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

你有4个选择:

使用证书作为参数

$ pip install --cert /path/to/mycertificate.crt linkchecker

使用pip.conf中的证书

创建这个文件:

$HOME/.pip/pip.conf (Linux)

%HOME%\pip\pip.ini (Windows)

然后加上这几行:

[global]
cert = /path/to/mycertificate.crt

忽略证书并使用HTTP

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

忽略证书,在pip.conf中使用HTTP

创建这个文件:

$HOME/.pip/pip.conf (Linux)

%HOME%\pip\pip.ini (Windows)

然后加上这几行:

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

https://pip.pypa.io/en/latest/user_guide/#configuration

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。

您可以尝试使用http而不是https来绕过SSL错误。当然,这在安全性方面并不是最优的,但如果你赶时间,它应该可以做到:

pip install --index-url=http://pypi.python.org/simple/ linkchecker

我发现最直接的方法是下载和使用“DigiCert高保证EV根CA”从DigiCert https://www.digicert.com/digicert-root-certificates.htm#roots

您可以访问https://pypi.python.org/,通过点击地址栏中的锁图标来验证证书颁发者,或者通过使用openssl来增加您的极客信用:

$ openssl s_client -connect pypi.python.org:443
CONNECTED(00000003)
depth=1 /C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert SHA2 Extended Validation Server CA
verify error:num=20:unable to get local issuer certificate
verify return:0
---
Certificate chain
 0 s:/businessCategory=Private Organization/1.3.6.1.4.1.311.60.2.1.3=US/1.3.6.1.4.1.311.60.2.1.2=Delaware/serialNumber=3359300/street=16 Allen Rd/postalCode=03894-4801/C=US/ST=NH/L=Wolfeboro,/O=Python Software Foundation/CN=www.python.org
   i:/C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert SHA2 Extended Validation Server CA
 1 s:/C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert SHA2 Extended Validation Server CA
   i:/C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert High Assurance EV Root CA

证书链中的最后一个CN值为需要下载的CA的名称。

为了一次性的努力,请执行以下操作:

从DigiCert下载对照表 将CRT转换为PEM格式 2 .将PIP_CERT环境变量导出到PEM文件所在路径下

(最后一行假设您正在使用bash shell),然后运行pip。

curl -sO http://cacerts.digicert.com/DigiCertHighAssuranceEVRootCA.crt 
openssl x509 -inform DES -in DigiCertHighAssuranceEVRootCA.crt -out DigiCertHighAssuranceEVRootCA.pem -text
export PIP_CERT=`pwd`/DigiCertHighAssuranceEVRootCA.pem

要使其可重用,请放入digicerthighassurance anceevrootca。然后在~/.bashrc中导出相应的PIP_CERT。

尽管有40个答案,但我认为没有一个完全解决了我的问题。

我在macOS Catalina 10.15.5上,在公司代理的后面。

在尝试安装或升级包时,提示以下错误

>>> pip install <package name>                                                                                                                           

Looking in indexes: https://pypi.org/simple, https://data:****@pypi.<company>.com/simple/
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1108)'))': <package name>
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1108)'))': <package name>

@Steve_Tauber的回答pip——cert /etc/ssl/certs/FOO_Root_CA。Pem安装链接检查器让我的方式有一部分。

我能够使用现有的cert文件成功安装包,如下所示:

pip install --cert /Users/me/opt/anaconda3/ssl/cert.pem --upgrade pip

但是我不想每次使用pip时都使用cert标志…

答案是更新环境变量:

CERT_PATH=/Users/me/opt/anaconda3/ssl/cert.pem
export SSL_CERT_FILE=${CERT_PATH}
export REQUESTS_CA_BUNDLE=${CERT_PATH}

现在我可以安装了。

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。