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

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

其他回答

不要跳过!找到Linux的安全解决方案

所有使用——trusted-host将pypi.org添加到可信站点的解决方案都是不安全的，基本上跳过了https，并没有真正解决问题。每个使用这种方法的人，请尝试以这种方式更新您的证书，并删除——trusted-host标志:

sudo yum -y update ca-certificates
export PIP_CERT=/etc/ssl/certs/ca-bundle.crt

安全很重要!

2020-10-15 08:51:25

我也遇到过类似的问题。对我有效的解决方法 1)卸载python 2.7 2)删除python27文件夹 3)重新安装最新的python

2019-05-30 13:17:25

我尝试使用公司代理，但失败了。

我使用的是Python 3.6。

Pip.conf文件丢失。

下面是解决这个问题的步骤:

安装证书包:-pip——truste- host pypi.python.org——truste- host files.pythonhosted.org——truste- host pypi.org 创建一个pip.conf文件，如下所示:

     $ cd ~/.config 
     $ mkdir pip
     $ cd pip
     $ nano pip.conf

将以下内容添加到新创建的.conf文件中，并保存。

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

一切都完成了，它开始工作了。

2021-02-12 05:22:43

使用——cert参数:

您可以使用以下命令指定证书:

pip --cert <path/to/cert>.pem install <package list>

例如:

pip --cert /etc/ssl/certs/FOO_Root_CA.pem install linkchecker

参见:文档»参考指南»pip

如果指定您公司的根证书不起作用，也许cURL证书可以工作:http://curl.haxx.se/ca/cacert.pem

必须使用PEM文件，而不是CRT文件。如果你有一个CRT文件，你将需要将文件转换为PEM。评论中有报告说，这现在与CRT文件一起工作，但我还没有验证。

还要检查:SSL证书验证。

2014-09-26 14:59:52

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

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

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