对于同一个页面，几乎同样的代码，在Python3，windows8环境下能够正常解析运行。但是把代码移植到Ubuntu，Python2.7下面之后，会出现获取的网页不能被beautifulsoup解析，find_all('table')返回空节点的情况。
出问题的代码的一部分（可以运行）：

 python


 #coding:utf-8
import sys
reload(sys)
sys.setdefaultencoding('utf-8')
import urllib2
from bs4 import BeautifulSoup
postdata = "T1=&T2=1&T3=&T4=&T5=&APPDate=&T7=&T8=&T9=&PRDate=&T11=&SQDate=&JDDate=&T14=&T15=&T16=&T17=&SDDate=&T19=&T20=&T21=&D1=%B8%B4%C9%F3&D2=jdr&D3=%C9%FD%D0%F2&C1=fm&C2=&C3=&page=70"
postdata = postdata.encode('utf-8')
headers = {'User-Agent':'Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.6) Gecko/20091201 Firefox/3.5.6','Referer':'http://app.sipo-reexam.gov.cn/reexam_out/searchdoc/searchfs.jsp'}
req = urllib2.Request(
      url = "http://app.sipo-reexam.gov.cn/reexam_out/searchdoc/searchfs.jsp",
      headers = headers,
      data = postdata)
fp  = urllib2.urlopen(req)
mybytes = fp.read().decode('gbk').encode('utf-8')
soup = BeautifulSoup(mybytes,from_coding="uft-8")
print soup.original_encoding
print soup.prettify()

求指点一二