On 6 Oct 2006 16:57:23 -0700, erikcw <[EMAIL PROTECTED]> wrote: > I ended up using len(sys.argv) > 1 for this particular problem. But I > think slicing is closer to the tool I was looking for. > > I found a.has_key(k) or "k in a" for dictionaries - but haven't found > anything similar for lists. Does it exist?
As Gabriel Genellina observed, lists also may use the 'in' syntax. Actually, any object that supports the method __contains__ can do this, which means you may furnish your own in user objects. What hasn't been addressed is efficiency. This is often a secondary concern in a VHLL such as Python, but you may wish to know that using the 'in' test on a large list repeatedly will slow down a program. You may wish to use a set object instead, according to the application. > I guess my example from php would technically be a dictionary in python > and not a list, it would nice to be able to quickly tell if a list key > existed or not. Yes, PHP arrays are associative (dicts). But lists (in the Pythonic sense, aka 'vectors') do not have keys as such, only indices. -- Theerasak -- http://mail.python.org/mailman/listinfo/python-list
