Fix pre-commit: Format as f-strings

New requirement by ruff 0.8.x

Author: EwoutH

mesa/examples/basic/boltzmann_wealth_model/st_app.py

@@ -68,7 +68,7 @@
     for i in range(num_ticks):
         model.step()
         my_bar.progress((i / num_ticks), text="Simulation progress")
-        placeholder.text("Step = %d" % i)
+        placeholder.text(f"Step = {i}")
         for cell in model.grid.coord_iter():
             cell_content, (x, y) = cell
             agent_count = len(cell_content)

mesa/examples/basic/conways_game_of_life/st_app.py

@@ -49,9 +49,9 @@
     for i in range(num_ticks):
         model.step()
         my_bar.progress((i / num_ticks), text="Simulation progress")
-        placeholder.text("Step = %d" % i)
+        placeholder.text(f"Step = {i}")
         for contents, (x, y) in model.grid.coord_iter():
-            # print('x:',x,'y:',y, 'state:',contents)
+            # print(f"x: {x}, y: {y}, state: {contents}")
             selected_row = df_grid[(df_grid["x"] == x) & (df_grid["y"] == y)]
             df_grid.loc[selected_row.index, "state"] = (
                 contents.state