Merge remote-tracking branch 'origin/geyuan1' into lon_students_merge_code_test

# Conflicts:
#	class_management/dao/class_management_dao.py
#	class_management/main.py
#	students/README_students.md

students/model/students_model.py

@@ -30,7 +30,7 @@ class Students(Base_all):
                  , comment='年龄'
                  , nullable=False)
 
-    sex = Column(Enum(SexEnum, values_callable=lambda e: [i.value for i in e])
+    sex = Column(Enum(SexEnum)
                  , comment='性别'
                  , nullable=False)
 
@@ -49,7 +49,7 @@ class Students(Base_all):
     graduate_time = Column(DATETIME
                            , comment='毕业时间')
 
-    education = Column(Enum(EducationEnum, values_callable=lambda e: [i.value for i in e])
+    education = Column(Enum(EducationEnum)
                        , comment='学历'
                        , nullable=True)