def flip_keys(to_flip):
"""To reverse items in a mixed list
Args:
to_flip(list): a list mixed with tuple and other values.
Returns:
list: to return values in the list, reversed.
Examples:
>>> flip_keys([(1, 2, 3), 'abc'])
'[(3, 2, 1), 'cba']
"""
counter = 0
for value in to_flip:
to_flip[counter] = value[::-1]
counter += 1
return to_flip
这是一个python函数,它是向后翻转输入的每个元素。我学会了索引,但to_flip [counter]就像我看到的一样。在翻转每个元素时,to_flip [counter]的用途是什么?它有名字吗?并没有反作用来添加给出的每个数字,并得出一笔金额?为什么需要这里?对于初学者来说,有没有其他方法可以像这样做反向。谢谢。
答案 0 :(得分:1)
to_flip
行正在翻转该元素中的任何内容。例如,如果您只在一个列表上运行它:
my_list = [1,2,3,4,5]
flipped_list = my_list[::-1]
flipped_list
现在为[5,4,3,2,1]
。 [::-1]
是翻转任何列表的简洁简写。
对于您的代码,counter
会跟踪to_flip
中您所在的元素。您也可以使用enumerate
跟踪列表中的for i, value in enumerate(to_flip):
to_flip[i] = value[::-1]
,它也会计算您所在的元素:
Direction // x and y tuple/variable, integer, or string
Point // x and y tuple/variable. Note that you can use this as direction too
Vertex
- Point
- Map < Direction, Edge > // each direction is linked to another vertex
// maps in C can be made with two arrays
// a vertex for each direction may be easier
Edge
- Vertex // you can store both vertices, but you only need to store the one being moved to.
// without OOP, reuse a simple struct before making it complex
Graph
- Vertices // array of vertex
// each vertex stores its edges; the graph doesn't need to