On Tue, 3 Oct 2017 08:15:04 -0700 Guido van Rossum <gvanros...@gmail.com> wrote: > It's really not that hard. You just check the magic number and if it's the > new one, skip 4 words. No need to understand the internals of the header.
Still, I agree with Barry that an API would be nice. Regards Antoine. > > On Oct 3, 2017 08:06, "Barry Warsaw" <ba...@python.org> wrote: > > > Guido van Rossum wrote: > > > There have been no further comments. PEP 552 is now accepted. > > > > > > Congrats, Benjamin! Go ahead and send your implementation for > > review.Oops. > > > Let me try that again. > > > > While I'm very glad PEP 552 has been accepted, it occurs to me that it > > will now be more difficult to parse the various pyc file formats from > > Python. E.g. I used to be able to just open the pyc in binary mode, > > read all the bytes, and then lop off the first 8 bytes to get to the > > code object. With the addition of the source file size, I now have to > > (maybe, if I have to also read old-style pyc files) lop off the front 12 > > bytes, but okay. > > > > With PEP 552, I have to do a lot more work to just get at the code > > object. How many bytes at the front of the file do I need to skip past? > > What about all the metadata at the front of the pyc, how do I interpret > > that if I want to get at it from Python code? > > > > Should the PEP 552 implementation add an API, probably to > > importlib.util, that would understand all current and future formats? > > Something like this perhaps? > > > > class PycFileSpec: > > magic_number: bytes > > timestamp: Optional[bytes] # maybe an int? datetime? > > source_size: Optional[bytes] > > bit_field: Optional[bytes] > > code_object: bytes > > > > def parse_pyc(path: str) -> PycFileSpec: > > > > Cheers, > > -Barry > > > > _______________________________________________ > > Python-Dev mailing list > > Python-Dev@python.org > > https://mail.python.org/mailman/listinfo/python-dev > > Unsubscribe: https://mail.python.org/mailman/options/python-dev/ > > guido%40python.org > > > _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
