old_contents: # Python Security Project (PySec) and its related class files.
  #
  # PySec is a set of tools for secure application development under Linux
  #
  # Copyright 2014 PySec development team
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #   http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  #
  # -*- coding: ascii -*-
  """Module with statistics utilities."""
  
  
  __all__ = 'avg',
  
  
  def avg(*values):
      """Generator to calculate arithmetic mean"""
      n = -1.
      tot = .0
      for n, el in enumerate(values):
          tot += el
      n += 1.
      avg = 0 if n == 0. else tot/n
      while 1:
          el = (yield avg)
          if el is None:
              continue
          el = float(el)
          avg = (avg + el / n) / ((n + 1) / n)
          n += 1
  
  
new_contents: # Python Security Project (PySec) and its related class files.
  #
  # PySec is a set of tools for secure application development under Linux
  #
  # Copyright 2014 PySec development team
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #   http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  #
  # -*- coding: ascii -*-
  """Module with statistics utilities."""
  
  
  __all__ = 'avg',
  
  
  def avg(*values):
      """Generator to calculate arithmetic mean"""
      el = None
      n = float(len(values))
      tot = sum(float(val) for val in values)
      if n:
          avg = tot / n
      else:
          while el is None:
              el = (yield 0.)
          n = 1.
          avg = float(el)
      while 1:
          el = (yield avg)
          if el is None:
              continue
          el = float(el)
          avg = (avg + el / n) / ((n + 1) / n)
          n += 1
  
  
subject: fix ZeroDivisionError