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Could not fetch URL https://pypi.python.org/simple/xxx/: There was a problem confirming the ssl certificate: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:749) - skipping
Could not find a version that satisfies the requirement xxx (from versions: )
No matching distribution found for xxx
resolve:
pip --trusted-host pypi.python.org install xxx
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[已解决]报错: Could not install packages due to an EnvironmentError: [Errno 13] Permission denied: '/