Question

Update: in python-bitstring 3.0.0 step has the conventional meaning

I am using python bitstring, I have a ConstBitArray loaded from file and I would like to get a slice with a step different from 1.

In a normal list I just would do:

s = mylist[start:stop:step]

however bitstring has a strange definition for stepping, see:

http://packages.python.org/bitstring/slicing.html#stepping-in-slices

does somebody knows how to do that?

thanks

Answer 1

It’s quite clear in the link you provided that they have chosen to make mylist[start:stop:step] syntactic sugar for mylist[start*step:stop*step] which unfortunately means you won’t be able to use the step in the usual way

You could try something list this as a replacement

[mylist[i] for i in range(start,stop,step)]