Dynamically Defined Functions in Classes?

[Mark Pilgrim]

In article <mailman.980958702.3721.python-list at python.org>,
  purp at wildbrain.com wrote:
> I have an application in which I wish to treat the members of a
> dictionary as attributes; that is, I want to use set-and-get functions
> to access them.

Sounds like you want a UserDict, which is a class that acts like a
dictionary.

from UserDict import UserDict

defaultFoo = {'joe' : 'cool', 'frank' : 'lee', 'ron' : 'dell'}

class Bar(UserDict):
  def __init__(self):
    UserDict.__init__(self, defaultFoo)

>>> b = Bar()
>>> b
{'ron': 'dell', 'joe': 'cool', 'frank': 'lee'}
>>> b["joe"]
'cool'
>>> b["mark"] = "pilgrim"
>>> b
{'mark': 'pilgrim', 'ron': 'dell', 'joe': 'cool', 'frank': 'lee'}

If you need to customize the getting and setting of attributes, you can
use the special methods __getitem__ and __setitem__ in your Bar class.

More on special methods in UserDict and its descendants:
http://diveintopython.org/fileinfo_specialmethods.html
http://python.org/doc/current/ref/sequence-types.html

-M
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