Tuple Comprehension ???

[Michael Torrie]

On 2/20/23 20:36, Hen Hanna wrote:
> For a while,  i've been curious about a  [Tuple   Comprehension] 

I've never heard of a "Tuple comprehension."  No such thing exists as
far as I know.

> So  finally   i tried it, and the result was a bit surprising...
> 
> 
> X= [ x for x in range(10) ]
> X= ( x for x in range(10) )
> print(X)
> a= list(X)
> print(a)

What was surprising? Don't keep us in suspense!

Using square brackets is a list comprehension. Using parenthesis creates
a generator expression. It is not a tuple. A generator expression can be
perhaps thought of as a lazy list.  Instead of computing each member
ahead of time, it returns a generator object which, when iterated over,
produces the members one at a time.  This can be a tremendous
optimization in terms of resource usage.  See
https://docs.python.org/3/reference/expressions.html#generator-expressions.
 Also you can search google for "generator expression" for other examples.