En Tue, 21 Jul 2009 21:00:13 -0300, Daniel Platz
<mail.to.daniel.pl...@googlemail.com> escribió:
I have an huge binary file from an external program. I want to read
and process the data in this file in a reasonable time. It turns out
that the reading of the data itself and the processing do not need
most of the time. However, when using the read(bytes) method Python
returns a string representing the binary information in hex. This
string I have to "cast/translate" into a number (in my case a signed
short). For this I am using the method struct.unpack from the struct
module. This unpacking part of the program takes by far the most time.
Is there a way to speed this up or to do it the unpacking more
cleverly than with the struct module?
Try creating a Struct object with your format and use its unpack() method.
http://docs.python.org/library/struct.html#struct-objects
If your format consists of just integers, probably an array is more
efficient:
http://docs.python.org/library/array.html#array.array.fromfile
--
Gabriel Genellina
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