# coding:utf-8

students = {
1: {
'name': 'dewei',
        'age': 19,
        'class_number': 'A',
        'sex': 'boy',
    },
    2: {
'name': '小慕',
        'age': 15,
        'class_number': 'B',
        'sex': 'boy'
    },
    3: {
'name': '小曼',
        'age': 14,
        'class_number': 'A',
        'sex': 'girl'
    },
    4: {
'name': '小高',
        'age': 17,
        'class_number': 'A',
        'sex': 'boy'
    },
    5: {
'name': '小云',
        'age': 16,
        'class_number': 'B',
        'sex': 'girl'
    }
}
def check_user_info(**kwargs):  # 检查数据
    if 'name' not in kwargs:
return '没有发现学生姓名'
    if 'age' not in kwargs:
return '没有发现学生年龄'
    if 'class_number' not in kwargs:
return '没有发现学生班级'
    if 'sex' not in kwargs:
return '没有发现学生性别'
    return True


def get_all_students():  # 读取数据库内所有的数据
    for id_, value in students.items():
print('学号：{}， 姓名：{}， 年龄：{}，班级：{}，性别：{}'.format(
            id_, value['name'], value['age'], value['class_number'], value['sex']
        ))
return students
# get_all_students()

def add_students(**kwargs):  # 添加数据
    check = check_user_info(**kwargs)
if check != True:
print(check)
return
    id_ = max(students) + 1
    students[id_] = {
'name': kwargs['name'],
        'age': kwargs['age'],
        'sex': kwargs['sex'],
        'class_number': kwargs['class_number']
    }


# add_students(name='小白', age=16, sex='boy', class_number='A')
# get_all_students()

def delete_students(students_id):  # 删除数据
    if students_id not in students:
print('{}并不存在'.format(students_id))
else:
        user_info = students.pop(students_id)
print('学号是{}，{}同学的信息已被删除'.format(students_id, user_info['name']))

# delete_students(1)
# add_students(name='小白', age=16, sex='boy', class_number='A')
# get_all_students()

def update_student(student_id, **kwargs): #  更改数据
    if student_id not in students:
print('{}该学号不存在'.format(student_id))
    check = check_user_info(**kwargs)
if check != True:
print(check)
return
    students[student_id] = kwargs
print('同学信息更新完毕')

update_student(1, name='dewei', age=22, class_number='A', sex='boy')
get_all_students()

def get_user_by_id(student_id): #  根据学号查询
    return students.get(student_id)

print(get_user_by_id(1))

def search_users(**kwargs):  # 根据年龄班级姓名性别查询
    values = list(students.values())
key = None
    value = None
    result = []
if 'name' in kwargs:
        key = 'name'
        value = kwargs[key]
elif 'sex' in kwargs:
        key = 'sex'
        value = kwargs['sex']
elif 'class_number' in kwargs:
        key = 'class_number'
        value = kwargs[key]
elif 'age' in kwargs:
        key = 'age'
        value = kwargs[key]
else:
print('没有发现搜索的关键字')
return

    for user in values:
if user[key] == value:
            result.append(user)
return result
print('----------')
users = search_users(sex='boy')
print(users)