缺了几样
A 机器装了这些包，B 机器装了那些包。代码要的是 need。看看 B 缺几样、缺哪些：
a = {"httpkit", "urlkit", "charkit", "templ"}
b = {"urlkit", "templ"}
need = {"httpkit", "templ", "charkit"}
missing = sorted(need - b)
print(str(len(need - a)) + "/" + str(len(missing)) + "/" + ",".join(missing))
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