STINNER Victor <victor.stin...@haypocalc.com> added the comment: > Why does it have a 'seek' method then?
Python doesn't remove a method if the operation is forbidden. For example, Python doesn't remove write() method if the file is read only, and it doesn't remove most methods after close(). I prefer to have files with always the same API. I think that it's more practical. Note: Text files of the io module (TextIOWrapper) raises io.UnsupportedOperation on seek() if the file is not seekable (e.g. if the file is a pipe): $ ~/prog/python/default/python Python 3.3.0a0 (default:d26c7b18fc9d, Jul 22 2011, 12:04:31) >>> import os >>> a,b=os.pipe() >>> f=os.fdopen(a, 'rb') >>> f <_io.BufferedReader name=3> >>> f.seek(0) Traceback (most recent call last): File "<stdin>", line 1, in <module> IOError: [Errno 29] Illegal seek >>> f2=os.fdopen(a, 'r') >>> f2 <_io.TextIOWrapper name=3 mode='r' encoding='UTF-8'> >>> f2.seek(0) Traceback (most recent call last): File "<stdin>", line 1, in <module> io.UnsupportedOperation: underlying stream is not seekable ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue12877> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
