old_contents: #!/usr/bin/python
  #coding:utf-8
  import sys;
  try:
      1/0;
  except :# 所有异常
      print "Unexpected error:", sys.exc_info()[0]
  else:
      print 'no except';
  finally:
      print 'always excute';
  
new_contents: #!/usr/bin/python
  #coding:utf-8
  import sys;
  try:
      1/0;
      # raise BaseException('...'); 抛出异常
  except :# 所有异常
      print "Unexpected error:", sys.exc_info()[0]
  else:
      print 'no except';
  finally:
      print 'always excute';
  
subject: add raise