python基础学习第四天

时间：2022-07-24 15:17:53
#字符串到数字 可以进行各种进制转换
#print(int('11111',8))

#需求  对字符串中的单词翻转 保留空格
#第一种方法 最笨
clstr='I love you!'
bam=clstr.split(' ')
rebam=bam[2]+' '+bam[1]+' '+bam[0]
#print(rebam)
#第二种方法
def reverse_word(s):
    s1=s.split(' ')
    i=0
    j=len(s1)-1
    while i<j:
        """
        temp=s1[i]
        s1[i]=s1[j]
        s1[j]=temp
       """
        #直接交换位置
        s1[i],s1[j]=s1[j],s1[i]
        i+=1
        j-=1
    return ' '.join(s1)

#字典 dict
def func(p):
    print('x=',p['x'])
    print('y=',p['y'])
#**表示是一个字典 key/value类型
def dcfunc(name,**dicaddr):
    print(name)
    print(type(dicaddr))
    print(dicaddr)
#可变参数 *numberis 是一个可变的参数 tuple
def tufunc(name,*numbers):
    print(type(numbers))
    print(numbers)

#递归
def my_sum(i):
    if i < 0:
        raise ValueError
    elif i <= 1:
        return i
    else:
        return i + my_sum(i-1)
#斐波那数列
def feibona(count):
    a=1
    b=1
    while a<count:
        print(a)
        a,b=b,a+b
def fibo(num):
    if num==1 or num==2:
        return 1
    else:
        return fibo(num-2)+fibo(num-1)
#print(fibo(15))
def gerFiboList(num):
    fiboList=[]
    for i in range(1,num+1):
        fiboList.append(fibo(i))
    return fiboList
#print(gerFiboList(15))

def hano(n,a,b,c):
    print(n)
    if n==1:
        print(a,"->",c)
    else:
        #将n-1个盘子从x->y
        hano(n-1,a,c,b)
        #将剩余的最后一个盘子从x->z
        hano(1,a,b,c)
        #将剩余的n-1个盘子从y->z
        hano(n-1,b,a,c)

if __name__=='__main__':
    s='I love you! hello world'
    #print(reverse_word(s))
    #func({'x':100,'y':200})
    #tuple 元组
    #tufunc('jack',2,34,45,32,3)
    #dcfunc('batman',china='北京',eluoshi='克林姆宫',taiguo='曼谷')
    #print(my_sum(1))
    #print(my_sum(2))
    #print(my_sum(5))

    #feibona(50)
    #gerFiboList(50)
    print('---------------------')
    #print(gerFiboList(20))
    #print(fibo(20))
    hano(4,'A','B','C')

import urllib.parse

import urllib.request

import re

import os

def handle_request(url,page):

    url = url+str(page)+'/'

    headers={

    'User-Agent':'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.67 Safari/537.36',

    }

    request=urllib.request.Request(url=url,headers=headers)

    return request

def download_image(content):

    pattern=re.compile(r'<div class="thumb">.*?<img src="(.*?)".*?>.*?</div>',re.S)

    lt=pattern.findall(content)

    #print(lt)

    for link in lt:

        link='https:'+link

        dirname='qiutu'

        if not os.path.exists('qiutu'):

            os.mkdir(dirname)

        filename=link.split('/')[-]

        filepath=dirname+'/'+filename

        print('%s图片开始下载......'%filename)

        urllib.request.urlretrieve(link,filepath)

        print('%s图片结束下载......'%filename)

def main():

    url='http://www.qiushibaike.com/pic/page/'

    start_page=int(input("请输入起始页码:"))

    end_page=int(input("请输入结束页码:"))

    for page in range(start_page,end_page+):

        print('第%s页开始下载......'%page)

        print('*'*)

        request=handle_request(url,page)

        content=urllib.request.urlopen(request).read().decode()

        #print(content)

        #解析内容，提取所有的图片链接，下载图片

        download_image(content)

        print('第%s页结束下载......'%page)

        print('*'*)

if __name__=='__main__':

    main()

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