人在环恢复、权限变化与自治评估：练习答案

参考实现

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a["version"] = 3
assert resume(a,p,19,{"draft:7"}) == "changed"
p["identity"] = ("t1",3,"draft:7")
assert resume(a,p,19,{"draft:7"}) == "ready"
assert resume(a,p,19,set()) == "revoked"
print("changed then reapproved then revoked")

审批只对当时的动作有效，不能冻结后续权限检查。

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