Python3学习笔记 根据标签截取内容

'''
Created on 2016年6月17日

@author: gionee
'''
def extract_from_tag(tag,line):
opener = "<" + tag +">"
closer = "</" + tag + ">"
try:
i = line.index(opener)
start = i + len(opener)
j = line.index(closer,start)
return line[start:j]
except ValueError:
return None

initline = "<div>今天的天气好晴朗，处处好风光!</div>"
line = extract_from_tag("div", initline)
print("第一种方法：%s" % line)

def extract_from_tag2(tag,line):
opener = "<" + tag +">"
closer = "</" + tag + ">"
i = line.find(opener)
if i != -1:
start = i + len(opener)
j = line.find(closer,start)
if(j !=-1):
return line[start:j]
return None

line = extract_from_tag2("div", initline)
print("第二种方法：%s" % line)

第一种方法：今天的天气好晴朗，处处好风光!
第二种方法：今天的天气好晴朗，处处好风光!