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

修复了我在OSX上的问题,在终端上运行以下程序:

open "/Applications/Python 3.9/Install Certificates.command"

其他回答

我通过更改代理设置来自动检测代理设置来解决这个问题。

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!

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。

这个页面上的任何东西都不适合我,直到我使用——verbose选项看到它想要获得files.pythonhosted.org而不是pypi.python.org:

pip install --trusted-host files.pythonhosted.org <package_name>

所以通过——verbose选项检查它失败的URL。

在我的情况下,这是由于SSL证书是由我公司的内部CA签署的。使用像pip——cert这样的变通方法并没有帮助,但是下面的包可以:

pip install pip_system_certs

参见:https://pypi.org/project/pip-system-certs/

这个包修补pip并在运行时请求使用来自默认系统存储的证书(而不是捆绑的certs ca)。 这将允许pip验证tls/ssl连接到您的系统安装信任的服务器。