How To Create A List Of Empty Lists

Apologies if this has been answered before, but I couldn't find a similar question on here. I am pretty new to Python and what I am trying to create is as follows: list1 = [] list2

Solution 1:

For arbitrary length lists, you can use [ [] for _ in range(N) ]

Do not use [ [] ] * N, as that will result in the list containing the same list objectN times

Solution 2:

For manually creating a specified number of lists, this would be good:

empty_list = [ [], [], ..... ]

In case, you want to generate a bigger number of lists, then putting it inside a for loop would be good:

empty_lists = [ [] for _ in range(n) ]

Solution 3:

If you want a one-liner you can just do:

result = [[],[]]

Solution 4:

results = [[],[]]

or

results = [list(), list()]

Solution 5:

I would suggest using numpy because you can build higher-dimensional list of lists as well:

import numpy as np
LIST = np.zeros( [2,3] )# OR np.zeros( [2,3,6] )

It works in any number of dimensions.