Merge pull request #2029 from dopplershift/cleanup

Misc cleanups

src/metpy/calc/thermo.py

@@ -3323,7 +3323,7 @@ def k_index(pressure, temperature, dewpoint):
 )
 @check_units('[length]', '[temperature]', '[speed]', '[speed]')
 def gradient_richardson_number(height, potential_temperature, u, v, vertical_dim=0):
-    r"""Calculate the gradient (or flux) Richardson number.
+    r"""Calculate the gradient Richardson number.
 
     .. math:: Ri = \frac{g}{\theta} \frac{\left(\partial \theta/\partial z\right)}
              {\left(\partial u / \partial z\right)^2 + \left(\partial v / \partial z\right)^2}

src/metpy/io/_tools.py

@@ -138,7 +138,7 @@ class Enum:
     def __init__(self, *args, **kwargs):
         """Initialize the mapping."""
         # Assign values for args in order starting at 0
-        self.val_map = {ind: a for ind, a in enumerate(args)}
+        self.val_map = dict(enumerate(args))
 
         # Invert the kwargs dict so that we can map from value to name
         self.val_map.update(zip(kwargs.values(), kwargs.keys()))