组合和关联多个词典 [英] Combining and associating multiple dictionaries

问题描述

我想生成一个字典，其中组织了三个不同图片组的六个不同组合.那就是为什么我计算字典的原因:

I want to generate a dictionary in which six different combination of three different groups of pictures are organized. Thats why I computed a dictionary:

import glob, os, random, sys, time
import numpy.random as rnd

im_a = glob.glob('./a*')   # upload pictures of the a-type, gives out a List of .jpg-files
im_n = glob.glob('./n*')   # n-type
im_e = glob.glob('./e*')   # e-type

# combining Lists of Pictures
A_n = im_a + im_n
N_a = im_n + im_a
A_e = im_a + im_e
E_a = im_e + im_a
E_n = im_e + im_n
N_e = im_n + im_e

# making a Dictionary of Pictures and Conditions
PicList = [A_n, N_a, A_e, E_a, E_n, N_e]   # just the six Combinations
CondList = [im_a,im_n,im_a,im_e,im_e,im_n] # images that are in the GO-Condition
ImageList = []
ImageList.append({'PicList':PicList, 'CondList':CondList})

这时有两个问题:

1. 首先，有没有更好的方法来合并两个图片列表和第二个
2. 如果我以此方式组织字典，则CondList与PicList不匹配.将PicList直接关联到CondList会很好.其中PicList A_n与CondList im_a和N_a-im_n, A_e-im_a ...
相关联

1. First, is there a better way to combine the two Lists of pictures and second
2. If I organize a dictionary in this way, CondList doesn't match with PicList. It would be nice to associate PicList directly to CondList. Where PicList A_n is associated with CondList im_a and N_a-im_n, A_e-im_a...

推荐答案

要回答第一点，可以使用

To answer the first point, you can use itertools.permutations:

import itertools as it

elements = [im_a, im_n, im_e]
perms = it.permutations(elements, 2)    # 2 -> take pairs
pic_list = [sum(perm, []) for perm in perms]

返回的命令是按字母顺序排列的，即

The order returned is lexicographic, i.e.

im_a + im_n, im_a + im_e, im_n + im_a, im_n + im_e, im_e + im_a, im_e + im_n

只需执行以下操作即可构建相应的cond_list:

The respective cond_list can be built by simply doing:

cond_list = [im_a] * 2 + [im_n] * 2 + [im_e] * 2

或更笼统地说:

d = len(elements) - 1
cond_list = list(chain.from_iterable([el]*d for el in elements))
# or
cond_list = sum(([el]*d for el in elements), [])

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