On Mon, Jan 30, 2012 at 8:05 AM, William Stein <wst...@gmail.com> wrote: > > On Jan 30, 2012 5:12 AM, "Nathann Cohen" <nathann.co...@gmail.com> wrote: >> >> Hello everybody !!! >> >> I wondered why we still had .py files in our library. Some time ago >> this made sense as there were Python features that were not available >> in Cython -- like the yield keyword -- but now that they are, what is >> the point ? I'm asking this because we have in the Graph classes which >> are "copies" of each other, that is for instance a file >> generic_graph.py and a generic_graph_pyx.pyx, whose purpose is obvious >> : we want to be able to define some methods as Python ones, some >> others as Cython ones.
If classes or modules are artificially split due to (former, I hope) limitations in Cython should be merged, but there's no reason to switch from pure Python to Cython unless there's a compelling reason to do so. Cython compliments Python, it's not a replacement. >> Well, what is the point of having .py files anymore when we could >> easily rename them to .pyx without changing anything in them (first -- >> is that even true or am I a bit optimistic ?) and be able to add some >> Cython code inside when Python is so awfully slow ? > > If you ever change a filebfrom Python to Cython for no clear good reason, I > will be very annoyed. One should always use Python instead of Cython unless > there is a clear compelling reason not to. > > Cython code... > > - takes a long time to compile > - is much harder to interactively debug sunce you can't run python code in > the stackframe's context (yet) > - requires more knowledge for devs to use thus reducing the maintainability > of sage > - is not always faster than pure python > - does not support 100% of Python language features > - > >> Cython is good, Cython is beautiful, Cython is fast. Thanks to Cython >> I can finally write Sage code which fails on weird architectures and >> spend days fixing the bugs, which is way harder with plain Python. >> >> Thankssss for your thoughts ! :-) >> >> Nathann >> >> -- >> To post to this group, send an email to sage-devel@googlegroups.com >> To unsubscribe from this group, send an email to >> sage-devel+unsubscr...@googlegroups.com >> For more options, visit this group at >> http://groups.google.com/group/sage-devel >> URL: http://www.sagemath.org > > -- > To post to this group, send an email to sage-devel@googlegroups.com > To unsubscribe from this group, send an email to > sage-devel+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/sage-devel > URL: http://www.sagemath.org -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
