numpy-等效于list.pop? [英] numpy-equivalent of list.pop?
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问题描述
是否有一个numpy方法与python列表的内置pop
等效?
Is there a numpy method which is equivalent to the builtin pop
for python lists?
在numpy数组上显然无法进行抽奖,并且我想避免列表转换.
Popping obviously doesn't work on numpy arrays, and I want to avoid a list conversion.
推荐答案
NumPy数组没有pop
方法,但是您可以只使用基本切片(这很有效,因为它返回一个视图,而不是副本) :
There is no pop
method for NumPy arrays, but you could just use basic slicing (which would be efficient since it returns a view, not a copy):
In [104]: y = np.arange(5); y
Out[105]: array([0, 1, 2, 3, 4])
In [106]: last, y = y[-1], y[:-1]
In [107]: last, y
Out[107]: (4, array([0, 1, 2, 3]))
如果有pop
方法,它将在y
中返回last
值并修改y
.
If there were a pop
method it would return the last
value in y
and modify y
.
以上
last, y = y[-1], y[:-1]
将最后一个值分配给变量last
并修改y
.
assigns the last value to the variable last
and modifies y
.
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