如何在Python中使用开始和结束标志从另一个列表构造嵌套列表

使用递归函数、迭代器来避免跟踪当前项，并利用列表的易变性:

def to_nested(inpt, out=None):
    it = iter(inpt)   # use an iterator
    if out is None: # optional: just to avoid using a list as default
        out = []    #
    for item in it:
        if item == 'begin': # if begin, let's start a new level
            out.append([])  # add a new list and pass this recursively
            to_nested(it, out=out[-1])
        elif item == 'end': # if end, let's finish this recursion
            return
        else:               # else, add an item to the current level
            out.append(item)
    return out

to_nested([0, 'begin', 1, 2, 'begin', 3, 4, 'end', 5, 'end', 6])
# [0, [1, 2, [3, 4], 5], 6]

Note that this assumes a correct format (as many ends as there are begins). If not, you would have to keep track of them.个

modification of your approach using an iterator like I did

inpt = [0, 'begin', 1, 2, 'begin', 3, 4, 'end', 5, 'end', 6]

def create_nest(items, nest):
    items = iter(items)
    for item in items:
        if item == 'begin':
            nest.append(create_nest(items, []))
        elif item == 'end':
            return nest
        else:
            nest.append(item)
    return nest

nested_list = []
create_nest(inpt, nested_list)
# [0, [1, 2, [3, 4], 5], 6]