Question

Is there a command to merge subsequent elements in a list – ie in a list [‘AA’, ‘BB’, ‘C’, ‘D’] how would one merge the first two elements (or any others, depending on the code) in the list, leaving a list like [‘AABB’, ‘C’, ‘D’] ? Thanks!

Answer 1

You can try the following if you don’t care about init list:

>>> a = ['AA', 'BB', 'C', 'D']
>>> a[0] += a.pop(1)

If you want to get new one and leave initList as is you can use something like this(note that this is just a sample):

a = ['AA', 'BB', 'C', 'D']
outList = a[:] # make a copy of list values
outList[0] += outputList.pop(1)

Or in some cases you can try to use something like this too:

from itertools import groupby

a = ['AA', 'BB', 'C', 'D']
res = [''.join((str(z) for z in y)) for x, y in groupby(a, key = lambda x: len(x) == 2)]