automate sudoku boards

assignment2/csp.py

@@ -98,6 +98,7 @@ class CSP:
         """
 
         def backtrack(csp, assignment: dict[str, Any]) -> dict | None:
+            print("i have been called")
             if len(assignment) == len(csp.variables):
                 return assignment  # base-case
             var = select_unassigned_variable(csp, assignment)
@@ -108,6 +109,7 @@ class CSP:
                 if result := backtrack(csp, assignment):
                     return result
                 assignment.pop(var)
+            print("i have failed")
             return None  # failure
 
         def consistent(csp, var, value, assignment) -> bool: