Python：Python3错误提示TypeError: slice indices must be integers or None or have an __index__ method解决办法

在执行Python 3脚本时，报错：TypeError: slice indices must be integers or None or have an __index__ method，报错位置：

 # Now add left and right halves of images in each level
ls_image = []
for la, lb in zip(lp_image1, lp_image2):
rows, cols, dpt = la.shape
ls = np.hstack((la[:, 0:cols / 2], lb[:, cols / 2:]))
ls_image.append(ls)

出错代码行为：

ls = np.hstack((la[:, 0:cols / 2], lb[:, cols / 2:]))

问题原因：

In Python 3.x, 5 / 2 will return 2.5 and 5 // 2 will return 2. The former is floating point division, and the latter is floor division, sometimes also called integer division.

In Python 2.2 or later in the 2.x line, there is no difference for integers unless you perform a from __future__ import division, which causes Python 2.x to adopt the 3.x behavior.

Regardless of the future import, 5.0 // 2 will return 2.0 since that's the floor division result of the operation.

解决方案：

将出错代码行改为：

ls = np.hstack((la[:, 0:cols // 2], lb[:, cols // 2:]))