import os.path
filename = 'student.txt'
def main():
while True:
menu()
choice = int(input('请选择'))
if choice in [0, 1, 2, 3, 4, 5, 6, 7]:
if choice == 0:
answer = input('你确定要退出系统?y/n')
if answer == 'y' or answer == 'Y':
print('谢谢您的使用！')
break
else:
continue
elif choice == 1:
return insert()
elif choice == 2:
return search()
elif choice == 3:
return delete()
elif choice == 4:
return modify()
elif choice == 5:
return sort()
elif choice == 6:
return total()
elif choice == 7:
return show()
def menu():
print('===========================学生信息管理系统==============================')
print('------------------------------功能菜单---------------------------------')
print('ttt1.录入学生信息')
print('ttt2.查找学生信息')
print('ttt3.删除学生信息')
print('ttt4.修改学生信息')
print('ttt5.排序')
print('ttt6.统计学生总人数')
print('ttt7.显示所有学生信息')
print('ttt0.退出系统')
print('----------------------------------------------------------------------')
def insert():
student_list = []
while True:
id = input('请输入ID（例如1001）:')
if not id: # 空id为False
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')
continue
# 将录入信息保存到字典
student = {'id': id, 'name': name, 'english': english, 'python': python, 'java': java}
# 将学生字典添加到列表中
student_list.append(student)
answer = input('是否继续添加？y/nn')
if answer == 'y' or answer == 'Y':
continue
else:
# 调用save()函数
save(student_list)
print('学生信息录入完毕！')
return main()
def save(lst):
try:
stu_txt = open(filename, 'a', encoding='utf-8') # 如果有，则添加
except:
stu_txt = open(filename, 'w', encoding='utf-8') # 如果没有，则写入
for item in lst:
stu_txt.write(str(item) + 'n')
stu_txt.close()
def show_student(lst):
# 定义标题显示格式
format_title = '{:^6}t{:^10}t{:^8}t{:^10}t{:^10}t{:^10}' # ^居中对齐，>右对齐，<左对齐
print(format_title.format('ID', '姓名', '英语成绩', 'Python成绩', 'Java成绩', '总成绩')) # 注意中间不是逗号
format_data = '{:^6}t{:^10}t{:^10}t{:^10}t{:^10}t{:^12}'
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') + item.get('python') + item.get('java')))) # 也可item['id']...
def search():
while True:
mode = int(input('按ID查找请输入1，按姓名查询请输入2:n'))
with open(filename, 'r', encoding='utf-8') as file:
student = file.readlines()
student_query = [] # 定义列表
if mode == 1:
id = input('请输入学生ID:n')
flag0 = False
for item in student:
c = dict(eval(item))
if id in c.values():
flag0 = True
# 将学生字典添加到列表中
student_query.append(c.copy())
show_student(student_query)
if not flag0:
print('没有查询到学生信息，，请重新输入')
search()
elif mode == 2:
name = input('请输入学生姓名:')
d = {}
flag1 = False
for item in student:
d = dict(eval(item))
if name in d.values():
flag1 = True
# 将学生字典添加到列表中
student_query.append(d.copy())
show_student(student_query)
if not flag1:
print('没有查询到学生信息，请重新输入')
search()
student_query.clear()
answer = input('是否要继续查询？y/nn')
if answer == 'y' or answer == 'Y':
continue
else:
return main()
def delete():
while True:
student_id = input('请输入要删除的学生的ID:n')
if student_id != '':
with open(filename, 'r', encoding='utf-8') as file:
student_old = file.readlines()
flag = False # 标记是否删除
if student_old: # 空为False,否则True
with open(filename, 'w', encoding='utf-8') as wfile: # 读取文件之后，再写入文件
d = {}
for item in student_old: # 遍历
d = dict(eval(item)) # 将列表转换成字典存入d中
if d['id'] != student_id: # 如果id和输入的内容，不相等的写入，相等的不写入→实现删除
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() # 删除后要重新显示所有学生信息
answer = input('是否继续删除？y/nn')
if answer == 'y' or answer == 'Y':
continue
else:
return main()
def modify():
while True:
student_id = input('请输入要修改的学生的ID:n')
with open(filename, 'r', encoding='utf-8') as file:
student_old = file.readlines()
c = {}
flag0 = False
for item in student_old:
c = dict(eval(item))
if student_id in c.values():
flag0 = True
if flag0:
with open(filename, 'r', encoding='utf-8') as file:
student_old = file.readlines()
flag = False # 标记是否修改
if student_old: # 空为False,否则True
with open(filename, 'w', encoding='utf-8') as wfile: # 读取文件之后，再写入文件
d = {}
for item in student_old: # 遍历
d = dict(eval(item)) # 将列表转换成字典存入d中
if d['id'] != student_id: # 如果id和输入的内容，不相等的写入，相等的修改→实现修改
wfile.write(str(d) + 'n')
flag = False
else:
flag = True
print('找到学生信息，可以修改他的相关信息了！')
d['name'] = input('请输入姓名：n')
d['english'] = int(input('请输入英语成绩:n'))
d['python'] = int(input('请输入Python成绩:n'))
d['java'] = int(input('请输入Java成绩:n'))
wfile.write(str(d) + 'n')
print(f'id为{student_id}的学生信息已被修改')
answer = input('是否继续修改其他学生信息？y/nn')
if answer == 'y' or answer == 'Y':
modify()
else:
print('修改成功！！！')
show() # 修改后要重新显示所有学生信息
return main()
else:
print('您的输入有误，请重新输入')
modify()
def sort():
with open(filename, 'r', encoding='utf-8') as rfile:
students_lst = rfile.readlines()
students_new = []
for item in students_lst:
d = dict(eval(item))
students_new.append(d)
asc_or_desc = input('请选择(0.升序 1.降序)')
if asc_or_desc == '0': # 升序
asc_or_desc = False
elif asc_or_desc == '1': # 降序
asc_or_desc = 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': # 英语
students_new.sort(key=lambda x: int(x['english']), reverse=asc_or_desc)
# 函数作为参数传递,x代表列表每个元素，x['english']代表’english‘对应值
elif mode == '2': # Python
students_new.sort(key=lambda x: int(x['python']), reverse=asc_or_desc)
elif mode == '3': # Java
students_new.sort(key=lambda x: int(x['java']), reverse=asc_or_desc)
elif mode == '0': # 总成绩
students_new.sort(key=lambda x: int(x['english']) + int(x['python']) + int(x['java']), reverse=asc_or_desc)
else:
print('您的输入有误，请重新输入')
sort()
show_student(students_new)
return main()
def total():
with open(filename, 'r', encoding='utf-8') as rfile:
students = rfile.readlines()
if students:
print(f'一共有{len(students)}名学生信息')
else:
print('还没有录入学生信息')
return main()
def show():
with open(filename, 'r', encoding='utf-8') as rfile:
students = rfile.readlines()
student_lst = []
for item in students:
d = dict(eval(item))
student_lst.append(d.copy())
if len(d):
show_student(student_lst)
else:
print('没有学生信息')
return main()
if __name__ == '__main__':
if os.path.exists(filename):
main()
else:
print('暂未保存数据信息，文件不存在')
pass
