Flatten is used in numpy:

https://numpy.org/doc/stable/reference/generated/numpy.ndarray.flatten.html?highlight=flatten#numpy.ndarray.flatten

Where it is a method, and goes all the way to one dimension.

A builtin flatten can’t be the same, but it would be nice if it weren’t too different. e.g. list(flatten(a_2d_array)) would do the same thing as list(a_2d_array.flatten()).

For a builtin, perhaps it could take an optional integer “depth” parameter which would provide flexibility and be

one way to control its behavior with strings.

-CHB

On Sat, Jun 19, 2021 at 8:36 AM Marc-Andre Lemburg <mal@egenix.com> wrote:

On 19.06.2021 17:17, Serhiy Storchaka wrote:
> 19.06.21 18:12, Marc-Andre Lemburg пише:
>>> But there could be endless debate about whether flatten( ("x", "y") ) should
>>> return a list or a tuple...
>>
>> Have it return an iterator :-)
>
> flatten = itertools.chain.from_iterable

Well, like I said: modulo the discussion around what "flatten"
should mean, e.g. you will probably want to have flatten() go
a certain number of levels deep and not necessarily flatten
strings.

But yes, such a definition is certainly a good start.

--
Marc-Andre Lemburg
eGenix.com

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