now using f-strings!

lbmpy/advanced_streaming/indexing.py

@@ -20,7 +20,7 @@ class AdvancedStreamingIndexing:
     def proxy_fields(self):
         q = len(self.stencil)
         d = len(self.stencil[0])
-        return ps.fields('f_out({q}), f_in({q}): [{d}}]'.format(q=q, d=d))
+        return ps.fields(f"f_out({q}), f_in({q}): [{d}]")
 
     def dir_symbol(self):
         return TypedSymbol('dir', create_type(np.int64))
@@ -84,13 +84,15 @@ class AdvancedStreamingIndexing:
 
     def _index_array_symbol(self, f_dir, inverse, dir_symbol):
         assert f_dir in ['in', 'out']
-        name = "f_{d}{inv}_dir_idx".format(d=f_dir, inv='_inv' if inverse else '')
+        inv = '_inv' if inverse else ''
+        name = f"f_{f_dir}{inv}_dir_idx"
         self.required_arrays.add(name)
         return sp.IndexedBase(name)[dir_symbol]
 
     def _offset_array_symbols(self, f_dir, inverse, dir_symbol):
         assert f_dir in ['in', 'out']
-        name_base = "f_{d}{inv}_offsets_".format(d=f_dir, inv='_inv' if inverse else '')
+        inv = '_inv' if inverse else ''
+        name_base = f"f_{f_dir}{inv}_offsets_"
         names = [ name_base + d for d in self.directions ]
         self.required_arrays |= set(names)
         return [ sp.IndexedBase(n)[dir_symbol] for n in names ]