用正则表达式匹配出来的；
# 获取表单VIEWSTATE，EVENTVALIDATION的值 参数r是html
def get_VIEWSTATE(r):
pattern1=r'VIEWSTATE".*value=".*"'
match=re.search(pattern1,r).group(0);
pattern2=r'VIEWSTATE" id="__VIEWSTATE" value="'
match1=re.split(pattern2,match);
return match1[1][:-1]; #返回_VIEWSTATE
def get_EVENTVALIDATION(r):
pattern1=r'EVENTVALIDATION".*value=".*"'
match=re.search(pattern1,r).group(0);
pattern2=r'EVENTVALIDATION" id="__EVENTVALIDATION" value="'
match1=re.split(pattern2,match);
return match1[1][:-1]; #返回_EVENTVALIDATION
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