循环跑了几次

运行下面这段程序，填写它打印出来的结果。

def run(steps, stop_on_error=False):
    """steps 是一串退出码；返回 (跑了几条, 整个脚本的退出码)"""
    ran = 0
    last = 0
    for rc in steps:
        ran = ran + 1
        last = rc
        if stop_on_error and rc != 0:
            return ran, rc
    return ran, last

def ok(rc):
    return rc == 0

files = ["a.txt", "b.txt", "c.txt", "d.txt"]
rcs = [0, 0, 1, 0]
ran, code = run(rcs)
print(str(len(files)) + "/" + str(ran) + "/" + str(code))