Update utils/enrollment.py

utils/enrollment.py

@@ -32,12 +32,12 @@ class Enrollment(SQLModel, table=True):
     course: "Course" = Relationship(
         back_populates="enrollments")
 
-    def assign_grade(self, grade: Grade) -> None:
+    def assign_grade(self, grade: str) -> None:
         """
         Assigns a grade to the student for the course.
 
         Args:
-            grade (Grade): The grade to assign to the student.
+            grade (str): The grade to assign to the student.
         """
         self.grade = grade