old_contents: from _botan import *
  
  # Initialize the library when the module is imported
  init = LibraryInitializer()
  
  class SymmetricKey(OctetString):
      pass
  
  class InitializationVector(OctetString):
      pass
  
  def Filter(name, key = None, iv = None, dir = None):
      if key != None and iv != None and dir != None:
          return make_filter(name, key, iv, dir)
      elif key != None and dir != None:
          return make_filter(name, key, dir)
      elif key != None:
          return make_filter(name, key)
      else:
          return make_filter(name)
  
  def Pipe(*filters):
      pipe = PipeObj()
      for filter in filters:
          if filter:
              pipe.append(filter)
      return pipe
  
new_contents: from _botan import *
  
  # Initialize the library when the module is imported
  init = LibraryInitializer()
  
subject: Remove old code in __init__.py