windows下 pip install opencv-python 报错

[lix19937]

Python 3.6.8 环境下

 pip install opencv-python==4.9.0.80 -i http://mirrors.aliyun.com/pypi/simple/  --trusted-host mirrors.aliyun.com

    opencv_imgproc_SSE4_1.vcxproj -> C:\Users\lix\AppData\Local\Temp\pip-install-6pordhje\opencv-python_fe0dad2395584b32a0aaaef0f66c20bb\_skbuild\win-amd64-3.6\cmake
-build\modules\imgproc\opencv_imgproc_SSE4_1.dir\Release\opencv_imgproc_SSE4_1.lib
  e:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\IDE\VC\VCTargets\Microsoft.CppBuild.targets(399,5): warning MSB8029: 中间目录或输出目录无法驻
留在临时目录下，因为这可能会导致增量生成出现问题。 [C:\Users\lix\AppData\Local\Temp\pip-install-6pordhje\opencv-python_fe0dad2395584b32a0aaaef0f66c20bb\_skbuild\win-
amd64-3.6\cmake-build\modules\python_bindings_generator\gen_opencv_python_source.vcxproj]
  e:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\IDE\VC\VCTargets\Microsoft.CppBuild.targets(321,5): error MSB3491: 未能向文件“x64\Release\ge
n_opencv_python_source\gen_open.F3A9E34F.tlog\gen_opencv_python_source.lastbuildstate”写入命令行。指定的路径或文件名太长，或者两者都太长。完全限定文件名必须少于 260
 个字符，并且目录名必须少于 248 个字符。 [C:\Users\lix\AppData\Local\Temp\pip-install-6pordhje\opencv-python_fe0dad2395584b32a0aaaef0f66c20bb\_skbuild\win-amd64-3.6\
cmake-build\modules\python_bindings_generator\gen_opencv_python_source.vcxproj]
  e:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\IDE\VC\VCTargets\Microsoft.CppBuild.targets(399,5): warning MSB8029: 中间目录或输出目录无法驻
留在临时目录下，因为这可能会导致增量生成出现问题。 [C:\Users\lix\AppData\Local\Temp\pip-install-6pordhje\opencv-python_fe0dad2395584b32a0aaaef0f66c20bb\_skbuild\win-
amd64-3.6\cmake-build\modules\.firstpass\videoio\opencv_videoio_plugins.vcxproj]
    Building Custom Rule C:/Users/lix/AppData/Local/Temp/pip-install-6pordhje/opencv-python_fe0dad2395584b32a0aaaef0f66c20bb/opencv/modules/videoio/CMakeLists.txt
  Traceback (most recent call last):

[lix19937]

发现是python版本比较低，直接安装的话，高版本的opencv和低版本的python难以匹配。

从

pip install opencv-python==4.9.0.80 -i http://mirrors.aliyun.com/pypi/simple/  --trusted-host mirrors.aliyun.com

改为

pip install opencv-python==4.2.0.34 -i http://mirrors.aliyun.com/pypi/simple/  --trusted-host mirrors.aliyun.com

OK

ref
https://blog.csdn.net/WYKB_Mr_Q/article/details/131677242
https://stackoverflow.com/questions/64373381/error-could-not-build-wheels-for-opencv-python-which-use-pep-517-and-cannot-be

[lix19937]

also see #2

[lix19937]

pip install opencv-python==4.4.0.46 -i http://mirrors.aliyun.com/pypi/simple/ --trusted-host mirrors.aliyun.com