[英]Python Deque appendleft with list
I am currently creating my deque
object using the following, 我目前正在使用以下方法创建我的deque
对象,
self.CommandList = deque((['S', False, 60],['c'],['g16'],['i50'],['r30', True],['u320'],['o5000'],['b1'],['B4500'],['W1'],['l5154'],['!10'],['p2', True, 10],['e1'],['K20'],['U0'],['Y0']))
But I wish to add a similar list to the queue later but using appendleft
, so it can jump ahead of the list. 但我希望稍后在队列中添加类似的列表,但是使用appendleft
,因此它可以跳到列表之前。 I assumed the following, but had no luck. 我假设如下,但没有运气。
NewList = (['S'],['c'],['!10'],['p4'],['o1200'],['i50'],['r30'],['b10'],['d1'],['A', True, 163])
self.CommandList.appendleft(NewList)
Is this even possible with appendleft
? 这有可能与appendleft
?
I think you want .extendleft
here. 我想你想要.extendleft
。 This will "extend the list" instead of just appending the list as one element. 这将“扩展列表”而不是仅将列表作为一个元素附加。
z = collections.deque([1,2,3,4]) # [1, 2, 3, 4]
z.appendleft(['bad', 'news']) # [ ['bad', 'news'], 1, 2, 3, 4 ]
z.extendleft(['good', 'news']) # [ 'good', 'news', ['bad', 'news'], 1, 2, 3, 4 ]
If they are getting inserted in reverse, the quick fix is to just reverse the list: 如果它们反向插入,快速修复就是反转列表:
z.extendleft(reversed(['good', 'news']))
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