exec 之后还剩什么

运行下面这段程序，填写它打印出来的结果。

before = {"pid": 15, "prog": "python3", "开着的号": [0, 1, 2, 3]}
after = {"pid": 15, "prog": "echo", "开着的号": [0, 1, 2, 3]}
print(str(before["pid"] == after["pid"]) + "/"
      + str(before["prog"] == after["prog"]) + "/"
      + str(len(after["开着的号"])))