missed some

pymatgen/core/xcfunc.py

@@ -221,7 +221,7 @@ def type(self):
         # If self is not in defined_aliases, use LibxcFunc family
         if self.xc is not None:
             return self.xc.family
-        return "+".join(self.x.family, self.c.family)
+        return f"{self.x.family}+{self.c.family}"
 
     @lazy_property
     def name(self) -> str:

pymatgen/io/feff/inputs.py

@@ -546,15 +546,15 @@ def __str__(self):
         String representation of Atoms file.
         """
         lines_sorted = self.get_lines()
-        # TODO: remove the formatting and update the unittests
+        # TODO: remove the formatting and update the unit tests
         lines_formatted = str(
             tabulate(
                 lines_sorted,
                 headers=["*       x", "y", "z", "ipot", "Atom", "Distance", "Number"],
             )
         )
         atom_list = lines_formatted.replace("--", "**")
-        return "".join("ATOMS\n", atom_list, "\nEND\n")
+        return f"ATOMS\n{atom_list}\nEND\n"
 
     def write_file(self, filename="ATOMS"):
         """
@@ -564,7 +564,7 @@ def write_file(self, filename="ATOMS"):
            filename: path for file to be written
         """
         with zopen(filename, "wt") as f:
-            f.write(str(self) + "\n")
+            f.write(f"{self}\n")
 
 
 class Tags(dict):