implementing singleton class at the module level

[Satchidanand Haridas]

Hi,

I was looking at ways to implement a Singleton class. I saw some methods
described on the PythonSingleton wiki
(http://c2.com/cgi/wiki?PythonSingleton). I implemented the following.

<code>

module: A.py
----------------------
class Singleton:
def __init__(self):
#do something
singleton_instance = Singleton()

Then in any other module (eg B.py):

from A import singleton_instance
</code>

singleton_instance will be created only once and can be reused in other
modules. But is this ok? I am trying to figure out what are the
disadvantages of using the above method. I would appreciate any
comments. thanks.

regards,
Satchit

[Michele Simionato]

A Singleton class is there to be inherited from; a singleton instance
like the one you define is pretty much useless (unless I misunderstand
your intentions).

Michele Simionato