import os.path #导入os.path模块
def menm(): #菜单
print('==========================学生信息管理系统==========================')
print('------------------------------功能菜单-----------------------------')
print('\t\t\t 1.录入学生信息')
print('\t\t\t 2.查找学生信息')
print('\t\t\t 3.删除学生信息')
print('\t\t\t 4.修改学生信息')
print('\t\t\t 5.排序')
print('\t\t\t 6.统计学生总人数')
print('\t\t\t 7.显示所有学生信息')
print('\t\t\t 0.退出系统')
print('-------------------------------------------------------------------')
filename = 'student.txt'# 文件名
def main(): #主程序
while True:
menm() #调用菜单函数
choice = int(input('请选择'))
if choice in [0,1,2,3,4,5,6,7]:
if choice == 0:
answer = input('您确定要退出系统吗?y/n')
if answer == 'y' or answer == 'Y':
print('谢谢您的使用!!!')
break #退出系统
else:
continue
elif choice == 1:
insert() #录入学生信息
elif choice == 2:
search() #查找学生信息
elif choice == 3:
delete() #删除学生信息
elif choice == 4:
modify() #修改学生信息
elif choice == 5:
sort() #排序
elif choice == 6:
total() #统计学生总人数
elif choice == 7:
show() #显示所有学生信息
def insert():# 插入信息
student_list = []
while True: # 循环输入
id = input('请输入ID(如1001):')
if not id:# 防止手滑
break
name = input('请输入姓名:')
if not name:
break
try:
english = int(input('请输入英语成绩:'))
python = int(input('请输入python成绩:'))
java = int(input('请输入Java成绩:'))
except:
print('输入无效,不是整数类型,请重新输入')
continue
#将录入的学生信息保存到字典当中
student ={'id':id,'name':name,'english':english,'python':python,'java':java}
#将学生信息添加到列表中
student_list.append(student)
answer = input('是否继续添加?y/n\n')
if answer == 'y':
continue
else:
break
#调用save()函数
save(student_list)
print('学生信息录入完毕!!!')
def save(lst):# 保存
try:
stu_txt = open(filename,'a',encoding='utf-8')
except:
stu_txt = open(filename,'w',encoding='utf-8')
for item in lst:
stu_txt.write(str(item)+'\n')# 将内容写入文件中
def search(): # 搜索
student_query = []
while True:
id = ''
name = ''
if os.path.exists(filename): # 如果可以打开文件
mode = input('按ID查找请输入1,按姓名查找请输入2:')
if mode =='1':
id = input('请输入要查询的学生ID:')
elif mode =='2':
name = input('请输入学生姓名:')
else:
print('您的输入有误,请重新输入')
search()
with open(filename,'r',encoding='utf-8')as rfile:
student = rfile.readlines()
for item in student:
d = dict(eval(item))
if id != '':
if d['id'] == id:
student_query.append(d)
elif name != '':
if d['name'] == name:
student_query.append(d)
#显示查询结果
show_student(student_query)
#清空列表
student_query.clear()
answer = input('是否要继续查询?y/n\n')
if answer =='y':
continue
else:
break
else:
print('暂未保存学生信息')
return
def show_student(lst):
if len(lst)==0:
print('没有查询到学生信息,无数据显示!!!')
return
#定义标题显示格式
format_title='{:^6}\t{:^12}\t{:^8}\t{:^10}\t{:^10}\t{:^8}'
print(format_title.format('ID','姓名','英语成绩','python成绩','java成绩','总成绩'))
#定义内容的显示格式
format_data ='{:^6}\t{:^12}\t{:^8}\t{:^10}\t{:^10}\t{:^8}'
for item in lst:
print(format_data.format(item.get('id'),
item.get('name'),
item.get('english'),
item.get('python'),
item.get('java'),
int(item.get('english'))+int(item.get('python'))+int(item.get('java'))
))
def delete():
while True:
student_id = input('请输入要删除的学生的ID:')
if student_id != '':
if os.path.exists(filename):
with open(filename,'r',encoding='utf-8')as file:
student_old = file.readlines()
else:
student_old = []
flag = False #标记是否删除
if student_old:
with open(filename,'w',encoding='utf-8')as wfile:
d = {}
for item in student_old:
d = dict(eval(item)) #将字符串转成字典
if d['id'] != student_id:
wfile.write(str(d)+'\n')
else:
flag = True
if flag:
print(f'id为{student_id}的学生信息已被删除')
else:
print(f'没有找到ID为{student_id}的学生信息')
else:
print('无学生信息')
break
show() #删除之后要重新显示所有学生信息
answer = input('是否继续删除?y/n\n')
if answer == 'y':
continue
else:
break
def modify():
show()
if os.path.exists(filename):
with open(filename,'r',encoding='utf-8')as rfile:
student_old = rfile.readlines()
else:
return
student_id = input('请输入要修改的学员的ID:')
with open(filename,'w',encoding='utf-8')as wfile:
for item in student_old:
d = dict(eval(item))
if d['id'] == student_id:
print('找到学生信息,可以修改他的相关信息了!')
while True:
try:
d['name'] = input('请输入姓名:')
d['english'] = input('请输入英语成绩:')
d['python'] = input('请输入Python成绩:')
d['java'] = input('请输入java成绩:')
except:
print('您的输入有误,请重新输入!!!')
else:
break
wfile.write(str(d)+'\n')
print('修改成功!!!')
else:
wfile.write(str(d)+'\n')
answer = input('是否继续修改其他学生信息呢?y/n\n')
if answer == 'y':
modify()
def sort():
show()
if os.path.exists(filename):
with open(filename,'r',encoding='utf-8')as rfile:
student_list = rfile.readlines()
student_new = []
for item in student_list:
d = dict(eval(item))
student_new.append(d)
else:
return
asc_or_desc = input('请选择(0.升序 1.降序:)')
if asc_or_desc =='0':
asc_or_desc_bool =False
elif asc_or_desc =='1':
asc_or_desc_bool =True
else:
print('您的输入有误,请重新输入')
sort()
mode = input('请选择排序方式(1.按英语成绩排序 2.按python成绩排序 3.按java成绩排序 0.按总成绩排序):')
if mode == '1':
student_new.sort(key=lambda x:int(x['english']),reverse=asc_or_desc_bool)
elif mode == '2':
student_new.sort(key=lambda x:int(x['python']),reverse=asc_or_desc_bool)
elif mode == '3':
student_new.sort(key=lambda x:int(x['java']),reverse=asc_or_desc_bool)
elif mode == '0':
student_new.sort(key=lambda x:int(x['english'])+int(x['python'])+int(x['java']),reverse=asc_or_desc_bool)
else:
print('您的输入有误,请重新输入!!!')
sort()
show_student(student_new)
def total():
if os.path.exists(filename):
with open(filename,'r',encoding='utf-8')as rfile:
students = rfile.readlines()
if students:
print(f'一共有{len(students)}名学生')
else:
print('还未录入学生信息')
else:
print('暂未保存数据信息......')
def show():
student_lst = []
if os.path.exists(filename):
with open(filename,'r',encoding='utf-8')as rfile:
students=rfile.readlines()
for item in students:
student_lst.append(eval(item))
if student_lst:
show_student(student_lst)
else:
print('暂未保存过数据!!!')
if __name__ == '__main__':
main()
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