python - Splitting lists within a 2d list -

say have 2d list called sentences.

sentences = [['hello'],['my'],['name']].   

is there anyway split these lists every character separate indexes, like:

sentences = [['h','e','l','l','o'],['m','y'],['n','a','m','e'] 

for example: sentences.txt =

hello name  

the code i've written:

sentence = open('sentences.txt', 'r') sentence_list = [] new_sentence_list = [] line in sentence:     line = line.rstrip('\n')     sentence_list.append(line) line in sentence_list:     line = [line]     new_sentence_list.append(line) 

this result in new_sentence_list be:

[['hello'],['my'], ['name']].   

when be:

[['h','e','l','l','o'],['m','y'],['n','a','m','e'] 

you need use list(line) achieve this:

so, code becomes below, original line commented.

sentence = open('sentences.txt', 'r') sentence_list = [] new_sentence_list = [] line in sentence:     line = line.rstrip('\n')     sentence_list.append(line) line in sentence_list:     line = list(line)     # line = [line]     new_sentence_list.append(line)