【头歌-Python】Python第八章作业（初级）_【头歌-python】python第八章作业(初级)

第1关：统计字母数量

import string
n = int(input())
dic = {} 
f = open("step2/The Old Man and the Sea.txt", "r")
 
i = 0
for line in f:
    if i>=n:
        break
    else:
        i+=1
        for word in line.lower():
            if word.isalpha():
                dic[word] = dic.get(word, 0)+1 
 
list = sorted(dic.items(), key=lambda x: (-x[1], x[0]))
for x1,x2 in list:
    print("{} 的数量是 {:>3} 个".format(x1, x2)) 
for c in string.ascii_lowercase:
    if c not in dic:
        print(f"{c} 的数量是 {0:>3} 个")

第2关：统计文章字符数

with open('step3/The Great Learning.txt', 'r', encoding='utf-8') as f:
    n =int(input())
    text = ''.join(f.readlines()[:n])
    sum1 = len(text)
    sum2 = len(set(text))
    print(sum1, sum2)

第3关：查询高校信息

with open('step4/university.csv','r',encoding='utf-8') as Uname:
    ls = Uname.readlines()
    name = input()
    print(ls[0].strip())
    for i in ls:
        if name in i.split(','):
            print(i)
            break

第4关：查询高校名

with open('step5/university.csv','r',encoding='utf-8') as Uname:
    ls = Uname.readlines()
    key = input()
    for i in ls:
        if key in i.split(',')[1]:
            print(i.split(',')[1])
        
    
            

第5关：通讯录读取   

a = input()
if a in 'AD':
    with open('step6//info.csv','r',encoding='utf-8') as f: 
        if a=='A':
            print(f.read().replace(',',' '))  
        elif a=='D':
            dic = {}
            ls = f.readlines()
            for i in ls:
                lst = i.strip().split(',')
                dic[lst[0]] = [lst[1],lst[2]]
            print(dic)
else:
    print('ERROR')
 
    

第6关：JSON转列表     

import json
 
with open('step7/score1034.json', 'r', encoding='utf-8') as f:
    text = json.loads(f.read())
    ls = [['姓名', '学号', 'C', 'C++', 'Java', 'Python', 'C#', '总分']]
    for i in text:
        ls.append(list(i.values()))#获取字典中所有值
    n = int(input())
    print(ls[:n])

第7关：利用数据文件统计成绩

with open('step8/成绩单.csv', 'r', encoding='utf-8') as f:
    n = int(input())
    ls = []
    av = [0,0,0,0,0,0]
    for line in f.readlines():
        ls.append(line.strip('\n').split(','))
        for j in range(3,9):
            av[j-3] = av[j-3]+int(line.split(',')[j])
    ls.sort(key = lambda x:int(x[9]))
    print('最低分{}分,最高分{}分'.format(ls[0][9], ls[-1][9]))
    print(ls[:n])#前n排数据
    if n <= len(ls):
        print(ls[(len(ls)-n):])#后n排数据
    else:
        print(ls)
    lst = []
    for j in range(0,6):
            lst.append(float(f'{int(av[j])/len(ls):.2f}'))
    print(lst)
    
           

   第8关：研究生录取数据分析A

def one(filename):
    with open(filename, 'r') as f:
        ls = []
        for line in f.readlines()[1:]:
            res = line.strip().split(',')
            if eval(res[-1]) >= 0.8:
                ls.append(res)
        return ls
 
 
def two(filename):
    with open(filename, 'r') as f:
        ls1 = []
        ls2 = []
        for line in f.readlines()[1:]:
            res = line.strip().split(',')
            if eval(res[-1]) >= 0.9:
                ls1.append(res)
            elif eval(res[-1]) <= 0.7:
                ls2.append(res)
        return ls1, ls2
 
 
def main():
    n = input()
    filename = 'step9//admit2.csv'
    if n == '1':
        ls = one(filename)
        count = 0
        for i in ls:
            if eval(i[1]) >= 4:
                count += 1
        print('Top University in >=80%:{:.2f}%'.format(count / len(ls) * 100))
    elif n == 'Research':
        ls1, ls2 = two(filename)
        count = 0
        
        for i in ls1:
            if i[-4] == '1' :
                count+=1
        print('Research in >=90%:{:.2f}%'.format(count / len(ls1) * 100))
        count = 0
        for i in ls2:
            if i[-4] == '1' :
                count+=1
        print('Research in <=70%:{:.2f}%'.format(count / len(ls2) * 100))
    elif n == '2':
        ls = [eval(i[3]) for i in one(filename)]
        print('TOEFL Average Score:{:.2f}'.format(sum(ls) / len(ls)))
        print('TOEFL Max Score:{:.2f}'.format(max(ls)))
        print('TOEFL Min Score:{:.2f}'.format(min(ls)))
    elif n == '3':
        ls = [eval(i[4]) for i in one(filename)]
        print('CGPA Average Score:{:.3f}'.format(sum(ls) / len(ls)))
        print('CGPA Max Score:{:.3f}'.format(max(ls)))
        print('CGPA Min Score:{:.3f}'.format(min(ls)))
    else:
        print("ERROR")
 
 
main()
 
 
 
 
 

第9关：图书数据分析（A）

with open('step10/CBOOK.csv', 'r') as f:
    ls = [line.strip().split(',') for line in f.readlines()[1:]]
    n = input()
    if n == 'record':
        print(len(ls))
    elif n == 'rank':
        num = input()
        for i in ls:
            if i[0] == num:
                for j in i:
                    print(j)
    elif n=='maxcomment':
        res = sorted(ls,key=lambda x:eval(x[5][:-3]),reverse = True)
        for i in res[:10]:
            print(i[1],i[5])
    elif n=='maxname':
        num =int(input())
        res = sorted(ls,key=lambda x:len(x[1]),reverse = True)
        for i in res[:num]:
            print(i[1])
    else:
        print('无数据')