pip安装报错：HTTPSConnectionPool(host=‘files.pythonhosted.org‘, port=443): Read timed out.
问题：直接使用pip安装报错
D:\Python39\Scripts>pip install opencv-python==4.5.2.54
Collecting opencv-python==4.5.2.54
Downloading opencv_python-4.5.2.54-cp39-cp39-win_amd64.whl (34.7 MB)
|████████████████████████████████| 34.7 MB 656 kB/s
Collecting numpy>
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2021-07-28 21:49:15 ·
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