python实现下载指定网址所有图片的方法

#coding=utf-8
#download pictures of the url
#useage: python downpicture.py www.baidu.com
import os
import sys
from html.parser import HTMLParser
from urllib.request import urlopen
from urllib.parse import urlparse
def getpicname(path):
  '''  retrive filename of url    '''
  if os.path.splitext(path)[1] == '':
    return None
  pr=urlparse(path)
  path='http://'+pr[1]+pr[2]
  return os.path.split(path)[1]
def saveimgto(path, urls):
  '''
  save img of url to local path
  '''
  if not os.path.isdir(path):
    print('path is invalid')
    sys.exit()
  else:
    for url in urls:
      of=open(os.path.join(path, getpicname(url)), 'w+b')
      q=urlopen(url)
      of.write(q.read())
      q.close()
      of.close()
class myhtmlparser(HTMLParser):
  '''put all src of img into urls'''
  def __init__(self):
    HTMLParser.__init__(self)
    self.urls=list()
    self.num=0
  def handle_starttag(self, tag, attr):
    if tag.lower() == 'img':
      srcs=[u[1] for u in attr if u[0].lower() == 'src']
      self.urls.extend(srcs)
      self.num = self.num+1
if __name__ == '__main__':
  url=sys.argv[1]
  if not url.startswith('http://'):
    url='http://' + sys.argv[1]
  parseresult=urlparse(url)
  domain='http://' + parseresult[1]
  q=urlopen(url)
  content=q.read().decode('utf-8', 'ignore')
  q.close()
  myparser=myhtmlparser()
  myparser.feed(content)
  for u in myparser.urls:
    if (u.startswith('//')):
      myparser.urls[myparser.urls.index(u)]= 'http:'+u
    elif u.startswith('/'):
      myparser.urls[myparser.urls.index(u)]= domain+u
  saveimgto(r'D:\python\song', myparser.urls)
  print('num of download pictures is {}'.format(myparser.num))