[英]convert list of keys to nested dictionary
我试图弄清楚如何创建一个像这样的字典: d[keys[0]][keys[1]][keys[2]]
从这样的列表中: keys = ["key1", "key2", "key3"]
...
我尝试了以下方法:
keys = ["key1", "key2", "key3"]
d = {}
d_ref= d
for key_num, key in enumerate(keys):
if key_num < len(keys)-1:
d[key] = {}
d_ref = d[key]
else:
d_ref[key] = []
print(d)
但这导致:
{'key1': {}, 'key2': {'key3': []}}
我的目标是输出:
{'key1' : { 'key2' : { "key3" : [] } } }
感谢wim的回答,使我获得了理想的结果:
keys = ["key1", "key2", "key3"]
d = []
for key in reversed(keys):
d = {key: d}
print(d)
只需简单的for循环即可解决问题
>>> d = {}
>>> for k in reversed(keys):
... d = {k: d}
...
>>> d
{'key1': {'key2': {'key3': {}}}}
( 编辑 : OP在发布后更改了问题 )如果要将列表作为初始值,只需更改第一个任务:
>>> d = []
>>> for k in reversed(keys):
... d = {k: d}
...
>>> d
{'key1': {'key2': {'key3': []}}}
在OP进行编辑后,解决方案现在变成了一种形式:
result = reduce(lambda obj, key: {key: obj}, reversed(keys), [])
# {'key1': {'key2': {'key3': []}}}
或使用一些函数式编程:
from functools import reduce
keys = ["key1", "key2", "key3"]
result = reduce((lambda obj, key: {key: obj}), reversed(keys), dict())
print(result)
# {'key1': {'key2': {'key3': {}}}}
我同意@ Ajax1234的观点,这个问题具有递归的味道,但是我认为可以用比他的解决方案简单得多的代码来完成:
keys = ["key1", "key2", "key3"]
def nest(keys, value):
key, *rest = keys
if rest:
value = nest(rest, value)
return {key: value}
print(nest(keys, []))
您可以使用递归:
def get_dictionary(s, d):
if not s[1:]:
return {s[0]:d}
else:
if not d:
return get_dictionary(s[1:], {s[0]:[]})
else:
return get_dictionary(s[1:], {s[0]:d})
print(get_dictionary(["key1", "key2", "key3"][::-1], {}))
输出:
{'key1': {'key2': {'key3': []}}}
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