On 3月23日, 上午3时18分, John Machin <sjmac...@lexicon.net> wrote: > On Mar 23, 5:44 pm, valpa <valpass...@gmail.com> wrote: > > > I have a python float 1.2345678. I know that it is stored as a double > > in C type. And I know it actually is 1010101010101 -like format. Then > > I want to do some bit operation on it. How? > > > Sure, I want a float output when I finish the operation. > > import struct > pack it into a str [Python 2.X] using d format > unpack it using Q format, gets you a 64-bit unsigned int > do "some bit operation" using & | ^ ~ << >> operators > pack it into a str using Q format > unpack it into a float using d format > > What is "some bit operation"? Perhaps there is already a high-level > way of doing some of what you want e.g. in the math module: frexp, > ldexp, isnan, isinf, ... > > HTH > John
Thanks John! Yes, I want to do a & operation. The pack way is to convert float to/from string, Is it efficient? valpa -- http://mail.python.org/mailman/listinfo/python-list
