On Monday, December 31, 2012 4:51:16 PM UTC+1, Jean-Pierre Flori wrote: > > > > On Monday, December 31, 2012 4:29:18 PM UTC+1, Nils Bruin wrote: >> >> On Dec 31, 12:58 am, Jean-Pierre Flori <jpfl...@gmail.com> wrote: >> > But then I had a look at the C code Cython generated and thought it >> was >> > the same... >> > So we should look back at the C code, or ask a Python/Cython guru. >> >> The __delitem__ compiles as an ordinary method lookup and call, >> whereas the "del A[..]" compiles as a straight call to PyDict_DelItem >> (or whatever the name of the appropriate routine is). The preparation >> of the parameter to either call seems to be the same. I agree it's >> hard to argue that there's a fundamental difference between the two. >> The "del ..." definitely seems preferable since it saves a method >> lookup. >> > Yup and it's not yet clear to me how __delitem__ is resolved. > In particular, in the dict objects definition, you have a nice > correspondence set up for __getitem__ but nothing for __delitem__ (see > mapp_methods in dictobjects.c), so this might in fact do complicated > things. > >> >> After a first (not so) quick look, I think it might be the generic PyObject_DelItem which gets called in place of the PyDict_DelItem, not sure though, I wasn't patient enough to run this under gdb to get confirmation.
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