Equality of nested iterables

iterables_equal.py

from collections import Counter

def iterables_equal(a, b):
    """
    Returns true if and only if two iterables of hashable objects are equal up to their
    order. Iterables can be nested.

    For example:

        iterable_equality([1, 2], [2, 1])  # True
        iterable_equality([1],    [1, 1])  # False
    """
    
    def isiterable(obj: Any) -> bool:
        try:
            iter(obj)
            return not isinstance(obj, str)
        except TypeError:
            return False

    def counts(c):
        if isiterable(c):
            return tuple(Counter([counts(d) for d in c]).items())
        return c

    if isiterable(a) and isiterable(b):
        return set(counts(a)) == set(counts(b))
    return a == b