python：元组列表中的元组链元素

Question

I want to find combinations of elements in a string. baseString is of variable length eg 'tbyhn' or 'tg' or so on.

I tried:

import itertools

baseString = 'tgby'
prd = [it for it in itertools.product(base,repeat=len(baseString)-1)]

prd is a list that looks like this:

[('t', 't', 't'), ('t', 't', 'g'), ('t', 't', 'b'), ..., ('y', 'y', 'y')]

I would like the list to look like this:

['ttt','ttg','ttb','tty','tgt',...,'yyy']

How can I do that?

Also, if I ever have a list of tuples like 'prd' how do I chain only the elements that are in each tuple.

EDIT

I didn't want these types of outcomes:

   x = ['t','t','t','t','t','g','t','t','b','t','t','y',...,'y','y','y']

   x = ['tttttgttbttytgt...yyy']

Answer 1

Simply join them like this

bS = 'tgby'
prd = ["".join(it) for it in itertools.product(bS, repeat=len(bS)-1)]

Edit: A faster version, suggested by @alko in the comments

prd = map(''.join, itertools.product(bS, repeat=len(bS)-1))