Question

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

每当尝试安装任何 python3 包时，我都会收到此错误。

可能的原因是什么？
如何解决？

Answer 1

这是一个网络问题。当我搬到不同的网络时工作得很好。谢谢大家：）

Answer 2

它的scikit-学习不要在pypi上浏览。查看documentation here

尝试：

pip3 install scikit-learn

Answer 3

关于问题标题中的错误/警告消息：

缓存条目反序列化失败，条目被忽略

您可以通过删除点子缓存来修复它，例如在Ubuntu上：

rm -rf ~/.cache/pip

Answer 4

只需使用-no-cache-dir 运行pip命令。

例如：

>>> pip install keras --no-cache-dir

Answer 5

另一个原因可能是您的 Python 版本较低。例如，您在 python 3.6.0 上安装 tensorflow，您将获得 Cache entry deserialization failed, entry ignored 附带 tensorflow 的许多库。

但如果你使用 python 3.8.0，一切都很好。

缓存条目反序列化失败，条目被忽略

5 个答案: