[Python知识库]python考试

6、输出100以内的质数

for i in range(2, 101):
    for j in range(2, i//2+1):
        if i % j == 0:
            break
    else:
        print(i)

7、定义函数，判断用户名是否合法(至少包含一个大写字母，一个数
字)

import string

numbers = string.digits
upper = string.ascii_uppercase
name = "csdvvscADA2521s"

def check(name):
    num = 0
    upp = 0
    for i in name:
        if i in numbers:
            num = 1
        if i in upper:
            upp = 1

    if num == upp == 1:
        return True
    else:
        return False
if check(name):
    print("合法")
else:
    print("不合法")

8、使用递归，输出指定目录中所有的jpg文件

import os
dirname = input("请输入路径:")
def selectjpg(dirpatth):
    items = os.listdir(dirpatth)
    for item in items:
        item=os.path.join(dirpatth, item)
        if os.path.isdir(item):
            selectjpg(item)
        elif os.path.isfile(item):
            if item.endswith(".jpg"):
                print(os.path.basename(item))

selectjpg(dirname)

9、异常处理：处理"123"+4的异常

a = "123"
b = 4
try:
    c = a + b
except TypeError:
    print("类型错误")

10、图书管理系统，要保存的图书信息包
括：图书编号、书名、价格、库存量。键盘输入3本书的信息，分别以三种方式存储并完成输出。如果书名超过4个字，只显示4个字，其余
加‘.…’
方式一：使用元组存储一本书的信息，元组列表存储所有图书
方式二：使用字典存储所有图书信息，键为图书编号，值为“书名_价格库存量”
方式三：定义图书类(使用property封装属性)，使用对象列表存储所有图书

class book():
	@property
    def __init__(self, id, name, price, number):
        self.id = id
        self.name = name
        self.price = price
        self.number = number

    @property
    def show(self):
        return self.id, self.name, self.price, self.number


tu = tuple()
dic = {}
ls = []
for i in range(3):
    id = input("请输入图书编号:")
    name = input("请输入书名:")
    price = int(input("请输入价格:"))
    number = int(input("请输入库存:"))
    if i == 0:
        tu = (id, name, price, number)
    elif i == 1:
        dic[id] = [name, price, number]
    elif i == 2:
        ls.append(book(id, name, price, number))


def sl(bookname):
    if len(bookname) > 4:
        name = bookname[0:4] + "***"
        print('名字', name)
    else:
        print('名字', bookname)


print('图书编号', tu[0])
sl(tu[1])
print('价格', tu[2])
print('库存', tu[3])

for id, value in dic.items():
    print('图书编号', id)
    sl(value[0])
    print('价格', value[1])
    print('库存', value[2])
for i in ls:
    print('图书编号', i.id)
    sl(i.name)
    print('价格', i.price)
    print('库存', i.number)

11、使用多态模拟：宠物医生：给宠物看病宠物：狗狗生病了，就打针吃药；小鸟生病了，就包扎疗养

class Animal_doctor():
    def ill(self):
        print("给宠物看病")

class Dog(Animal_doctor):
    def ill(self):
        print("狗生病，打针吃药")

class Bird(Animal_doctor):
    def ill(self):
        print("小鸟生病，包扎疗养")
        
doctor = Animal_doctor()
dog = Dog()
bird = Bird()

def fun(obj):
    obj.ill()

12、文件读写：
1)随机产生10个4位数字组成的验证码，存储在code.txt文件中(一个验证码一行)
2)从code.txt中读出所有内容输出

import string
import random

a = string.digits + string.ascii_letters
def yanz():
    code = ""
    for i in range(4):
        code += random.choice(a)
    return code

with open('code.txt','w') as f:
    for i in range(10):
        f.write(yanz()+'\r')

with open('code.txt','r') as f:
    print(f.read())

13、使用爬虫下载图片

import requests

url = "https://pic.netbian.com/uploads/allimg/211109/221532-163646733295cd.jpg"
headers = {"User-Agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:90.0) Gecko/20100101 Firefox/90.0"}
respones = requests.get(url,headers = headers)
print("正在下载")
with open("E://"+'picture1.jpg','wb') as f:
    f.write(respones.content)
print("下载完成")