On 26-3-2015 0:14, kai.pet...@gmail.com wrote: > On Tuesday, 24 March 2015 20:14:06 UTC-7, otaksoft...@gmail.com wrote: >> I have a list containing 9600 integer elements - each integer is either 0 or >> 1. >> >> Starting at the front of the list, I need to combine 8 list elements into 1 >> by treating them as if they were bits of one byte with 1 and 0 denoting bit >> on/off (the 8th element would be the rightmost bit of the first byte). >> >> The end result should be a new list that is 8 x shorter than the original >> list containing integers between 0 and 255. >> >> Speed is not of utmost importance - an elegant solution is. Any suggestions? >> >> Thanks for all input, >> Kai > > > > The list comes from PILLOW: > > getdata # > > im.getdata() => sequence >
Don't you want to use Image.tobytes() instead? Or, Image.save() directly if you want to store the image somewhere else perhaps? In other words, what are you going to do with the -internal- data returned from getdata, perhaps you don't even want to call it, and skip dealing with the raw pixel bits altogether... Irmen -- https://mail.python.org/mailman/listinfo/python-list
