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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def flatten_iterable(iterable):
 """ Flattens a nested iterable into a single layer. Generator. If you only want to flatten a single level, use more_itertools.flatten. Example:: ['t1', 't2', 'l1', 'l2', 'l1', 'l2'] True """

    for item in iterable:
        if isinstance(item, Iterable) and not isinstance(item, string_types):
            for sub in flatten_iterable(item):
                yield sub
        else:
            yield item