ERROR: Could not build wheels for opencv-python, which is required to install pyproject.toml-based

系统环境

# macOS系统版本
$ sw_vers
ProductName:    Mac OS X
ProductVersion: 10.14.4
BuildVersion:   18E2035

# Python版本
$ python --version
Python 3.9.13
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问题描述

安装opencv-python报错，安装失败

# 安装opencv-python 的命令
pip install opencv-python
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安装报错

ERROR: Could not build wheels for opencv-python, which is required to install pyproject.toml-based projects
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问题解决

仔细翻看报错日志，发现一个提示

unable to find utility "nasm", not a developer tool or in PATH
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那么安装缺少的依赖nasm

brew reinstall nasm
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再次尝试安装opencv-python，久等之后发现成功了

$ pip install opencv-python

Installing collected packages: opencv-python
Successfully installed opencv-python-4.8.1.78
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很多文章说是版本问题，这个也有可能，需要视情况而定

问题二

当我再次安装指定版本的opencv-python 时候

pip install opencv-python==4.7.0.72
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有新的报错

Trying 'Ninja' generator - failure

Trying 'Unix Makefiles' generator - failure
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查看我之前安装的版本，发现不一样，指定上次安装的版本就安装成功了

pip install opencv-python==4.8.1.78

Successfully installed numpy-1.26.2 opencv-python-4.8.1.78
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参考文章

• 如何让 nasm 在 MacOS 的终端中作为命令工作？