如何完全遍历未知深度的复杂字典? [英] How to completely traverse a complex dictionary of unknown depth?
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问题描述
从JSON
导入可以得到非常复杂和嵌套的结构.
例如:
Importing from JSON
can get very complex and nested structures.
For example:
{u'body': [{u'declarations': [{u'id': {u'name': u'i',
u'type': u'Identifier'},
u'init': {u'type': u'Literal', u'value': 2},
u'type': u'VariableDeclarator'}],
u'kind': u'var',
u'type': u'VariableDeclaration'},
{u'declarations': [{u'id': {u'name': u'j',
u'type': u'Identifier'},
u'init': {u'type': u'Literal', u'value': 4},
u'type': u'VariableDeclarator'}],
u'kind': u'var',
u'type': u'VariableDeclaration'},
{u'declarations': [{u'id': {u'name': u'answer',
u'type': u'Identifier'},
u'init': {u'left': {u'name': u'i',
u'type': u'Identifier'},
u'operator': u'*',
u'right': {u'name': u'j',
u'type': u'Identifier'},
u'type': u'BinaryExpression'},
u'type': u'VariableDeclarator'}],
u'kind': u'var',
u'type': u'VariableDeclaration'}],
u'type': u'Program'}
推荐使用哪种方法行走上述复杂结构?
What is the recommended way to walk complex structures like the above?
除了少数几个字典外,大多数字典都包含字典,其结构可能变得更加复杂,因此我需要一个通用的解决方案.
Apart of a few list there are mostly dictionaries, the structure can become even more imbricated so I need a general solution.
推荐答案
您可以使用递归生成器将字典转换为平面列表.
You can use a recursive generator for converting your dictionary to flat lists.
def dict_generator(indict, pre=None):
pre = pre[:] if pre else []
if isinstance(indict, dict):
for key, value in indict.items():
if isinstance(value, dict):
for d in dict_generator(value, [key] + pre):
yield d
elif isinstance(value, list) or isinstance(value, tuple):
for v in value:
for d in dict_generator(v, [key] + pre):
yield d
else:
yield pre + [key, value]
else:
yield indict
返回
[u'body', u'kind', u'var']
[u'init', u'declarations', u'body', u'type', u'Literal']
[u'init', u'declarations', u'body', u'value', 2]
[u'declarations', u'body', u'type', u'VariableDeclarator']
[u'id', u'declarations', u'body', u'type', u'Identifier']
[u'id', u'declarations', u'body', u'name', u'i']
[u'body', u'type', u'VariableDeclaration']
[u'body', u'kind', u'var']
[u'init', u'declarations', u'body', u'type', u'Literal']
[u'init', u'declarations', u'body', u'value', 4]
[u'declarations', u'body', u'type', u'VariableDeclarator']
[u'id', u'declarations', u'body', u'type', u'Identifier']
[u'id', u'declarations', u'body', u'name', u'j']
[u'body', u'type', u'VariableDeclaration']
[u'body', u'kind', u'var']
[u'init', u'declarations', u'body', u'operator', u'*']
[u'right', u'init', u'declarations', u'body', u'type', u'Identifier']
[u'right', u'init', u'declarations', u'body', u'name', u'j']
[u'init', u'declarations', u'body', u'type', u'BinaryExpression']
[u'left', u'init', u'declarations', u'body', u'type', u'Identifier']
[u'left', u'init', u'declarations', u'body', u'name', u'i']
[u'declarations', u'body', u'type', u'VariableDeclarator']
[u'id', u'declarations', u'body', u'type', u'Identifier']
[u'id', u'declarations', u'body', u'name', u'answer']
[u'body', u'type', u'VariableDeclaration']
[u'type', u'Program']
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