Suggested style fixes for data fixtures

data_for_test.py

 import pytest
 import utilities as u
 
+
 # {{{ FluxDataSingle
 
 class FluxDataSingle:
@@ -54,24 +55,25 @@ class FluxDataSingle:
 
     def swap_array(self, arr, d):
         p = self.permutation(d)
-        arr[p] = arr[[1,2,3]]
+        arr[p] = arr[[1, 2, 3]]
         return arr
 
     def swap_array_rows(self, arr, d):
         p = self.permutation(d)
-        arr[p,:] = arr[[1,2,3],:]
+        arr[p, :] = arr[[1, 2, 3], :]
         return arr
 
     def swap_array_cols(self, arr, d):
         p = self.permutation(d)
-        arr[:,p] = arr[:,[1,2,3]]
+        arr[:, p] = arr[:, [1, 2, 3]]
         return arr
 
     def permutation(self, d):
-        return [(d-1+i)%3 + 1 for i in range(3)]
+        return [(d-1+i) % 3 + 1 for i in range(3)]
 
 # }}}
 
+
 single_data = {}
 
 # {{{ Input data: Case (a)
@@ -703,7 +705,7 @@ single_data["Case d:z"] = FluxDataSingle(
     "Case b:x", "Case b:y", "Case b:z",
     "Case c:x", "Case c:y", "Case c:z",
     "Case d:x", "Case d:y", "Case d:z"])
-def data(request):
+def flux_test_data_fixture(request):
     return single_data[request.param]