python爬取图片并下载到本地

x = '1q2wwyxliuwyx3e4rwyxywshunwyx1q2wwyxxiangwyx3e4r'

y = re.findall('wyx.',x) # 可以将点号(.)理解为一个占位符，而且这个占位符可以代表一切字符
print(y)
y = re.findall('wyx...',x)
print(y)
y = re.findall('wyx*',x) # 星号(*)前一个字符为x，所以返回结果中可以找到x的任意次
print(y)
y = re.findall('wyx?',x) # 匹配前一个字符0次或1次，与星号的不同在于其最多匹配一次
print(y)
y = re.findall('wyx.*wyx',x) # 贪婪算法(.*)，返回wyx与wyx之间的所有内容
print(y)
y = re.findall('wyx.*?wyx',x) # 非贪婪算法(.*?)，尽可能少的返回满足正则表达式的结果
print(y)
y = re.findall('wyx(.*?)wyx',x) # 将想提取的内容抠下来
print(y)

output：
['wyxl', 'wyx3', 'wyxy', 'wyx1', 'wyxx', 'wyx3']
['wyxliu', 'wyx3e4', 'wyxyws', 'wyx1q2', 'wyxxia', 'wyx3e4']
['wyx', 'wyx', 'wyx', 'wyx', 'wyxx', 'wyx']
['wyx', 'wyx', 'wyx', 'wyx', 'wyx', 'wyx']
['wyxliuwyx3e4rwyxywshunwyx1q2wwyxxiangwyx']
['wyxliuwyx', 'wyxywshunwyx', 'wyxxiangwyx']
['liu', 'ywshun', 'xiang']

先把网页源代码copy到pic.txt

import os
import re
import requests
from lxml import etree

with open('pic.txt','r',encoding='utf-8') as f:
    comtent = f.read()
# print(comtent)
pic_url = re.findall(',comtent)

headers = {
    'User-Agent':'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.116 Safari/537.36'
}

path = os.path.join(os.getcwd(),'img')
if not os.path.exists(path):
    os.mkdir(path)
else:
    pass

n = 0
for i in pic_url:
    url = i
    picture = requests.get(url,headers=headers)
    with open(os.path.join(path,str(n)) + '.jpg' , 'wb') as fp:
	    fp.write(picture.content)
	    n += 1
	print(url,n)