Default method arguments

[Duncan Booth]

Nicola Larosa wrote:

>> Using None might be problematic if None could be a valid argument.
> 
> That's like saying that NULL could be a significant value in SQL. In
> Python, "None" *is* the empty, not significant value, and should
> always be used as such. Specifically, never exchange "None" for
> "False". 
> 
You don't think there is a difference in SQL between a field explicitly set 
to NULL or a field initialised with a default value?

What you should be saying here is never use "None" when you actually mean 
"use the default non-None value for this parameter".