How to document fields and properties in Python?

Python has a PEP (257) that defines Docstring Conventions. Regarding documentation of attributes, it states:

String literals occurring immediately
after a simple assignment at the top
level of a module, class, or __init__
method are called “attribute
docstrings”.

So the following are considered documented attributes:

class Foo(object):
  velocity = 1  
  """Foo's initial velocity - class variable"""

  def __init__(self, args):
    self.location = 0.0 
    """Foo's initial location - instance variable"""   

(Edit: Fixed second docstring)