python - Convert nested iterables to list -

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is there easy way in python (using itertools, or otherwise) convert nested iterable f corresponding list or tuple? i'd save f can iterate on multiple times, means if nested elements of f generators, i'll in trouble.

i'll give example input/output.

>>> g = iter(range(2)) >>> my_input = [1, [2, 3], ((4), 5), [6, g]] >>> magical_function(my_input) [1, [2, 3], [[4], 5], [6, [0, 1]]]

it fine if output consisted of tuples, too. issue iterating on g "consumes" it, can't used again.

this seems best checking if each element iterable, , calling recursive function on if iterable. quick draw-up, try like:

import collections  g = iter(range(2)) my_input = [1, [2, 3], ((4), 5), [6, g]]  def unfold(iterable):     ret = []     element in iterable:         if isinstance(element, collections.iterable):             ret.append(unfold(element))         else:             ret.append(element)     return ret  n = unfold(my_input) print(n) print(n)

which returns

$ python3 so.py [1, [2, 3], [4, 5], [6, [0, 1]]] [1, [2, 3], [4, 5], [6, [0, 1]]]

it's not prettiest way, , can find ways improve (it puts in list instead of preserving tuples), here general idea use.


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