代码收藏家技术教程 2024-12-08

头歌Python作业——Python第八章作业（初级）

第1关统计字母数量

第2关统计文章字符数

第3关查询高校信息

第4关查询高校名

第5关通讯录读取

第6关 JSON转列表

第7关利用数据文件统计成绩

第8关研究生录取数据分析A

第9关图书数据分析(A)

第1关统计字母数量

n = int(input())
dic = {} 
f = open("step2/The Old Man and the Sea.txt", "r")
for i, line in enumerate(f): 
    if i >= n: 
        break
    for c in line.lower(): 
        if c.isalpha(): 
            dic[c] = dic.get(c, 0)+1  

l = sorted(dic.items(), key=lambda x: (-x[1], x[0]))
for k,v in l:
    print("{} 的数量是 {:>3} 个".format(k, v)) 
for c in 'abcdefghijklmnopqrstuvwxyz':
    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:
    num = int(input())
    txt = ''.join(f.readlines()[:num])
    print(len(txt), len(set(txt)))

第3关查询高校信息

with open('step4/university.csv', 'r', encoding='utf-8') as f:
    txt = f.readlines()
    s = input().strip()
    print(txt[0].strip())
    for line in txt:
        if s in line.split(',')[1]:
            print(line)
            break

第4关查询高校名

with open('step5/university.csv', 'r', encoding='utf-8') as f:
    name = input()
    for line in f.readlines():
        names = line.split(',')[1]
        if name in names:
            print(names)

第5关通讯录读取

s = input()
if s not in 'AD':
    print('ERROR')   
else:
    with open('step6/info.csv', 'r', encoding='utf-8') as f:
        if s == 'A':
            print(f.read().replace(',', ' '))
        else:
            dic = {}
            for line in f.readlines():
                l = line.strip().split(',')
                dic[l[0]] = l[1:]
            print(dic)

第6关 JSON转列表

import json

with open('step7/score1034.json', 'r', encoding='utf-8') as f:
    txt = json.loads(f.read())
    data = [['姓名', '学号', 'C', 'C++', 'Java', 'Python', 'C#', '总分']]
    for dic in txt:
        data.append(list(dic.values()))
    n = int(input())
    print(data[: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 = []
    for line in f.readlines():
        ls.append(line.strip('\n').split(','))
    ls.sort(key = lambda x:eval(x[9]))
    print('最低分{}分,最高分{}分'.format(ls[0][9], ls[-1][9]))
    print(ls[:n])
    if n <= len(ls):
        print(ls[(len(ls)-n):])
    else:
        print(ls)
    res = []
    for i in range(3, 9):
        num = 0
        for d in ls:
            num += eval(d[i])
        res.append(eval(f'{num/len(ls):.2f}'))
    print(res)

第8关研究生录取数据分析A

def readfile1(filename):
    with open(filename, 'r') as f:
        res = []
        for line in f.readlines()[1:]:
            ls = line.strip().split(',')
            if eval(ls[-1])>=0.8:
                res.append(ls)
        return res

def readfile2(filename):
    with open(filename, 'r') as f:
        ls1, ls2 = [], []
        for line in f.readlines()[1:]:
            ls = line.strip().split(',')
            if eval(ls[-1])>=0.9:
                ls1.append(ls)
            if eval(ls[-1])<=0.7:
                ls2.append(ls)
        return ls1, ls2
    
n = input()
filename = "step9/admit2.csv"
if n == '1':
    ls = readfile1(filename)
    count = 0
    for d in ls:
        if eval(d[1])>=4:
            count += 1
    print("Top University in >=80%%:%.2f%%"%(count/len(ls)*100))
elif n == 'Research':
    ls1, ls2 = readfile2(filename)
    count1 = len([0 for d in ls1 if d[-4]=='1'])
    count2 = len([0 for d in ls2 if d[-4]=='1'])
    print("Research in >=90%%:%.2f%%"%(count1/len(ls1)*100))
    print("Research in <=70%%:%.2f%%"%(count2/len(ls2)*100))
elif n == '2':
    ls = [eval(d[3]) for d in readfile1(filename)]
    print("TOEFL Average Score:%.2f"%(sum(ls)/len(ls)))
    print("TOEFL Max Score:%.2f"%max(ls))
    print("TOEFL Min Score:%.2f"%min(ls))
elif n == '3':
    ls= [eval(d[-5]) for d in readfile1(filename)]
    print("CGPA Average Score:%.3f"%(sum(ls)/len(ls)))
    print("CGPA Max Score:%.3f"%max(ls))
    print("CGPA Min Score:%.3f"%min(ls))
else:
    print("ERROR")

第9关图书数据分析(A)

def MaxName(l, n):
    res = sorted(l, key=lambda x:(len(x[1]), eval(x[3])), reverse=True)
    for d in res[:n]:
        print(d[1])
 
def MinName(l, n):
    res = sorted(l, key=lambda x:(len(x[1])))
    for d in res[:n]:
        print(d[1])
 
def PriceNow(l): 
    res = sorted(l, key=lambda x:eval(x[3]), reverse=True)
    for i in res[0][:-3]:
        print(i)
    for i in res[-1][:-3]:
        print(i)
 
def PriceOrgin(l):
    res = sorted(l, key=lambda x:eval(x[3]), reverse=True)
    for i in res[0][:-3]:
        print(i)
    for i in res[-1][:-3]:
        print(i)
 
def MaxComment(l): 
    res = sorted(l, key=lambda x:eval(x[-2][:-3]), reverse=True)
    for i in res[:10]:
        print(i[1], i[-2])
 
def MinComment(l):
    res = sorted(l, key=lambda x:eval(x[-2][:-3]))
    for d in res[:10]:
        print(d[1], d[-2])
 
def Rank(l):
    n = input()
    for d in l:
        if n == d[0]:
            for i in d:
                print(i)
            break
 
with open('step10/CBOOK.csv', 'r') as f:
    l = [line.strip().split(',') for line in f.readlines()[1:]]
    c = input().lower()

    if c == 'record':
        print(len(l))
    elif c == 'rank':
        Rank(l)
    elif c == 'maxname':
        n=eval(input())
        MaxName(l, n)
    elif c == 'minname':
        n = eval(input())
        MinName(l, n)
    elif c == 'nprice':
        PriceNow(l)
    elif c == 'oprice':
        PriceOrgin(l)
    elif c == 'maxcomment':
        MaxComment(l)
    elif c == 'mincomment':
        MinComment(l)
    else:
        print('无数据')