How to iterate through a list of lists in python?

Question

I have a list of lists like this.

documents = [[\'Human machine interface for lab abc computer applications\',\'4\'],
             [\'A survey of user opinio         


        

Answer 1

The simplest solution for doing exactly what you specified is:

documents = [sub_list[0] for sub_list in documents]

This is basically equivalent to the iterative version:

temp = []
for sub_list in documents:
    temp.append(sub_list[0])
documents = temp

This is however not really a general way of iterating through a multidimensional list with an arbitrary number of dimensions, since nested list comprehensions / nested for loops can get ugly; however you should be safe doing it for 2 or 3-d lists.

If you do decide to you need to flatten more than 3 dimensions, I'd recommend implementing a recursive traversal function which flattens all non-flat layers.