try exception 捕获异常

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a=1b=2try:  a/b  print 2222except:  print 3333C:\Python27\python.exe C:/Users/TLCB/PycharmProjects/untitled/mycompany/thread/p12.py2222a=1b=0try:  a/b  print 2222except:  print 3333C:\Python27\python.exe C:/Users/TLCB/PycharmProjects/untitled/mycompany/thread/p12.py3333def main(req):      print req.session      try:        a=req.session['username']        return render_to_response('login.html')      except:          return redirect('/index/')

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