human
Here's a good function header given the following:
I wrote the below code

    if (len(syms) == 0):
        raise ValueError('One    or    more    symbols    must    be    given    in    syms.')
    if finset_intersection.is_EmptySet:
        return EmptySet()
    if isinstance(finset_intersection, Union):
        elm_in_sets = finset_intersection.args[0]
        return Union(not_empty_in(finset_intersection.args[1], *syms), elm_in_sets)
    if isinstance(finset_intersection, FiniteSet):
        finite_set = finset_intersection
        _sets = S.Reals
    else:
        finite_set = finset_intersection.args[1]
        _sets = finset_intersection.args[0]
    if (not isinstance(finite_set, FiniteSet)):
        raise ValueError(('A    FiniteSet    must    be    given,    not    %s:    %s' % (type(finite_set), finite_set)))
    if (len(syms) == 1):
        symb = syms[0]
    else:
        raise NotImplementedError(('more    than    one    variables    %s    not    handled' % (syms,)))
    def elm_domain(expr, intrvl):
        '    Finds    the    domain    of    an    expression    in    any    given    interval    '
        from sympy.solvers.solveset import solveset
        _start = intrvl.start
        _end = intrvl.end
        _singularities = solveset(expr.as_numer_denom()[1], symb, domain=S.Reals)
        if intrvl.right_open:
            if (_end is S.Infinity):
                _domain1 = S.Reals
            else:
                _domain1 = solveset((expr < _end), symb, domain=S.Reals)
        else:
            _domain1 = solveset((expr <= _end), symb, domain=S.Reals)
        if intrvl.left_open:
            if (_start is S.NegativeInfinity):
                _domain2 = S.Reals
            else:
                _domain2 = solveset((expr > _start), symb, domain=S.Reals)
        else:
            _domain2 = solveset((expr >= _start), symb, domain=S.Reals)
        expr_with_sing = Intersection(_domain1, _domain2)
        expr_domain = Complement(expr_with_sing, _singularities)
        return expr_domain
    if isinstance(_sets, Interval):
        return Union(*[elm_domain(element,...

What's a good function header?
assistant
#Here's a good function header.

def not_empty_in(finset_intersection, *syms):