循环列表并基于索引创建字典

Question

我想创建一个字典来获得如下输出：

代码：

d = {}
a = [[["man", "eater", "king"], ["king", "kong", "yes"]]]

for i, x in enumerate(a):
    for ii, xx in enumerate(x):
#this part i hope to check both the i and ii combination already inside the dictionary or not
#Example like if i or ii in d: # maybe something relevant
        d[i] = {ii:xx}
print(d)

电流输出：

{0: {1: ['king', 'kong', 'yes']}}

预期产量：

{{0: {0: ['man', 'eater', 'king']}},{0: {1: ['king', 'kong', 'yes']}}}

Answer 1

我想你的意思是：

d = {i: {j: s for j, s in enumerate(l)} for i, l in enumerate(a)}

或使用嵌套的for循环：

d = {}
for i, l in enumerate(a):
    t = {}
    for j, s in enumerate(l):
        t[j] = s
    d[i] = t

d变成：

{0: {0: ['man', 'eater', 'king'], 1: ['king', 'kong', 'yes']}}

请注意，您的预期输出是不正确的，因为它是一组dict，这是不可能发生的，因为dict是不可损坏的

Answer 2

使用collections.defaultdict

例如：

from collections import defaultdict

d = defaultdict(dict)
a = [[["man", "eater", "king"], ["king", "kong", "yes"]]]

for i, x in enumerate(a):
    for ii, xx in enumerate(x):
        d[i][ii] = xx
print(d)

---

或者

d = {}
a = [[["man", "eater", "king"], ["king", "kong", "yes"]]]

for i, x in enumerate(a):
    d[i] = {}
    for ii, xx in enumerate(x):
        d[i][ii] = xx
print(d)

---

或者

for i, x in enumerate(a):
    for ii, xx in enumerate(x):
        d.setdefault(i, {})[ii] = xx
print(d)

输出：

defaultdict(<type 'dict'>, {0: {0: ['man', 'eater', 'king'], 1: ['king', 'kong', 'yes']}})