如何从Python列表中删除一个实例？

Question

So I have a Python script that reads in a .csv file of a play-by-play of a basketball game to calculate a plus/minus by lineup. It keeps track of the current players on the floor in a list of the player's last names, and I encounter an error when a team has two players with the same last name (the play-by-play data doesn't use first names, only numbers and last names, and I don't keep track of their numbers). The problem comes when I use lineup.remove(player) on one of the duplicate names, it removes both from the list. Is there an easy way to only remove one, and if so, can I specify which?

Example list would be

['JONES', 'PATTERSON', 'SMITH', 'JONES', 'WILLIAMS']

Answer 1

From the docs:

list.remove(x) Remove the first item from the list whose value is x. It is an error if there is no such item.

lineup = ['JONES', 'PATTERSON', 'SMITH', 'JONES', 'WILLIAMS']
lineup.remove('JONES') #should just remove the first occurrence of JONES

Answer 2

list = ['JONES', 'PATTERSON', 'SMITH', 'JONES', 'WILLIAMS']
cleared_list = dict((x, 1) for x in list).keys()

This list doesn't keep the order, however.

This one keeps the order but it's slightly more complex:

list = ['JONES', 'PATTERSON', 'SMITH', 'JONES', 'WILLIAMS']

from itertools import count
seq = count()
d = {}
for x in list:
    d.setdefault(x, seq.next())
l = d.items();
l.sort(lambda x, y: cmp(x[1], y[1]))
cleared_list = [x[0] for x in l]