old_contents: #!/usr/bin/env python
  
  from chunk import Chunk
  import logging
  import struct
  
  class Parser(object):
    ChunkAliasMap = {}
  
    def __init__(self, kind):
      self._kind = kind
      self._chunks = []
  
    def loadFile(self, filename):
      with open(filename) as iff:
        chunk = Chunk(iff)
  
        logging.error('Reading file "%s"' % filename)
  
        if chunk.getname() == 'FORM' and chunk.read(4) == self._kind:
          iff.seek(12)
  
          while True:
            try:
              chunk = Chunk(iff)
            except EOFError:
              break
  
            name = chunk.getname()
            size = chunk.getsize()
            data = chunk.read()
  
            logging.info('Encountered %s chunk of size %d' % (name, size))
  
            self._chunks.append(self._parseChunk(name, data))
        else:
          logging.error('File %s is not of IFF/%s type.' % (filename, self._kind))
          return False
  
      return True
  
    def _parseChunk(self, name, data):
      orig_name = name
  
      for alias, names in self.ChunkAliasMap.items():
        if name in names:
          name = alias
  
      handler = getattr(self, 'handle%s' % name, None)
  
      if handler:
        data = handler(data)
      else:
        logging.warning('No handler for %s chunk.' % orig_name)
  
      return (orig_name, data)
  
new_contents: #!/usr/bin/env python
  
  from chunk import Chunk
  import logging
  import struct
  
  class Parser(object):
    ChunkAliasMap = {}
  
    def __init__(self, kind):
      self._kind = kind
      self._chunks = []
  
    def loadFile(self, filename):
      with open(filename) as iff:
        chunk = Chunk(iff)
  
        logging.info('Reading file "%s"' % filename)
  
        if chunk.getname() == 'FORM' and chunk.read(4) == self._kind:
          iff.seek(12)
  
          while True:
            try:
              chunk = Chunk(iff)
            except EOFError:
              break
  
            name = chunk.getname()
            size = chunk.getsize()
            data = chunk.read()
  
            logging.debug('Encountered %s chunk of size %d' % (name, size))
  
            self._chunks.append(self._parseChunk(name, data))
        else:
          logging.error('File %s is not of IFF/%s type.' % (filename, self._kind))
          return False
  
      return True
  
    def _parseChunk(self, name, data):
      orig_name = name
  
      for alias, names in self.ChunkAliasMap.items():
        if name in names:
          name = alias
  
      handler = getattr(self, 'handle%s' % name, None)
  
      if handler:
        data = handler(data)
      else:
        logging.warning('No handler for %s chunk.' % orig_name)
  
      return (orig_name, data)
  
subject: Correct logging level for messages.