如何在Docker中安装opencv

Question

这里有一个Dockerfile:

FROM python:3.10
RUN apt update
RUN apt install -y libopencv-dev python3-opencv

我可以在那个容器中打开bash：

$ docker  run -i -t  opencv /bin/bash

它安装了Debian:

# cat /etc/issue
Debian GNU/Linux 11 n l

它显示了opencv 4.5.1：

# apt install python3-opencv
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
python3-opencv is already the newest version (4.5.1+dfsg-5).

如果我尝试导入cv2，它没有找到：

# python3 -c "import cv2"
Traceback (most recent call last):
File "<string>", line 1, in <module>
ModuleNotFoundError: No module named 'cv2'

如果我问dpkg，它会说应该有哪些文件：

# dpkg -L python3-opencv
/.
/usr
/usr/lib
/usr/lib/python3
/usr/lib/python3/dist-packages
/usr/lib/python3/dist-packages/cv2.cpython-39-x86_64-linux-gnu.so
...

它们是：

# ls -l /usr/lib/python3/dist-packages/cv2.cpython-39-x86_64-linux-gnu.so
-rw-r--r-- 1 root root 6757472 Jun 16  2021 /usr/lib/python3/dist-packages/cv2.cpython-39-x86_64-linux-gnu.so
# which python3
/usr/local/bin/python3

所以。。缺少什么？我该如何使用看起来像已经安装好的opencv？有没有更简单的方法？

Answer 1

啊，看起来好像有两只蟒蛇。/usr/bin中的一个有效。

# ls -l /usr/bin/python3
lrwxrwxrwx 1 root root 9 Apr  5  2021 /usr/bin/python3 -> python3.9
# ls -l /usr/local/bin/python3
lrwxrwxrwx 1 root root 10 Apr  7 03:17 /usr/local/bin/python3 -> python3.10
# /usr/bin/python3 -c "import cv2"
#