On Thu, Sep 7, 2017 at 11:46 AM, Erik Bray <erik.m.b...@gmail.com> wrote: > On Thu, Sep 7, 2017 at 11:06 AM, Jeroen Demeyer <jdeme...@cage.ugent.be> > wrote: >> On 2017-09-06 17:24, Erik Bray wrote: >>> >>> Interpreting >>> "str" as "bytes" is the only way it can be if language_level=2. >> >> >> I think you are misunderstanding. You didn't post the complete C code >> generated by Cython: >> >> __pyx_t_4 = __Pyx_PyBytes_FromString(__pyx_v_s); if (unlikely(!__pyx_t_4)) >> __PYX_ERR(0, 2076, __pyx_L1_error) >> __Pyx_GOTREF(__pyx_t_4); >> __pyx_t_3 = PyTuple_New(1); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 2076, >> __pyx_L1_error) >> __Pyx_GOTREF(__pyx_t_3); >> __Pyx_GIVEREF(__pyx_t_4); >> PyTuple_SET_ITEM(__pyx_t_3, 0, __pyx_t_4); >> __pyx_t_4 = 0; >> __pyx_t_4 = __Pyx_PyObject_Call(((PyObject *)(&PyString_Type)), __pyx_t_3, >> NULL); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 2076, __pyx_L1_error) >> __Pyx_GOTREF(__pyx_t_4); >> __Pyx_DECREF(__pyx_t_3); __pyx_t_3 = 0; >> __pyx_v_k = __pyx_t_4; >> __pyx_t_4 = 0; >> >> So, what this does is to interpret a char* as bytes, because a char* really >> is just bytes. And then it calls str() on the result. So you get str(b"1"). >> >> I don't think that this has anything to do with the language_level. > > Ah, you're right, I didn't see that I just saw the PyBytes_FromString. > So it least "str" is really treated as "str" on Python 3. That's less > terribly confusing than I thought. I'd still like to play around with > language_level=3 more though. It still makes for a more consistent > porting experience (e.g. string literals are unicode on Python 3).
Well, as was pointed out in #23089, this is definitely a non-starter in the short term due to https://github.com/cython/cython/issues/1159 . But I really think it's still the most sane approach in principle. I'm going to work on that Cython issue--I agree it looks very tricky but I don't think it's beyond solving and it really should be fixed... -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
