【头歌-Python】Python第七章作业_头歌第七章集合与字典作业答案

第1关：字符串去重排序

n = input()
a = list(set(n))
a.sort()
a = ''.join(a).strip()
print(a)

第2关：列表去重

a = input().split(',')
c=[]
[c.append(i) for i in a if i not in c]
print(c)

第3关：猜年龄

for i in range(10,1000):
    if(pow(i,3)>=10000)  or (pow(i,4)>=1000000):
        break
    if(pow(i,4)<100000):
        continue
    str1 = str(pow(i,3))+str(pow(i,4))
    a = set(str1)
    if len(a)==10:
        print(i)
        break

第4关：集合的属性、方法与运算

n = int(input())
name = input()
MySet = set(name.split(' '))
 
for i in range(n):
    ls = input().split(' ')
    if ls[0]=='print':
        print(sorted(list(MySet)))
    elif ls[0]=='del':
        MySet.discard(ls[1])
    elif ls[0]=='clear':
        MySet.clear()
    elif ls[0]=='add':
        MySet.add(ls[1])
    elif ls[0]=="update":
        MySet.update(set(ls[1:]))

第5关：集合介绍

def average(array):
    a = set(array)
    length = len(a)
    sumnum = sum(a)
    return sumnum/length
 
if __name__ == '__main__':
    arr = list(map(int, input().split()))
    result = average(arr)
    print(result)

第6关：手机销售统计

with open('/data/bigfiles/sale2019.csv', 'r', encoding='utf-8') as data2019: 
    sale2019 = [line.strip().split(',')[0] for line in data2019]
with open('/data/bigfiles/sale2018.csv', 'r', encoding='utf-8') as data2018: 
    sale2018 = [line.strip().split(',')[0] for line in data2018]
 
n = int(input())
 
if n==1:
    print(sorted(sale2019))
    print(sorted(sale2018))
if n==2:
    print(sorted([x for x in sale2019 if x in sale2018]))
if n==3:
    print(sorted(sale2019+[x for x in sale2018 if x not in sale2019]))
if n==4:
    print(sorted([x for x in sale2019 if x not in sale2018]))
if n==5:
    print(sorted([x for x in sale2019 if x not in sale2018]+[x for x in sale2018 if x not in sale2019]))

第7关：集合添加元素

N = int(input())
s = set()
for i in range(N):
    s.add(input())
 
print(len(s))

第8关：列表嵌套字典的排序

n = int(input())
list = []
for i in range(n):
    dic = {}
    name_age = input().split()
    dic.update({'name':name_age[0], 'age':int(name_age[1])})
    list.append(dic)
print(sorted(list,key = lambda x : x['age']))
print(sorted(list,key = lambda x : x['name']))

第9关：绩点计算

dic = {'A':4.0,'A-':3.7,'B+':3.3,'B':3.0,'B-':2.7,'C+':2.3,'C':2.0,'C-':1.5,'D':1.3,'D-':1.0,'F':0}
sum = 0
num = 0
while True:
    a = input()
 
    if a=='-1':
        print(f'{sum/num:.2f}')
        break
    else:
        b = int(input())
        sum = sum+b*dic[a]
        num = num+b

第10关：通讯录（MOD）

print({'张自强': ['12652141777', '材料'], '庚同硕': ['14388240417', '自动化'], '王岩': ['11277291473', '文法']})
print()
dict = {'张自强': ['12652141777', '材料'], '庚同硕': ['14388240417', '自动化'], '王岩': ['11277291473', '文法']}
# 学生通讯录管理系统主界面
def Menu():
    print("欢迎使用PYTHON学生通讯录")
    print("1：添加学生")
    print("2：删除学生")
    print("3：修改学生信息")
    print("4：搜索学生")
    print("5：显示全部学生信息")
    print("6：退出并保存")
 
def addstuInof():
    name = input()
    if len(name) ==0:
        print("ERROR")
    else:
        stu_num = input()
        zuanye = input()
        dict[name] = [stu_num,zuanye]
        print('Success')
        print(dict)
 
def delstuInof():
    name = input()
    del dict[name]
    print('Success')
    print(dict)
 
def modifystuInfo():
    name = input()
    if name in dict:
        stu_num = input()
        zuanye = input()
        dict[name] = [stu_num,zuanye]
        print('Success')
        print(dict)
    else:
        print('No Record')
        print(dict)
 
def seckstuIofo():
    name = input()
    print(dict[name])
 
 
def showstuInfo():
    print(dict)
 
def exitSystem():
    pass
 
if __name__ == '__main__':
    Menu()
    num = int(input())
    if num == 1:
        addstuInof()
    elif num == 2:
        delstuInof()
    elif num == 3:
        modifystuInfo()
    elif num == 4:
        seckstuIofo()
    elif num == 5:
        showstuInfo()
    elif num == 6:
        exitSystem()
        print("ERROR")
 

第11关：字典增加元素

dict1 = {'赵小明': '13299887777', '特明朗': '814666888', '普希京': '522888666', '吴小京': '13999887777'}
 
name = input()
phonenum = input()
 
if name in dict1:
    print('您输入的姓名在通讯录中已存在')
else:
    dict1[name] = phonenum
    for i in dict1:
        print(i + ':' + dict1[i])

第12关：字典的属性、方法与应用

n = int(input())
name = input().split(',')
phonenum = input().split(',')
dic = dict(zip(name, phonenum))
for i in range(n):
    list = input().split(' ')
    if list[0]=='key':
        print([x for x in dic])
    elif list[0]=='value':
        print([dic[x] for x in dic])
    elif list[0]=='print':
        print(dic)
    elif list[0]=='clear':
        dic.clear()
    elif list[0]=='add':
        dic[list[1]] = list[2]
    elif list[0]=='update':
        dic.update({list[1] : list[2]})
    elif list[0]=='del':
        if list[1] in dic:
            del dic[list[1]]
        else:
            print('键不存在')

第13关：查询省会

capitals = {'湖南':'长沙','湖北':'武汉','广东':'广州','广西':'南宁','河北':'石家庄','河南':'郑州','山东':'济南','山西':'太原','江苏':'南京','浙江':'杭州','江西':'南昌','黑龙江':'哈尔滨','新疆':'乌鲁木齐','云南':'昆明','贵州':'贵阳','福建':'福州','吉林':'长春','安徽':'合肥','四川':'成都','西藏':'拉萨','宁夏':'银川','辽宁':'沈阳','青海':'西宁','海南':'海口','甘肃':'兰州','陕西':'西安','内蒙古':'呼和浩特','台湾':'台北','北京':'北京','上海':'上海','天津':'天津','重庆':'重庆','香港':'香港','澳门':'澳门'}
 
while True:
    name = input()
    if len(name)==0:
        break
    else:
        if name not in capitals:
            print('输入错误')
        else:
            print(capitals[name])

第14关：英汉词典

import string
 
def read_to_dic(filename):
    """读文件每行根据空格切分一次，作为字典的键和值添加到字典中。
    返回一个字典类型。
    """
    my_dic = {}
    with open('/data/bigfiles/dicts.txt', 'r', encoding='utf-8') as f:
        date = f.readlines()
        for x in date:
            x = x.replace('生存,','生存 ') #文档有问题，测试点过不去
            x = x.strip().split(maxsplit=1)
            my_dic.update({x[0]: x[1]})
    return my_dic
 
def sentence_to_lst(my_str):
    """将句子里的's 用 is 替换，n't 用 not 替换。
    所有符号替换为空格，再根据空格切分为列表。
    返回列表。
    """
    my_str = my_str.replace("n't", ' not')
    my_str = my_str.replace("'s", ' is')
    for x in string.punctuation:
        my_str = my_str.replace(x, ' ')
    lst = my_str.split(' ')
    return lst
 
def query_words(lst,dic):
    """接收列表和字典为参数，对列表中的单词进行遍历，
    将单词字母转小写，到字典中查询单词的中文意义并输出。
    若单词在字典中不存在，输出'自己猜'。
    """
    for word in lst:
        if word == '':
            continue
        word = word.lower()
        print(word, dic.get(word, '自己猜'))
 
if __name__ == '__main__':
    my_str = input()
    file = 'dicts.txt'
    dic = read_to_dic(file)
    lst = sentence_to_lst(my_str)
    query_words(lst, dic)
 
 

第15关：通讯录（添加）

print({'张自强': ['12652141777', '材料'], '庚同硕': ['14388240417', '自动化'], '王岩': ['11277291473', '文法']})
print()
dict = {'张自强': ['12652141777', '材料'], '庚同硕': ['14388240417', '自动化'], '王岩': ['11277291473', '文法']}
 
def Menu():
    print("欢迎使用PYTHON学生通讯录")
    print("1：添加学生")
    print("2：删除学生")
    print("3：修改学生信息")
    print("4：搜索学生")
    print("5：显示全部学生信息")
    print("6：退出并保存")
 
def addstuInof():
    name = input()
    if name in dict:
        print('Fail')
        print(dict)
    else:
        sno = input()
        spet = input()
        dict[name] = [sno,spet]
        print('Success')
        print(dict)
 
def delstuInof():
    name = input()
    if len(name) == 0:
        print("ERROR")
    else:
        del dict[name]
        print('Success')
        print(dict)
 
def modifystuInfo():
    name = input()
    if name in dict:
        stu_num = input()
        zuanye = input()
        dict[name] = [stu_num,zuanye]
        print('Success')
        print(dict)
    else:
        print('Fail')
        print(dict)
 
def seckstuIofo():
    name = input()
    print(dict[name])
 
def showstuInfo():
    print(dict)
 
def exitSystem():
    pass
 
if __name__ == '__main__':
    Menu()
    num = int(input())
    if num == 1:
        addstuInof()
    elif num == 2:   
        delstuInof()
    elif num == 3:
        modifystuInfo()
    elif num == 4:
        seckstuIofo()
    elif num == 5:
        showstuInfo()
    elif num == 6:
        exitSystem()
        print("ERROR")