1.添加學(xué)生：輸入學(xué)生信息，將輸入的學(xué)生的信息保存到all_students中

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'},]
new_name = input('姓名：')
new_age = input('年齡：')
new_score = input('成績(jī)：')
new_tel = input('電話：')
new_student = {'name':new_name, 'age':new_age ,'score':new_score, 'tel':new_tel}
all_students.append(new_student)
print(all_students)

2.按姓名查看學(xué)生信息：

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'},]
new_name = input('姓名：')
for studet in all_students:
    if studet['name'] == new_name:
        print(studet)

3.求所有學(xué)生的平均成績(jī)和平均年齡

 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'},]
    sum_score = 0
    sum_age =0
    for student in all_students:
        sum_score += student['score']
        sum_age += student['age']
    print('平均成績(jī):',sum_score / len(all_students) , '平均年齡:',sum_age / len(all_students))

4.刪除班級(jí)中年齡小于18歲的學(xué)生

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'},]
index = 0
for student in all_students:
    index += 1
    if student['age'] < 18:
        del all_students[index-1]
print(all_students)

5.統(tǒng)計(jì)班級(jí)中不及格的學(xué)生的人數(shù)

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'},]
index = 0
for student in all_students:
    if student['score'] < 60:
        index += 1
print(index)

6.打印手機(jī)號(hào)最后一位是2的學(xué)生的姓名

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'},]
index = 0
for student in all_students:
    if student['tel'][-1] == '2':
        print(student['name'])