Cezary Wagner <cezary.wag...@gmail.com> added the comment:
I tested is and it is not "state cookie" but it is "absolute position" and it is "stateless". > The I/O stack in Python 3 does not use C FILE streams, and this issue is not > related to Windows. TextIOWrapper.tell returns a "cookie" based on the > decoder state: I will study: https://github.com/python/cpython/blob/3.8/Modules/_io/textio.c#L2589 - Thank you for reference. See this test code (wrong seek is good - decoder has not state before - first line of program). You can swap this two fragments and it still works. print('seek 18446744073709554618') with open('../s01_parser_eval/data/out-6976.txt') as pgn: pgn.seek(18446744073709554618) while pgn.tell() != 3003: pgn.readline() print(pgn.tell()) print() print('seek 0') with open('../s01_parser_eval/data/out-6976.txt') as pgn: pgn.seek(0) while pgn.tell() != 18446744073709554618: pgn.readline() print(pgn.tell()) pgn.readline() print('next', pgn.tell()) print('seek 18446744073709554618') with open('../s01_parser_eval/data/out-6976.txt') as pgn: pgn.seek(18446744073709554618) while pgn.tell() != 3003: pgn.readline() print(pgn.tell())) ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue39962> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
