Simple Object assignment giving me errors

Wed Feb 12 16:18:02 EST 2014

This is from the book 'dive into python'. I am trying to define jeez as being an instance of FileInfo.
class UserDict(object):
	def __init__(self, dict = None):
		self.data = {}
		if dict is not None: self.update(dict)
class FileInfo(UserDict):
	def __init__(self, filename=None):
		UserDict.__init__(self)
		self["name"] = filename
jeez = FileInfo("yo")
I get a TypeError: 'FileInfo' object doesn't support item assignment .
Am I missing something?