先看log
WARNING: You are using pip version 19.3.1; however, version 20.0.2 is available.
You should consider upgrading via the ‘python -m pip install --upgrade pip‘ command.
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C:\Users\think>python -m pip install --upgrade pip
Collecting pip
Downloading https://files.pythonhosted.org/packages/54/0c/d01aa759fdc501a58f431eb594a17495f15b88da142ce14b5845662c13f3/pip-20.0.2-py2.py3-none-any.whl (1.4MB)
|████████████████████████████████| 1.4MB 16kB/s
Installing collected packages: pip
Found existing installation: pip 19.3.1
Uninstalling pip-19.3.1:
Successfully uninstalled pip-19.3.1
Successfully installed pip-20.0.2
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严重的后果：
C:\Users\think>pip3 install imgaug
Collecting imgaug
Using cached imgaug-0.3.0-py2.py3-none-any.whl (819 kB)
Collecting opencv-python-headless
Downloading opencv_python_headless-4.1.2.30-cp37-cp37m-win_amd64.whl (33.0 MB)
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没有下载链接，要安装几乎是白日梦。
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解决方案：
python -m?pip install pip==19.3.1
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log如下：
C:\Users\think>python -m pip install pip==19.3.1
Collecting pip==19.3.1
Using cached pip-19.3.1-py2.py3-none-any.whl (1.4 MB)
Installing collected packages: pip
Attempting uninstall: pip
Found existing installation: pip 20.0.2
Uninstalling pip-20.0.2:
Successfully uninstalled pip-20.0.2
Successfully installed pip-19.3.1
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重新pip命令安装
C:\Users\think>pip3 install imgaug
Collecting imgaug
Using cached https://files.pythonhosted.org/packages/11/df/5a3bba95b4600d5ca7aff072082ef0d9837056dd28cc4e738e7ce88dd8f8/imgaug-0.3.0-py2.py3-none-any.whl
Requirement already satisfied: scikit-image>=0.14.2 in c:\program files (x86)\microsoft visual studio\shared\python37_64\lib\site-packages (from imgaug) (0.16.2)
Collecting opencv-python-headless
Downloading https://files.pythonhosted.org/packages/38/fa/9268c99a8868f32059a48bb8c2d63e45672e8b4f6c136b8fa6c2c0be94c8/opencv_python_headless-4.1.2.30-cp37-cp37m-win_amd64.whl (33.0MB)
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找到链接，迅雷下载后再手动安装既可以
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原文地址：https://www.cnblogs.com/xiexiaokui/p/12237838.html