(defmacro define-stone-move-command (name keystroke dx dy)
`(define-maze-frame-command (,name :keystroke ,keystroke) ()
(let ((maze-array (maze-array *application-frame*)))
(move-stone maze-array ,dx ,dy)
(check-for-win maze-array)
(draw-maze-array *application-frame* *maze-stream*))))
如果dictA和dictB中的项目数量巨大,则效率低下
更快的方法吗?
我在想某种方式使用套装但不确定。
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这可能是重复的,但似乎人们在其他类似问题的答案中进行迭代
答案 0 :(得分:5)
您可以使用dict view objetcs:
键视图设置类似,因为它们的条目是唯一且可清除的。如果所有值都是可清除的,那么(键,值)对是唯一且可清除的,那么items视图也是类似于set。 (值视图不会被视为类似集合,因为条目通常不是唯一的。)然后这些设置操作可用(“其他”指的是另一个视图或集合):
dictview & other
Return the intersection of the dictview and the other object as a new set.
dictview | other
Return the union of the dictview and the other object as a new set.
dictview - other
Return the difference between the dictview and the other object (all elements in dictview that aren’t in other) as a new set.
dictview ^ other
Return the symmetric difference (all elements either in dictview or other, but not in both) of the dictview and the other object as a new set.
diff = dictA.viewkeys() - dictB.viewkeys()
print(diff)
set([])
print(dictA.viewitems() - dictB.viewitems())
set([('a', 1), ('c', 3)])
或设置:
print(set(dictA.iteritems()).difference(dictB.iteritems()))
你唯一的限制就是内存