pip install failed with "connection error: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:598)"

我对Python非常陌生，并试图在Windows 7上安装链接检查器。一些注意事项:

pip install is failing no matter the package. For example, > pip install scrapy also results in the SSL error. Vanilla install of Python 3.4.1 included pip 1.5.6. The first thing I tried to do was install linkchecker. Python 2.7 was already installed, it came with ArcGIS. python and pip were not available from the command line until I installed 3.4.1. > pip search linkchecker works. Perhaps that is because pip search does not verify the site's SSL certificate. I am in a company network but we do not go through a proxy to reach the Internet. Each company computer (including mine) has a Trusted Root Certificate Authority that is used for various reasons including enabling monitoring TLS traffic to https://google.com. Not sure if that has anything to do with it.

下面是运行pip install linkchecker后我的pip.log的内容:

Downloading/unpacking linkchecker
  Getting page https://pypi.python.org/simple/linkchecker/
  Could not fetch URL https://pypi.python.org/simple/linkchecker/: connection error: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:598)
  Will skip URL https://pypi.python.org/simple/linkchecker/ when looking for download links for linkchecker
  Getting page https://pypi.python.org/simple/
  Could not fetch URL https://pypi.python.org/simple/: connection error: HTTPSConnectionPool(host='pypi.python.org', port=443): Max retries exceeded with url: /simple/ (Caused by <class 'http.client.CannotSendRequest'>: Request-sent)
  Will skip URL https://pypi.python.org/simple/ when looking for download links for linkchecker
  Cannot fetch index base URL https://pypi.python.org/simple/
  URLs to search for versions for linkchecker:
  * https://pypi.python.org/simple/linkchecker/
  Getting page https://pypi.python.org/simple/linkchecker/
  Could not fetch URL https://pypi.python.org/simple/linkchecker/: connection error: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:598)
  Will skip URL https://pypi.python.org/simple/linkchecker/ when looking for download links for linkchecker
  Could not find any downloads that satisfy the requirement linkchecker
Cleaning up...
  Removing temporary dir C:\Users\jcook\AppData\Local\Temp\pip_build_jcook...
No distributions at all found for linkchecker
Exception information:
Traceback (most recent call last):
  File "C:\Python34\lib\site-packages\pip\basecommand.py", line 122, in main
    status = self.run(options, args)
  File "C:\Python34\lib\site-packages\pip\commands\install.py", line 278, in run
    requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle)
  File "C:\Python34\lib\site-packages\pip\req.py", line 1177, in prepare_files
    url = finder.find_requirement(req_to_install, upgrade=self.upgrade)
  File "C:\Python34\lib\site-packages\pip\index.py", line 277, in find_requirement
    raise DistributionNotFound('No distributions at all found for %s' % req)
pip.exceptions.DistributionNotFound: No distributions at all found for linkchecker

当前回答

如果您正在使用Anaconda，并且只有在环境中运行pip时才会遇到此问题，则可能需要重新安装python。

在需要的环境中运行conda install python。

2020-09-13 17:55:31

其他回答

这对我来说很管用:

$ sudo mv /etc/ssl/cert.pem /etc/ssl/cert.pem.BAK

在我的情况下，我在安装pip时得到了相同的错误，在尝试运行aws CLI命令时也出现了类似的错误。这一周一切正常，下一周就不正常了。AFAIK，我没有安装任何会破坏SSL的东西。

我在MacOS大苏尔，尝试了不同版本的Python 3。通过pyenv和Brew安装。我尝试了这篇文章中列出的所有相关解决方案。我甚至重新安装了操作系统，但还是不行。

2021-07-04 22:31:42

对我来说，这是因为以前我正在运行脚本，设置代理(到提琴手)，重新打开控制台或重新启动修复问题。

2017-03-30 21:36:45

首先，

    pip install --trusted-host pypi.python.org <package name>

对我没用。我一直得到CERTIFICATE_VERIFY_FAILED错误。然而，我在错误消息中注意到他们引用了“pypi.org”站点。因此，我使用this作为可信主机名，而不是pypi.python.org。这句话几乎把我带到了那里;使用CERTIFICATE_VERIFY_FAILED加载仍然失败，但在稍后的时间点。找到了失败的网站的引用，我把它作为一个可信任的主机。最终对我有用的是:

    pip install --trusted-host pypi.org --trusted-host files.pythonhosted.org <package name>

2018-04-23 16:50:41

要使用的答案

pip install --trusted-host pypi.python.org <package>

工作。但你必须检查是否有重定向或缓存pip正在击中。在安装了pip 9.0.1的Windows 7上，我必须运行

pip install \
  --trusted-host pypi.python.org \
  --trusted-host pypi.org \
  --trusted-host files.pythonhosted.org \
  <package>

您可以使用verbose标志找到这些。

2018-04-25 19:46:46

我尝试了这个回答博客中提供的大多数解决方案，但是没有一个有效，我在尝试安装python包时遇到了这个ssl证书错误。

我通过以下命令成功执行:

python -m pip install PACKAGENAME --trusted-host=pypi.python.org --trusted-host=pypi.org --trusted-host=files.pythonhosted.org

2020-10-18 23:16:45

pip install failed with "connection error: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:598)"

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