Steven D'Aprano <st...@pearwood.info> writes: > On Mon, 14 Sep 2015 01:23 pm, Akira Li wrote: > >> Steven D'Aprano <st...@pearwood.info> writes: >> >>> On Mon, 14 Sep 2015 11:22 am, Akira Li wrote: >>>> Look at the last example: >>>> http://thread.gmane.org/gmane.comp.python.general/782626/focus=782704 >>> >>> >>> I'm afraid that page is broken in my browser. Can you not summarise, or >>> link to the specific message? I may be able to use another browser in a >>> day or two, but hopefully the discussion will have moved on by then. >> >> https://mail.python.org/pipermail/python-list/2015-September/696631.html > > Thanks. You mean this example? > > lst = [range(1, 3) for _ in range(3)] > a = [lst[0], lst[0]] > b = [lst[1], lst[2]] > > > I don't see what's difficult about this example. Here's a simple ASCII > drawing: > > > lst --------> [ range-object-1 , range-object-2 , range-object-3 ] > > a ----------> [ range-object-1 , range-object-1 ] > > b ----------> [ range-object-2 , range-object-3 ] >
I should have mentioned that lst plays the role of range-object-X in your diagram i.e., only *a*, *b* names actualy exits (I should add `del lst` to the example) -- as the original example requires. > Trying to draw an arrow diagram using text is not my idea of a good time, > but I'll give it a go. Requires a monospaced font and an email client that > won't reflow the text: > > +-----+------+ > | | | <--------------------------- a > +--|--+---|--+ > | | > | | > V | > +-----+ <-+ +----+ > |range| <---------------|- |<------------ lst > +-----+ +----+ > +-----------|- | > +-----+ | +----+ > +-> |range| <---+ +------|- | > | +-----+ | +----+ > | | > | +-----+ | > | |range| <--------+ > | +-----+ > | ^ > +-|-+ | > | | | > +---+ | > | -|----+ > +---+ > ^ > | > +------------------------------------------- b > > > Out of the two, I know which one I prefer. I don't know what it means. If you mean "box and arrows" is superior somehow then I don't see any difference from the "parcel tags" model here. My point is that neither models are detailed enough to describe meaningfully the behavior of Python code in the general case. -- https://mail.python.org/mailman/listinfo/python-list
