Fix some linter warnings on isinstance calls

Author: ZedThree

src/boutdata/collect.py

@@ -83,7 +83,7 @@ def _convert_to_nice_slice(r, N, name="range"):
         temp_slice = slice(N)
     elif isinstance(r, slice):
         temp_slice = r
-    elif isinstance(r, (int, np.integer)):
+    elif isinstance(r, int | np.integer):
         if r >= N or r < -N:
             # raise out of bounds error as if we'd tried to index the array with r
             # without this, would return an empty array instead

src/boututils/datafile.py

@@ -182,7 +182,7 @@ def read(self, name, ranges=None, asBoutArray=True):
         """
         if ranges is not None:
             for x in ranges:
-                if isinstance(x, (list, tuple)):
+                if isinstance(x, list | tuple):
                     x = slice(*x)
         return self.impl.read(name, ranges=ranges, asBoutArray=asBoutArray)
 

src/boututils/showdata.py

@@ -423,9 +423,9 @@ def showdata(
     # Generate grids for plotting
     # Try to use provided grids where possible
     # If x and/or y are not lists, apply to all variables
-    if not isinstance(x, (list, tuple)):
+    if not isinstance(x, list | tuple):
         x = [x] * Nvar  # Make list of x with length Nvar
-    if not isinstance(y, (list, tuple)):
+    if not isinstance(y, list | tuple):
         y = [y] * Nvar  # Make list of x with length Nvar
     xnew = []
     ynew = []