python中如果通过索引遍历列表
python中我们可以通过for循环来遍历列表:
colours = ["red","green","blue"]
 
for colour in colours:
    print colour
如果希望遍历列表的同时得到元素的索引号,可以使用下面的代码:
colours = ["red","green","blue"]
 
for i, colour in enumerate(colours):
    print i, colour




