easy question on parsing python: "is not None"

[Terry Reedy]

On 8/6/2010 5:27 AM, Richard D. Moores wrote:

> So there would be a different implementation for each operating
> system? One for Windows, one for linux? Or one for Vista and one for
> XP?  I'm just trying to clarify what is meant by "implementation".

Different version of CPython (that string caching bit has changed in the 
past) and CPython versus Jython, PyPy, IronPython, Cython, etc.

-- 
Terry Jan Reedy