diff --git a/nkcs/ea.py b/nkcs/ea.py
index 71babcd..85e091e 100644
--- a/nkcs/ea.py
+++ b/nkcs/ea.py
@@ -52,12 +52,9 @@ def to_string(self) -> str:
 
     def mutate(self) -> None:
         """Mutate an individual."""
-        for i in range(len(self.genome)):
+        for i, gene in enumerate(self.genome):
             if np.random.uniform(low=0, high=1) < Cons.P_MUT:
-                if self.genome[i] == 0:
-                    self.genome[i] = 1
-                else:
-                    self.genome[i] = 0
+                self.genome[i] = 1 if gene == 0 else 1
 
     def uniform_crossover(self, parent: Ind) -> None:
         """Perform uniform crossover."""
@@ -192,9 +189,9 @@ def print_archive(self, s: int) -> None:
     def print_pop(self) -> None:
         """Print the current populations."""
         for s in range(Cons.S):
-            logger.info(f"Species {s}")
+            logger.info("Species %d", s)
             for p in self.pop[s]:
-                logger.info(p.to_string())
+                logger.info("%s", p.to_string())
 
     def run_ea(
         self, nkcs: NKCS, evals: np.ndarray, pbest: np.ndarray, pavg: np.ndarray
diff --git a/nkcs/main.py b/nkcs/main.py
index e0ff97e..53c47a6 100644
--- a/nkcs/main.py
+++ b/nkcs/main.py
@@ -16,7 +16,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 
-"""Main script for starting NKCS (co)evolutionary experiments."""
+"""Main script for starting NKCS coevolutionary experiments."""
 
 from __future__ import annotations
 
@@ -34,8 +34,6 @@
 from .plot import plot
 
 if __name__ == "__main__":
-    """Run experiment.."""
-
     # results storage
     n_res: Final[int] = Cons.F * Cons.E
     evals: np.ndarray = np.zeros((n_res, Cons.G))
diff --git a/nkcs/nkcs.py b/nkcs/nkcs.py
index 3a9e29f..c3be09f 100644
--- a/nkcs/nkcs.py
+++ b/nkcs/nkcs.py
@@ -167,6 +167,6 @@ def display(self) -> None:
             """Print an NKCS species."""
             logger.info(f"con: {self.map}")
             logger.info("fitness table:")
-            for i in range(len(self.ftable)):
+            for i, fitness in enumerate(self.ftable):
                 logger.info(f"Gene {i}")
-                logger.info(self.ftable[i])
+                logger.info(fitness)