What way is the best to check an empty list?

[John Machin]

On Mar 26, 1:38 am, srinivasan srinivas <sri_anna... at yahoo.co.in>
wrote:

Depends on what you mean by "best"; like graduation day at
kindergarten, everyone gets a prize:

> For ex: to check list 'A' is empty or not..
> if A == []:

most obviously correct

> if A.count == 0:

best use of imagination

> if len(A) == 0:

best use of a built-in function

> if not A:

most Pythonic, most laconic, fastest