Q:Pythonic way to create list of lists

[Terry Reedy]

grkuntzmd at gmail.com wrote:
> I am just learning Python.
> 
> 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.

Never heard of netbeans, but a decent code checker should have a 
mechanism to annotate (comment) code to say "I know what I am doing 
here, shut up".

> If I use a for-loop (as in for item in myList = []; for item in xrange
> (0, 10): myList.append([])), Netbeans still warns me of the same
> thing.

Adding something stupic like 'item = item' in the loop might 'work' ;-)


> If I use '*' (as myList = [[]] * 10), all of the empty lists refer to
> the same object; changing one changes them all.

Right.  Typical newbie mistake.  Good for you for discovering that yourself.

> Do I have to live with the warning, or is there a "better" way?

Different checker?  PyChecker? PhLint?

tjr