#查找index函数的帮助 help(str.index)
#for循环和break语句
from math import sqrt
for i in range(2,101):
flag=1
k=int(sqrt(i))
for j in range(2,k+1):
if i%j==0:
flag=0
break
if(flag):
print i#continue语句,满足条
from urllib.request import urlopen,Request
from bs4 import BeautifulSoup
import re
url="https://movie.douban.com/top250?start=50%filter="
hd = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64)
