gh-128: add example of how to use new baryon boost

fix_nb.py

@@ -0,0 +1,33 @@
+import json
+
+nb = json.load(open("tutorials/cosmology/baryon_boost.ipynb"))
+
+for cell in nb["cells"]:
+    src = "".join(cell["source"])
+    if cell["cell_type"] == "markdown" and "BACCOemuFLAMINGOPerturbations" in src:
+        # Fix background= in FlamingoBaryonBoostMixin.__init__
+        old = (
+            "        FlamingoBaryonBoostMixin.__init__(\n"
+            "            self,\n"
+            "            background=background,\n"
+            "            fgas_sigma=fgas_sigma,"
+        )
+        new = (
+            "        FlamingoBaryonBoostMixin.__init__(\n"
+            "            self,\n"
+            "            fgas_sigma=fgas_sigma,"
+        )
+        src = src.replace(old, new)
+        # Fix [0] on matter_power_spectrum result
+        src = src.replace(
+            "Pk_bacco_with_flamingo_A = pert_bacco_flamingo_A.matter_power_spectrum(z_ref, k_eval)[0]",
+            "Pk_bacco_with_flamingo_A = pert_bacco_flamingo_A.matter_power_spectrum(z_ref, k_eval)",
+        )
+        cell["source"] = [src]
+        print("Fixed markdown cell:", cell.get("id"))
+        break
+else:
+    print("Target cell not found!")
+
+json.dump(nb, open("tutorials/cosmology/baryon_boost.ipynb", "w"), indent=1)
+print("Saved.")