Python双端队列

Question

msg = 'afdssav'
MYQ = deque(msg)
MYPQ.append('asdf')

在这里,我试图创建一个字符串deque,但是当我弹出元素或尝试使用Python 2.7从中读取元素时,我会通过char获取char.

我怎样才能使它以与插入字符串相同的方式返回字符串？

即我想MYQ[1]成为'asdf'并MYQ.pop()返回msg.

Answer 1

可能是这样的:

MYQ = deque([msg])

演示:

In [1]: from collections import deque

In [2]: msg = 'afdssav'

In [3]: myq = deque([msg])

In [4]: myq.append('asdf')

In [5]: myq
Out[5]: deque(['afdssav', 'asdf'])

呼叫签名deque是:

deque([iterable[, maxlen]]) --> deque object

字符串是可迭代的,但是当您遍历字符串时,您将获得单个字符.因此你看到的行为:

In [7]: deque(msg)
Out[7]: deque(['a', 'f', 'd', 's', 's', 'a', 'v'])

您想要提供deque一个可生成整个字符串的iterable.