Python: I tried to make a flat / flat_map just right with a generator

I couldn't find anything just right, so I made it myself. Is it somewhere? What is "just right":

``` [[0], [1], [2]]-> [0, 1, 2] : Basic function of flat. Obvious
``` [0, [1], [[2]]]-> [0, 1, [2]]` ``: Elements that are not in the list remain as they are. Only one step. No recursion.
``` [(0, 1), {'a': 2,'b': 3}," 45 ", [6, 7]]-> [(0, 1), {'a': 2 ,'b': 3}, '45', 6, 7] `` `: Works only on list. Does not respond to other iterables.


flat = lambda xs : (
    y
    for x in xs
    for y in (
        [x] if type(x) is not list else
        x
        )
    )

Those who are not on the list are the strategy to lift them up on the list and then disassemble them. I made it a generator according to the style of Python.

With this, flat_map looks like this:

flat_map = lambda f, xs : flat( map( f, xs ) )

If you have any other suggestions, please leave a comment.

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