dynamic_programming/smith_waterman.py

@@ -9,7 +9,7 @@ MISMATCH = -1
 GAP = -2
 
 
-def score_function(source_char: str, target_char: str) -> int:
+def score_function(a: str, b: str) -> int:
     """
     Calculate the score for a character pair based on whether they match or mismatch.
     Returns 1 if the characters match, -1 if they mismatch.
@@ -18,7 +18,7 @@ def score_function(source_char: str, target_char: str) -> int:
     >>> score_function('A', 'C')
     -1
     """
-    if source_char == target_char:
+    if a == b:
         return MATCH
     else:
         return MISMATCH