问在维护结构的同时重置嵌套列表

EN

In [5]: def clear(seq):
   ...:     for i, item in enumerate(seq):
   ...:         try:
   ...:             clear(item)
   ...:         except TypeError:
   ...:             try:
   ...:                 seq[i] = 0
   ...:             except IndexError, KeyError:
   ...:                 pass
   ...:             

In [6]: s = [1,3,4,[5,2,[4,3],3],6,[7,8],9]

In [9]: clear(s)

In [10]: s
Out[10]: [0, 0, 0, [0, 0, [0, 0], 0], 0, [0, 0], 0]

>>> l = [1,3,4,[5,2,[4,3],3],6,[7,8],9]
>>> def reset(lst):
...     return [reset(e) if isinstance(e, list) else 0 for e in lst]
...
>>> l = reset(l)
>>> l
[0, 0, 0, [0, 0, [0, 0], 0], 0, [0, 0], 0]

def set_zero(lst):
    for i,element in enumerate(lst):
        if type(element) != list: lst[i]=0
        else: set_zero(element)

>>> a = [1,3,4,[5,2,[4,3],3],6,[7,8],9]
>>> set_zero(a)
>>> print(a)
[0,0,0,[0,0,[0,0],0],0,[0,0],0]