Q:Pythonic way to create list of lists
Tim Chase
python.list at tim.thechases.com
Sat Apr 11 16:25:36 EDT 2009
> I am trying to create a list of empty lists: [[], [], [], ...] (10
> items total).
>
> What is the most Pythonic way to do this?
>
> If I use a list comprehension (as in myList = [[] for item in xrange
> (0, 10)]), Netbeans warns me that 'item' is never used.
Not using Netbeans, I can't verify that the below will stop the
warning. However the variable name "_" is used conventionally to
mean "this doesn't matter". Additionally, the starting point for
xrange defaults to 0, so you can omit it. That would translate to
my_list = [[] for _ in xrange(10)]
-tkc
More information about the Python-list
mailing list