Simple or Impossible in Python... dynamically dereferencing a class attribute

[Bill Sneddon]

Given the following simple code.  I was trying find a way to
  dynamically de-reference a class attribute.  Problem explained below.


class test:
  	def __init__(self):
  		self.a = 0
  		self.b = 0
  		self.c = 0

myDict = {}
myDict['one'] = test()
myDict['two'] = test()

# I know I can do this at runtime.
myVar = 7
myDict['one'].a = myVar
myLetter = 'b'

## Is there any way to choose the attribute of test based on a varible.
## like this?

myDict['one'].{myLetter} = 9

I know you can do this kind of thing with other languages Perl, C++

Is it possible with Python?

If so what is the syntax in Python.

Maybe there is a better/equivalent approach if so could you point me
to an example?