[issue3489] add rotate{left,right} methods to bytearray

Antoine Pitrou added the comment: I think we can close. issue17100 would have been more useful actually. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue3489 ___

[issue3489] add rotate{left,right} methods to bytearray

Serhiy Storchaka added the comment: I think you rather need the inplace shift operation. Or even the move the tail of buffer to the start without filling the remaining. I.e. something like buffer[:size] = buffer[-size:] but without creating immediate bytes object. Now it may be written

[issue3489] add rotate{left,right} methods to bytearray

Changes by Terry J. Reedy tjre...@udel.edu: -- resolution: - rejected status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue3489 ___

[issue3489] add rotate{left,right} methods to bytearray

Ethan Furman added the comment: Antoine, do you want to pursue, or can we close this? -- nosy: +ethan.furman ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue3489 ___

[issue3489] add rotate{left,right} methods to bytearray

Changes by Raymond Hettinger rhettin...@users.sourceforge.net: -- priority: normal - low stage: unit test needed - ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue3489 ___

[issue3489] add rotate{left,right} methods to bytearray

Terry J. Reedy tjre...@udel.edu added the comment: Antoine, do you disagree with Raymond or should we close this? In any case, I believe this would delayed by the moratorium. -- nosy: +terry.reedy versions: +Python 3.3 -Python 2.7, Python 3.2 ___

[issue3489] add rotate{left,right} methods to bytearray

Changes by Daniel Diniz aja...@gmail.com: -- stage: - test needed versions: +Python 3.2 -Python 3.1 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue3489 ___

[issue3489] add rotate{left,right} methods to bytearray

Raymond Hettinger rhettin...@users.sourceforge.net added the comment: Am -1 on this. Rotating byte arrays has very few use cases and the ones it does have can typically be met by indexing. -- nosy: +rhettinger ___ Python tracker

[issue3489] add rotate{left,right} methods to bytearray

Josiah Carlson [EMAIL PROTECTED] added the comment: Sadly, this isn't quite as easy as it would seem. The O(1) memory overhead version of this requires 2n reads and 2n writes, but does both reads and writes at two memory locations at a time, which may have nontrivial performance implications.

[issue3489] add rotate{left,right} methods to bytearray

Antoine Pitrou [EMAIL PROTECTED] added the comment: Hi, Sadly, this isn't quite as easy as it would seem. You are right, I was overly optimist when thinking about this. Offering this ability in the momoryview object would be very interesting, though I'm not sure that the memoryview object

[issue3489] add rotate{left,right} methods to bytearray

Josiah Carlson [EMAIL PROTECTED] added the comment: In order for MemoryView to know what bytes it is pointing to in memory, it (generally) keeps a pointer with a length. In order to rotate the data without any copies, you need a pointer and length for each rotation plus the original. For

[issue3489] add rotate{left,right} methods to bytearray

Antoine Pitrou [EMAIL PROTECTED] added the comment: Le vendredi 08 août 2008 à 21:44 +, Josiah Carlson a écrit : Josiah Carlson [EMAIL PROTECTED] added the comment: In order for MemoryView to know what bytes it is pointing to in memory, it (generally) keeps a pointer with a length. In

[issue3489] add rotate{left,right} methods to bytearray

New submission from Antoine Pitrou [EMAIL PROTECTED]: While tweaking the BufferedWriter implementation it came to me that it would be useful to have rotate_left and rotate_right methods on bytearray, so as to rotate the array by a number of bytes without any wasteful memory allocations and