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

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

其他回答

对我来说，创建一个文件夹就解决了这个问题 Pip，有一个文件:Pip .ini 在 C:\Users\ <用户名> \ AppData \ \徘徊例句:

C:\Users\<username>\AppData\Roaming\pip\pip.ini

我在信里写道:

[global]
trusted-host = pypi.python.org
               pypi.org
               files.pythonhosted.org

我重新启动python，然后pip永久信任这些站点，并使用它们下载包。

如果你在windows上找不到AppData文件夹，在文件资源管理器中写入% AppData %，它就会出现。

2018-08-24 14:24:07

Kenorb的回答非常有用(而且很棒!) 在他的解决方案中，这可能是最简单的一个: ——可信主机

例如，在这种情况下你可以这样做

pip install --trusted-host pypi.python.org linkchecker

pem文件(或任何其他文件)是不必要的。

2016-10-24 07:50:36

我对pip 21.0.1有这个问题，没有一个答案对我有效。一些人通过降低pip版本来解决这个问题。

如果在2021年你仍然有这个问题，我确实降级到pip 20.2.4，现在它起作用了。

2021-03-28 06:22:55

在连接中设置代理，然后运行:

curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py --proxy proxy:80

2021-09-10 15:48:45

我使用easy_install安装了pip 1.2.1，并升级到pip的最新版本(当时是6.0.7)，该版本能够在我的情况下安装包。

easy_install pip==1.2.1
pip install --upgrade pip

2015-02-04 14:20:33

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

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