On 26.10.2021 18:36, Erik Demaine wrote: > On Tue, 26 Oct 2021, Marc-Andre Lemburg wrote: > >> Now, it may not be obvious, but the key advantage of such >> deferred objects is that you can pass them around, i.e. the >> "defer os.listdir(DEFAULT_DIR)" could also be passed in via >> another function. > > Are deferred code pieces are dynamically scoped, i.e., they are evaluated in > whatever scope they end up getting evaluated? That would certainly > interesting, > but also kind of dangerous (about as dangerous as eval), and I imagine fairly > prone to error if they get passed around a lot.
Yes, they would work more or less like copy & pasting the deferred code into a new context and running it there. Sure, you can abuse this, but the function running the deferred can make sure that it's working in a trusted environment. > If they're *not* dynamically > scoped, then I think they're equivalent to lambda, and then they don't solve > the > default parameter problem, because they'll be evaluated in the function's > enclosing scope instead of the function's scope. Indeed. Lambdas are similar, but not the same. The important part is running the code in a different context. -- Marc-Andre Lemburg eGenix.com Professional Python Services directly from the Experts (#1, Oct 26 2021) >>> Python Projects, Coaching and Support ... https://www.egenix.com/ >>> Python Product Development ... https://consulting.egenix.com/ ________________________________________________________________________ ::: We implement business ideas - efficiently in both time and costs ::: eGenix.com Software, Skills and Services GmbH Pastor-Loeh-Str.48 D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg Registered at Amtsgericht Duesseldorf: HRB 46611 https://www.egenix.com/company/contact/ https://www.malemburg.com/ _______________________________________________ Python-ideas mailing list -- python-ideas@python.org To unsubscribe send an email to python-ideas-le...@python.org https://mail.python.org/mailman3/lists/python-ideas.python.org/ Message archived at https://mail.python.org/archives/list/python-ideas@python.org/message/NUA442RSNDSHKEYNUINRY727XT7OVS63/ Code of Conduct: http://python.org/psf/codeofconduct/
