Fix linting issue with latest ruff

pyproject.toml

@@ -161,10 +161,10 @@ markers = [
 ignore_directives = ["argparse", "automodule"]
 
 [tool.ruff]
-ignore = [
+lint.ignore = [
     "C901",
 ]
-select = [
+lint.select = [
     "C",
     "E",
     "F",

src/subscript/sector2fluxnum/datafile_obj.py

@@ -328,10 +328,8 @@ def set_USEFLUX_header(self, args):
         with open(self.USEFLUX_name, "r", encoding="utf8") as fin:
             lines = fin.readlines()
 
-        idx = 0
-        for line in insert_lines:
-            idx += 1
-            lines.insert(idx, line)
+        for idx, line in enumerate(insert_lines):
+            lines.insert(idx+1, line)
 
         with open(self.USEFLUX_name, "w", encoding="utf8") as fout:
             fout.writelines(lines)

src/subscript/sector2fluxnum/fluxfile_obj.py

@@ -83,10 +83,9 @@ def create_map_rst(
     """
 
     mapping = []
-    counter = 0
     print("Creating map...")
 
-    for index in dest_flux.flux[6][0 : dest_flux.number_flux_cells]:
+    for counter, index in enumerate(dest_flux.flux[6][0 : dest_flux.number_flux_cells]):
         # Find global coordinates in the fine grid
         (i_f, j_f, k_f) = dest_flux.grid.get_ijk(global_index=index - 1)
 
@@ -123,10 +122,8 @@ def create_map_rst(
             # Identify map of coarse grid to collect values to fine grid
             mapping.append(min_pos_index)
 
-        counter += 1
-
-        if counter % 100 == 0:
-            print(f"Map progress: {counter:d}")
+        if (counter+1) % 100 == 0:
+            print(f"Map progress: {counter+1:d}")
 
     return mapping