Something is rotten in Denmark...

[Ian Kelly]

On Tue, May 31, 2011 at 2:18 PM, harrismh777 <harrismh777 at charter.net> wrote:
> If I'm understanding that correctly, then that means lambda is working as
> designed, and that there are very subtle nuances to be aware of. In my
> little case
>
>   (lambda n: i + n)
>
>   ... if the  i  goes out of scope before the anonymous function gets called
> then we have a problem... or if  i   as a reference is mutable or refers to
> a different object before the anonymous function is called then we have a
> problem?

Actually, if i merely goes out of scope, there is no problem.  It just
creates a closure.  It's only when the i within that scope is modified
that we run into problems.

In fact, in Python 3 the scope of a list comprehension variable is the
list comprehension itself, so in your original post i was already out
of scope by the time you started calling the lambda functions.

Cheers,
Ian