遍历嵌套列表，元组和字典

问题描述

我对迭代嵌套列表和字典的主题还有一个疑问 a>.

I've another question to the thematic of Iterate over nested lists and dictionaries.

我需要一些有关上面链接主题的扩展功能.可迭代元素现在还包含元组.同样，元组中的整数也需要转换为十六进制字符串.因此，我尝试使用以下代码将元组转换为列表.

I need some extended functionality to the topic of the link above. The iterable element now also contains tuples. Also integers in tuples need to be converted to a hex string. Therefor I tried with following code, to convert the tuples to lists.

for path, value in objwalk(element):
    if isinstance(value, tuple):
        parent = element
        for step in path[:-1]:
            parent = parent[step]
        parent[path[-1]] = list(value)

但是我的问题是，元组中的元组没有被转换.如何以一种优雅的方式将子元组"转换为列表?

But my problem is, that tuples in tuples are not converted. How can I convert "sub-tuples" to lists in an elegant way?

最诚挚的问候威瓦

PS:我创建了一个新主题，因为另一个主题对我来说是固定的.

PS: I created a new topic, because the other-one is fixed for me.

推荐答案

在这种情况下，直接在objwalk结构遍历器中处理元组会更容易.这是一个修改后的版本，可在将元组遍历以查找嵌套元素之前将其转换为列表:

In this case, it would be easier to handle tuples directly in the objwalk structure traverser. Here is a modified version that converts tuples to lists before traversing over them to find nested elements:

def objwalk(obj, path=(), memo=None):
    if memo is None:
        memo = set()
    iterator = None
    if isinstance(obj, dict):
        iterator = iteritems
    elif isinstance(obj, (list, set)) and not isinstance(obj, string_types):
        iterator = enumerate
    if iterator:
        if id(obj) not in memo:
            memo.add(id(obj))
            for path_component, value in iterator(obj):
                if isinstance(value, tuple):
                    obj[path_component] = value = list(value)
                for result in objwalk(value, path + (path_component,), memo):
                    yield result
            memo.remove(id(obj))
    else:
        yield path, obj

使用上一个问题中经过稍微修改的示例，以及我在该问题中为您提供的相同的hex解决方案:

Using a slightly modified example from your previous question, and the same hex solution I gave you in that question:

>>> element = {'Request': (16, 2), 'Params': ('Typetext', [16, 2], 2), 'Service': 'Servicetext', 'Responses': ({'State': 'Positive', 'PDU': [80, 2, 0]}, {})}
>>> for path, value in objwalk(element):
...     if isinstance(value, int):
...         parent = element
...         for step in path[:-1]:
...             parent = parent[step]
...         parent[path[-1]] = hex(value)
...
>>> element
{'Params': ['Typetext', ['0x10', '0x2'], '0x2'], 'Request': ['0x10', '0x2'], 'Responses': [{'State': 'Positive', 'PDU': ['0x50', '0x2', '0x0']}, {}], 'Service': 'Servicetext'}

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