python - 如何从 for...in... 循环中排除列表中的 1 项

Question

我正在编写一个函数来感染和治愈一个城市，但我总是希望 city[0] 保持感染状态。所有城市都是列表的一部分。

def sim_step(cities , p_spread , p_cure):
    for city in cities:
        if city[1] == True and numpy.random.rand() < p_spread:
            zombify(my_world , cities[numpy.random.randint(city[3])])
        if city[1] == False and numpy.random.rand() < p_cure:
            cure(my_world , cities[numpy.random.randint(city[3])])

Answer 1

你可以这样做:

def sim_step(cities , p_spread , p_cure):
    for city in cities[1:]:
        if city[1] == True and numpy.random.rand() < p_spread:
            zombify(my_world , cities[numpy.random.randint(city[3])])
        if city[1] == False and numpy.random.rand() < p_cure:
            cure(my_world , cities[numpy.random.randint(city[3])])

区别在于:cities[1:]。这称为切片操作。要了解更多信息，请阅读 this answer .