如何在python中展平嵌套列表？

Question

我怎样才能转换:

THIS = \
['logging',
 ['logging', 'loggers',
  ['logging', 'loggers', 'MYAPP',
   ['logging', 'loggers', 'MYAPP', '-handlers'],
   ['logging', 'loggers', 'MYAPP', 'propagate']
  ]
 ],
 ['logging', 'version']
]

成:

THAT = [
    ['logging'],
    ['logging', 'version'],
    ['logging', 'loggers'],
    ['logging', 'loggers', 'MYAPP'],
    ['logging', 'loggers', 'MYAPP', '-handlers'],
    ['logging', 'loggers', 'MYAPP', 'propagate']
]

在python中(它不需要排序,只是扁平化)？

我已经尝试了很多东西但是找不到如何解决这个问题.

Answer 1

用递归生成器解决

def flatten(items):
    non_list_items = []

    for item in items:
        if isinstance(item, list):
            for inner_item in flatten(item):
                yield inner_item
        else:
            non_list_items.append(item)

    yield non_list_items

根据您的输入进行测试：

from pprint import pprint

>>> pprint(sorted(flatten(THIS)))
[['logging'],
 ['logging', 'loggers'],
 ['logging', 'loggers', 'MYAPP'],
 ['logging', 'loggers', 'MYAPP', '-handlers'],
 ['logging', 'loggers', 'MYAPP', 'propagate'],
 ['logging', 'version']]