python:使用pip安裝openpyxl報錯，網上找的文章很有用，記錄一下

使用pip install openpyxl老是報錯，詳見下圖： Could not fetch URL https://pypi.org/simple/openpyxl/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host=‘pypi.org’, port=443): Max retries

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