List Comprehension To Merge Various Lists In Python

I need to plot a lot of data samples, each stored in a list of integers. I want to create a list from a lot of concatenated lists, in order to plot it with enumerate(big_list) in o

Solution 1:

import itertools
for x,y in enumerate(itertools.chain(*(recordings[n][chosen_channel] for n in xrange(number_of_lists))):
    print x,y

You can think of itertools.chain() as managing an iterator over the individual lists. It remembers which list and where in the list you are. This saves you all memory you would need to create the big list.

Solution 2:

>>> import itertools
>>> l1 = [2,3,4,5]
>>> l2=[9,8,7]
>>> itertools.chain(l1,l2)
<itertools.chain object at 0x100429f90>
>>> list(itertools.chain(l1,l2))
[2, 3, 4, 5, 9, 8, 7]