On Thu, 12 Mar 2020 at 18:42, Andrew Barnert via Python-ideas <python-ideas@python.org> wrote:
What if a for loop, instead of nexting the iterator and binding the result to the loop variable, instead unbound the loop variable, nexted the Iterator, and bound the result to the loop variable?
I missed that. But I do not understand how this can speed up any loop. I mean, if Python do this, it does an additional operation at every loop cycle, the unbounding. How can it be faster? Furthermore, maybe I can be wrong, but reassigning to a variable another object does not automatically unbound the variable from the previous object? For what I know, Python is a "pass by value", where the value is a pointer, like Java. Indeed any python variable is a PyObject*, a pointer to a PyObject. When you assign a new object to a variable, what are you really doing is change the value of the variable from a pointer to another. So the variable now points to a new memory location, and the old object has no more references other then itself. Am I right?