What is "lambda x=x : ... " ?

[Fredrik Lundh]

Mike Meyer wrote:

>> What does "y=y" and "c=c" mean in the lambda function?
> 
> Older versions of python didn't make variables in an outer scope
> visible in the inner scope. This was the standard idiom to work
> around that.

lexically scoped free variables and object binding are two different 
things, and have different semantics.  the former does not always 
replace the latter.

</F>