“无法获取索引基URL”错误消息时，试图安装scikit-学习Python 3

Question

我试着安装scikit-学习Python 3。我这样做的方式如下：

virtualenv model_env
source  model_env/bin/activate
pip3 install sklearn

因此，我得到以下错误消息：

Downloading/unpacking sklearn
  Cannot fetch index base URL https://pypi.python.org/simple/
  Could not find any downloads that satisfy the requirement sklearn
Cleaning up...
No distributions at all found for sklearn

我在pandas包中遇到了同样的问题，我使用以下命令解决了这个问题：

sudo apt-get install python3-pandas

不幸的是，同样的方法不适用于sklearn

sudo apt-get install python3-sklearn

添加了

当我用sklearn替换scikit-learn时，我也遇到了同样的问题：

Downloading/unpacking scikit-learn
  Cannot fetch index base URL https://pypi.python.org/simple/
  Could not find any downloads that satisfy the requirement scikit-learn
Cleaning up...
No distributions at all found for scikit-learn

添加2

正如建议的那样，我尝试将pip与-vvv结合使用。请注意，我使用的是pip3而不是pip。这就是我得到的结果：

Downloading/unpacking scikit-learn
  Getting page https://pypi.python.org/simple/scikit-learn/
  Could not fetch URL https://pypi.python.org/simple/scikit-learn/: connection error: HTTPSConnectionPool(host='pypi.python.org', port=443): Max retries exceeded with url: /simple/scikit-learn/ (Caused by <class 'OSError'>: [Errno 101] Network is unreachable)
  Will skip URL https://pypi.python.org/simple/scikit-learn/ when looking for download links for scikit-learn
  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 'OSError'>: [Errno 101] Network is unreachable)
  Will skip URL https://pypi.python.org/simple/ when looking for download links for scikit-learn
  Cannot fetch index base URL https://pypi.python.org/simple/
  URLs to search for versions for scikit-learn:
  * https://pypi.python.org/simple/scikit-learn/
  Getting page https://pypi.python.org/simple/scikit-learn/
  Could not fetch URL https://pypi.python.org/simple/scikit-learn/: connection error: HTTPSConnectionPool(host='pypi.python.org', port=443): Max retries exceeded with url: /simple/scikit-learn/ (Caused by <class 'OSError'>: [Errno 101] Network is unreachable)
  Will skip URL https://pypi.python.org/simple/scikit-learn/ when looking for download links for scikit-learn
  Could not find any downloads that satisfy the requirement scikit-learn
Cleaning up...
  Removing temporary dir /tmp/pip_build_root...
No distributions at all found for scikit-learn
Exception information:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/pip/basecommand.py", line 122, in main
    status = self.run(options, args)
  File "/usr/lib/python3/dist-packages/pip/commands/install.py", line 278, in run
    requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle)
  File "/usr/lib/python3/dist-packages/pip/req.py", line 1178, in prepare_files
    url = finder.find_requirement(req_to_install, upgrade=self.upgrade)
  File "/usr/lib/python3/dist-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 scikit-learn

Storing debug log for failure in /home/rngorb/.pip/pip.log

Answer 1

试着使用

pip3 install scikit-learn

Answer 2

首先更新您的pip：

pip3 install --upgrade pip

然后安装scikit-学习arg“--用户”。不要和pip一起使用sudo，因为它会产生问题：

pip install --user scikit-learn

Answer 3

也许您应该考虑使用蟒蛇 (默认情况下包括两个包)，并使用管理环境和套餐的工具简化您的生活。