# generic_nest_yield.py

# generic_nest_yield.py

def nested_loops(ranges, current_depth=0, current_result=[]):
    if current_depth == len(ranges):
        yield current_result
    else:
        for i in ranges[current_depth]:
            yield from nested_loops(ranges, current_depth + 1, current_result + [i])

ranges = [range(30, 50), range(10, 30, 5), ('x', 'y', 'z')]
for result in nested_loops(ranges):
    print(result)