使用镜像源和trust-host解决：Could not fetch URL https://pypi.org/simple/xxxx/

pip install xxx包报错：

Could not fetch URL https://pypi.org/simple/xxxx/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/cleanlab/ (Caused by SSLError(SSLEOFError(8, 'EOF occurred in violation of protocol (_ssl.c:1125)'))) - skipping
ERROR: Could not find a version that satisfies the requirement cleanlab
ERROR: No matching distribution found for cleanlab

解决方法，使用镜像源和trust-host：

Pip install xxxx -i http://pypi.douban.com/simple --trusted-host pypi.douban.com

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使用镜像源和trust-host解决：Could not fetch URL https://pypi.org/simple/xxxx/

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