是否有不同的方法来检查python中的deque空(is there a different ways to check deque empty in python)

是否有不同的方法来检查python中的deque空(is there a different ways to check deque empty in python)

它们是一样的吗？？？？

while len(deque)>0: deque.popleft() while deque: deque.popleft()

所以基本上这两个条件循环可以避免从空队列中弹出？

Are they the same thing????

while len(deque)>0: deque.popleft() while deque: deque.popleft()

so basically these two condition loops can avoid poping from empty queue?

最满意答案

它们是相同的，但PEP 8更喜欢第二个版本。 我不相信它总是更容易阅读，所以要用自己的判断。

http://www.python.org/dev/peps/pep-0008/#programming-recommendations

对于序列，（字符串，列表，元组），请使用空序列为假的事实。

Yes: if not seq: if seq: No: if len(seq) if not len(seq)

They're the same, but PEP 8 prefers the second version. I'm not convinced that it's always easier to read though, so use your own judgement.

http://www.python.org/dev/peps/pep-0008/#programming-recommendations

For sequences, (strings, lists, tuples), use the fact that empty sequences are false.

Yes: if not seq: if seq: No: if len(seq) if not len(seq)