尝试合并，所有代码需要调整from后文件路径。

class_management/model/class_management_model.py

@@ -1,10 +1,10 @@
 from sqlalchemy import Column, Integer, String, Date, ForeignKey
 from sqlalchemy.dialects.mysql import DATETIME
 from datetime import datetime
-from database import Base
+from class_management.database import Base
 
 class ClassInfo(Base):
-    __tablename__ = 'class'
+    __tablename__ = 'classes'
 
     id = Column(Integer
                 ,primary_key=True
@@ -20,16 +20,16 @@ class ClassInfo(Base):
                         ,comment='班级名称'
                         )
     head_teacher_id = Column(Integer
-                            ,ForeignKey('teacher.id')
+                            # ,ForeignKey('teacher.id')
                             ,comment='班主任编号'
                             )
 
     coach_teacher_id = Column(Integer
-                              ,ForeignKey('teacher.id')
+                              # ,ForeignKey('teacher.id')
                               ,comment='授课老师编号'
                               )
     tutor_teacher_id = Column(Integer
-                              ,ForeignKey('teacher.id')
+                              # ,ForeignKey('teacher.id')
                               ,comment='助教老师编号'
                               )
     # class_teacher = Column(String(50)