'''----------------------------学生成绩系统---------------------------------------------'''
class Student:
def __init__(self,No,Name,Gender,Age):
self.No=No
self.Name=Name
self.Gender=Gender
self.Age=Age
def show(self):
print("%-16s %-16s %-8s %-4d" % (self.No,self.Name,self.Gender,self.Age))
class StudentList:
def __init__(self):
self.students = []
def show(self):
print("%-16s%-16s%-8s%-4s" % ("No","Name","Gender","Age"))
for s in self.students:
s.show()
def __insert(self,s):
i=0
while(i<len(self.students)and s.No>self.students[i].No):
i=i+1
if(i<len(self.students)and s.No==self.students[i].No):
print(s.No+"已经存在")
return False
self.students.insert(i,s)
print("增加成功")
return True
def __update(self,s):
flag=False
for i in range(len(self.students)):
if(s.No==self.students[i].No):
self.students[i].Name=s.Name
self.students[i].Gender=s.Gender
self.students[i].Age=s.Age
print("修改成功")
flag=True
break
if(not flag):
print("没有这个学生")
return flag
def __delete(self,No):
flag = False
for i in range(len(self.students)):
if(self.students[i].No == No):
del self.students[i]
print("删除成功")
flag=True
break
if(not flag):
print("没有这个学生")
return flag
def delete(self):
No = input("No=")
if (No !=""):
self.__delete(No)
def insert(self):
No = input("No=")
Name = input("Name=")
while True:
Gender = input("Gender=")
if (Gender == "男" or Gender == "女"):
break
else:
print("Gender is nat valid")
Age = input("Age=")
if (Age == ""):
Age=0
else:
Age=int(Age)
if No!="" and Name != "":
self.__insert(Student(No,Name,Gender,Age))
else:
print("学号、姓名不能为空")
def update(self):
No = input("No=")
Name = input("Name=")
while True:
Gender = input("Gender=")
if (Gender == "男" or Gender == "女"):
break
else:
print("Gender is nat valid")
Age = input("Age=")
if (Age == ""):
Age=0
else:
Age=int(Age)
if No!="" and Name != "":
self.__update(Student(No,Name,Gender,Age))
else:
print("学号、姓名不能为空")
def process(self):
while True:
s=input(">")
if(s == "show"):
self.show()
elif(s == "insert"):
self.insert()
elif(s == "update"):
self.update()
elif(s == "delete"):
self.delete()
elif(s == "exit"):
break
else:
print("show: show students")
print("insert: insert a new student")
print("update: insert a new student")
print("delete: delete a student")
print("exit: exit")
st = StudentList()
st.process()
