pythonlistempty-list

How can I make multiple empty lists in Python?

How can I make many empty lists without manually typing the following?

list1=[], list2=[], list3=[]

Is there a for loop that will make me 'n' number of such empty lists?

Solution

  • A list comprehension is easiest here:

    >>> n = 5
>>> lists = [[] for _ in range(n)]
>>> lists
[[], [], [], [], []]

    Be wary not to fall into the trap that is:

    >>> lists = [[]] * 5
>>> lists
[[], [], [], [], []]
>>> lists[0].append(1)
>>> lists
[[1], [1], [1], [1], [1]]