无法在Anaconda虚拟环境中安装软件包.“当前频道无法提供套餐" [英] Unable to install packages in Anaconda virtual environment. 'Packages are not available from current channels'

问题描述

我正在尝试在Anaconda中创建一个新的Python环境.我正在使用Anaconda Powershell Prompt，并使用

I am trying to create a new Python environment in Anaconda. I am using Anaconda Powershell Prompt and created the environment using the

conda create --name adwp1 python=3.5 -y;
conda activate adwp1  
conda install notebook=4.2.3 -y;

和

pip install notebook = 4.2.3

使用 conda install

    Collecting package metadata (current_repodata.json): done
    Solving environment: failed with initial frozen solve. Retrying with flexible solve.
    Collecting package metadata (repodata.json): done
    Solving environment: failed with initial frozen solve. Retrying with flexible solve.

PackagesNotFoundError: The following packages are not available from current channels:

  - notebook=4.2.3

Current channels:

  - https://repo.anaconda.com/pkgs/main/win-64
  - https://repo.anaconda.com/pkgs/main/noarch
  - https://repo.anaconda.com/pkgs/r/win-64
  - https://repo.anaconda.com/pkgs/r/noarch
  - https://repo.anaconda.com/pkgs/msys2/win-64
  - https://repo.anaconda.com/pkgs/msys2/noarch

To search for alternate channels that may provide the conda package you're
looking for, navigate to

    https://anaconda.org

，然后使用页面顶部的搜索栏.

and use the search bar at the top of the page.

**，当我使用** pip install 时，出现以下错误

**and when I use ** pip install then I get the following error

错误:无效的要求:'notebook = 4.2.3'提示:=无效操作员.你是说==吗?

ERROR: Invalid requirement: 'notebook=4.2.3' Hint: = is not a valid operator. Did you mean == ?

推荐答案

该版本的软件包在官方存储库中不可用，因此您必须从其他地方安装它.幸运的是，这可以在 conda-forge 用户维护的存储库中找到.如果您信任软件包的维护者，则只需执行以下操作即可:

That version of the package is not available in the official repositories, so you have to install it from somewhere else. Luckily, this is available in the conda-forge user-maintained repositories. If you trust the maintainer of the package, you can simply do:

conda install -c conda-forge -y notebook=4.2.3

编辑

根据@merv注释，也有可能通过

EDIT

As per @merv comment, it may also be possible to get this package by restoring the free channel searching, which can be done essentially by setting to 1 the CONDA_RESTORE_FREE_CHANNEL environment variable:

CONDA_RESTORE_FREE_CHANNEL=1 conda install -y notebook=4.2.3

或通过将相应的配置标志设置为 true :

or by setting the corresponding config flag to true:

conda config --set restore_free_channel true

---

就 pip 命令而言，这只是一个错字(如错误消息中所建议):将 = 替换为 == 应该可以解决问题:

---

As far as the pip command is concerned, this is simply a typo (as suggested in the error message): replacing = with == should do the trick:

pip install notebook==4.2.3

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