带不带 set -e 的差别

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

steps = [0, 1, 0]
a_ran, a_code = run(steps, False)
b_ran, b_code = run(steps, True)
print(str(a_ran) + "-" + str(a_code) + "/"
      + str(b_ran) + "-" + str(b_code))