Python 缓存条目反序列化失败，条目被忽略
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Cache entry deserialization failed, entry ignored
提问by Pronomita Dey
C:\Users\deypr>pip3 install sklearn
Collecting sklearn
Cache entry deserialization failed, entry ignored
Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError(1, '[SSL: TLSV1_ALERT_ACCESS_DENIED] tlsv1 alert access denied (_ssl.c:777)'),)': /simple/sklearn/
Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError(1, '[SSL: TLSV1_ALERT_ACCESS_DENIED] tlsv1 alert access denied (_ssl.c:777)'),)': /simple/sklearn/
Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError(1, '[SSL: TLSV1_ALERT_ACCESS_DENIED] tlsv1 alert access denied (_ssl.c:777)'),)': /simple/sklearn/
Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError(1, '[SSL: TLSV1_ALERT_ACCESS_DENIED] tlsv1 alert access denied (_ssl.c:777)'),)': /simple/sklearn/
Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError(1, '[SSL: TLSV1_ALERT_ACCESS_DENIED] tlsv1 alert access denied (_ssl.c:777)'),)': /simple/sklearn/
Could not fetch URL https://pypi.python.org/simple/sklearn/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.python.org', port=443): Max retries exceeded with url: /simple/sklearn/ (Caused by SSLError(SSLError(1, '[SSL: TLSV1_ALERT_ACCESS_DENIED] tlsv1 alert access denied (_ssl.c:777)'),)) - skipping
Could not find a version that satisfies the requirement sklearn (from versions: )
No matching distribution found for sklearn
I am getting this error whenever trying to install any python3package.
每当尝试安装任何python3包时，我都会收到此错误。
What could be the possible reasons?
How to fix it ?
可能的原因是什么？
如何解决？
采纳答案by Pronomita Dey
It was a network issue. Worked totally fine when I moved to a different network. Thank you everyone :)
那是网络问题。当我移动到不同的网络时，工作完全正常。谢谢大家 ：）
回答by Franck Dernoncourt
Regarding the error/warning message in the question's title:
关于问题标题中的错误/警告消息：
Cache entry deserialization failed, entry ignored
缓存条目反序列化失败，条目被忽略
You can fix it by removing the pip cache, e.g. on Ubuntu:
您可以通过删除 pip 缓存来修复它，例如在 Ubuntu 上：
rm -rf ~/.cache/pip
回答by Vivek Kumar
Its scikit-learn not sklearn on pypi. Check the documentation here
它的 scikit-learn 不是 pypi 上的 sklearn。检查文档here
Try:
尝试：
pip3 install scikit-learn
回答by B. Kanani
Just run the pip command with --no-cache-dir.
只需使用--no-cache-dir运行 pip 命令。
For example:
例如：
>>> pip install keras --no-cache-dir
