Break Python List Into Multiple Lists, Shuffle Each Lists Separately

Let's say I have posts in ordered list according to their date. [, , , , , ] I want to br

Solution 1:

Sure. random.shuffle works in-place so looping through list elements and applying it on them does the first job. For the "flattening" I use a favorite trick of mine: applying sum on sublists with start element as empty list.

import random,itertools

chunks = [["Post: 6", "Post: 5"], ["Post: 4", "Post: 3"], ["Post: 2", "Post: 1"]]

# shuffle

for c in chunks: random.shuffle(c)

# there you already have your list of lists with shuffled sub-lists
# now the flattening

print(sum(chunks,[]))                  # or (more complex but faster below)
print(list(itertools.chain(*chunks)))  # faster than sum on big lists

Some results:

['Post: 5', 'Post: 6', 'Post: 4', 'Post: 3', 'Post: 2', 'Post: 1']
['Post: 6', 'Post: 5', 'Post: 3', 'Post: 4', 'Post: 1', 'Post: 2']

(you said you wanted something like [[<Post: 5>, <Post: 6>, <Post: 4>, <Post: 3>, <Post: 1>, <Post: 2>]] (list in a list) but I suppose that's a typo: I provide a simple, flattened list.