLocations(self):
         .. test:: HexBlock.getPinLocations is consistent with rotation.
             :id: T_ARMI_ROTATE_HEX_PIN_LOCS
             :tests: R_ARMI_ROTATE_HEX
-
         """
         preRotation = self.BASE_BLOCK.getPinLocations()
         for nRotations in range(-10, 10):
@@ -229,7 +228,6 @@ class EmptyBlockRotateTest(unittest.TestCase):
     """Rotation tests on an empty hexagonal block.
 
     Useful for enforcing rotation works on blocks without pins.
-
     """
 
     def setUp(self):