将列表中的每个元素转换为相应的（预定义的）字典值

Question

The coding challenge from Codewars

I want to map each corresponding value in an array to my new defined dictionary such that

'NORTH': 1, 'SOUTH': -1, 'EAST': 1, 'WEST': -1

Here, each key corresponds to a an individual element in a given list and the values in the dict is what I want the new elements of said list to equal to.

I then intend on taking the sum of the new list to find the "reduced direction"

Any help would be appreciated. Thank you!

Answer 1

You can use map .

>>> src = ['NORTH','SOUTH','EAST','EAST']
>>> adict = {'NORTH': 1, 'SOUTH': -1, 'EAST': 1, 'WEST': -1}
>>> sum(map(adict.__getitem__,src))
2
>>>