How to convert elements in a list of list to lowercase?

Question

I am trying to convert the elements of a list of list of lowercase. This is what is looks like.

print(dataset)
[[\'It\', \'went\', \'Through\', \'my\', \'shi         


        

Answer 1

Either use map

map(str.lower,line)

Or list comprehension (which is basically syntactic sugar)

[x.lower() for x in line]

And this process can be nested for the entire dataset

[[x.lower() for x in line] for line in dataset]

And if you want to join all lines into one, use reduce:

reduce(list.__add__,[[x.lower() for x in line] for line in dataset])