正则表达式，匹配之后截取字符串
str = '''< HTTP/1.1 500 Internal Server Error
< Server: nginx/0.7.65
< Date: Wed, 02 Apr 2014 05:05:04 GMT
< Content-Type: application/json;charset=utf-8
< Connection: keep-alive
< Status: 500 Internal Server Error
< Content-Length: 53
< X-Content-Type-Options: nosniff
{"error_code":90001,"error_message":"token_rejected"} '''
使用下面的方法能只取到 500
o = re.findall(r"< Status: (\d+) \D*\n",str)
所以说，把自己想要的用（）括起来， 这样就能在匹配的字符串中取到想要的东东
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