获取嵌套字典中所有键的列表

问题描述

我想获得包含列表和字典的嵌套字典中的所有键的列表。

I want to get a list of all keys in a nested dictionary that contains lists and dictionaries.

我目前拥有此代码，但似乎缺少添加列表中的一些键以及副本添加了一些键。

I currently have this code, but it seems to be missing adding some keys to the list and also duplicate adds some keys.

keys_list = []
def get_keys(d_or_l, keys_list):
    if isinstance(d_or_l, dict):
        for k, v in iter(sorted(d_or_l.iteritems())):
            if isinstance(v, list):
                get_keys(v, keys_list)
            elif isinstance(v, dict):
                get_keys(v, keys_list)
            else:
                keys_list.append(k)
    elif isinstance(d_or_l, list):
        for i in d_or_l:
            if isinstance(i, list):
                get_keys(i, keys_list)
            elif isinstance(i, dict):
                get_keys(i, keys_list)
    else:
        print "** Skipping item of type: {}".format(type(d_or_l))
    return keys_list

这只是一个空列表，并用键填充。 d_or_l是一个变量，并使用原始的dict来比较它。

This just takes an empty list and populates it with the keys. d_or_l is a variable and takes the original dict to compare it against.

推荐答案

这应该做的工作：

def get_keys(dl, keys_list):
    if isinstance(dl, dict):
        keys_list += dl.keys()
        map(lambda x: get_keys(x, keys_list), dl.values())
    elif isinstance(dl, list):
        map(lambda x: get_keys(x, keys_list), dl)

为避免重复，您可以使用set，例如：

To avoid duplicates you can use set, e.g.:

keys_list = list( set( keys_list ) )

示例测试用例：

keys_list = []
d = {1: 2, 3: 4, 5: [{7: {9: 1}}]}
get_keys(d, keys_list)
print keys_list
>>>> [1, 3, 5, 7, 9]

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