diff --git a/dal/student_dal_json.py b/dal/student_dal_json.py
index 83f6273..7de372d 100644
--- a/dal/student_dal_json.py
+++ b/dal/student_dal_json.py
@@ -167,6 +167,7 @@ class StudentDAL:
                 self.save_students(students)
                 return True
         return False
+
     def update_student_partial(self, sid:str, name:Optional[str]=None, height:Optional[float]=None, birth_date:Optional[date]=None, enrollment_date:Optional[date]=None, class_name:Optional[str]=None) ->bool:
         students = self.load_students()
         for i, student in enumerate(students):
diff --git a/model/Student.py b/model/Student.py
index e9afce0..dafa680 100644
--- a/model/Student.py
+++ b/model/Student.py
@@ -22,6 +22,7 @@ class Student:
             self._validation_errors.append("姓名长度需在2-20个字符之间且为可打印字符")
         if not self.name.isprintable():
             self._validation_errors.append("姓名长度需在2-20个字符之间")
+
     def _validate_date(self) -> None:
         today = date.today()
         if self.birth_date > today:
@@ -30,11 +31,14 @@ class Student:
             self._validation_errors.append('入学日期不能在未来')
         if self.birth_date > self.enrollment_date:
             self._validation_errors.append('入学日期不能早于出生日期')
+
     @property
     def is_valid(self) -> bool:
         return len(self._validation_errors) == 0
+
     def get_errors(self) -> list[str]:
         return self._validation_errors.copy()
+
     def __eq__(self, other) -> bool:
         if not isinstance(other, Student):
             return NotImplemented
diff --git a/model/course.py b/model/course.py
deleted file mode 100644
index e69de29..0000000
diff --git a/model/score.py b/model/score.py
deleted file mode 100644
index e69de29..0000000
diff --git a/readme.txt b/readme.txt
deleted file mode 100644
index e69de29..0000000
diff --git a/students_data.json b/students_data.json
deleted file mode 100644
index e69de29..0000000