New submission from mpb: I'm writing Python code to parse binary (byte oriented) data.
I am (at least somewhat) aware of the performance implications of various approaches to doing the parsing. With performance in mind, I would like to avoid unnecessary creation/destruction/copying of memory/objects. An example: Let's say I am parsing b'0123456789'. I want to extract and return the substring b'234'. Now let's say I do this with memoryviews, to avoid unnecessary creation and copying of memory. m0 = memoryview (b'0123456789') m1 = m0[2:5] # m1 == b'234' Let's say I do this 1000 times. Each time I use readinto to load the next data into m0. So I can create m0 only once and reuse it. But if the relative position of m1 inside m0 changes with each parse, then I need to create a new m1 for each parse. In the context of the above example, I think it might be nice if I could rebind an existing memoryview to a new object. For example: m0 = memoryview (b'0123456789') m1.bind (m0, 2, 5) # m1 == b'234' Is this an idea worth considering? (Possibly related: Issue 9789, 9757, 3506; PEP 3118) ---------- messages: 202806 nosy: mpb priority: normal severity: normal status: open title: memoryview bind (the opposite of release) type: enhancement versions: Python 3.5 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue19577> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
