作业day8-元祖、字典

使用一个变量all_students保存一个班的学生信息(4个)，每个学生需要保存：姓名、年龄、成绩、电话

all_students = [
    {'name':'stu1', 'age': 19, 'score':81, 'tel':'192222'},
    {'name':'stu2', 'age': 29, 'score':90, 'tel':'211222'},
    {'name':'stu3', 'age': 12, 'score':67, 'tel':'521114'},
    {'name':'stu4', 'age': 30, 'score':45, 'tel':'900012'},
] 

1.添加学生：输入学生信息，将输入的学生的信息保存到all_students中

"""
例如输入：
姓名: 小明
年龄: 20
成绩: 100
电话: 111922  
那么就在all_students中添加{'name':'小明', 'age': 20, 'score': 100, 'tel':'111922'}
"""

stu_name = input('输入学生name: ')
stu_age = int(input('输入学生age: '))
stu_score = int(input('输入学生score: '))
stu_tel = int(input('输入学生tel: '))
add_stu = {'name': stu_name, 'age': stu_age, 'score': stu_score, 'tel': stu_tel}
all_students.append(add_stu)
for item in all_students:
    print(item)

2.按姓名查看学生信息：

"""
例如输入:
姓名: stu1 就打印：'name':'stu1', 'age': 19, 'score':81, 'tel':'192222'
"""

l_name = input('输入name: ')
for stu_massage in all_students:
    if stu_massage['name'] == l_name:
        print(stu_massage)
        break
else:
    print('没有该学生信息！')

3.求所有学生的平均成绩和平均年龄

list_score = []
list_age = []
for stu_massage in all_students:
    list_score.append(stu_massage['score'])
    list_age.append(stu_massage['age'])
average_score = sum(list_score) / len(all_students)
average_age = sum(list_age) / len(all_students)
print('平均年龄:{},平均成绩:{}'.format(average_age, average_score))

4.删除班级中年龄小于18岁的学生

#1.
all_students1 = all_students[:]
all_students.clear()
for stu_massage in all_students1:
    if stu_massage['age'] >= 18:
        all_students.append(stu_massage)
print(all_students)

#2.
for stu_massage in all_students[:]:
    if stu_massage['age'] < 18:
        all_students.remove(stu_massage)
print(all_students)

5.统计班级中不及格的学生的人数

num = 0
for stu_massage in all_students:
    if stu_massage['score'] < 60:
        num += 1
print('有%d人不及格'%num)

6.打印手机号最后一位是2的学生的姓名

for stu_massage in all_students:
    if int(stu_massage['tel'][-1]) == 2:
        print(stu_massage['name'])