改进了好多，还有哪里又错了-_-||？
Pycharm 半人工爬虫

# -*-coding:utf-8-*-
import re
import requests
from requests import get

f = open('source.txt', 'r',encoding='utf-8')
html = f.read()
f.close()
pic_url = re.findall('img src"(.*?)", class"lessonimg"', html, re.S)
i = 0
for each in pic_url:
print('now downloading:' + each)
pic = get(each)
fp = open('pic\\' + str(i)+'.jpg', 'web')
fp.write(pic.content)
fp.close()
i += 1