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

拼搏现实的明天。 2022-12-21 04:53 152阅读 0赞

## 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.

![20180605085310483][]

**解决方案：**

将出错代码行改为：

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

[20180605085310483]: /images/20221120/b172b8d567fa4d289472889ab48d4eef.png