无法使用 conda 卸载旧版本的“matplotlib”

Question

免责声明：我不是技术人员/Python 开发人员，但我正在努力学习它并利用 Jupyter notebook 中的 EDA 来解决机器学习问题

团队 - 找到 conda 卸载错误消息的摘录，尽管它显示已安装多个 matplotlib 版本。我遇到包不可用（如果我卸载最新版本 3.3.2）或安装后我无法使用它 Jupyter notebook。

C:\WINDOWS\system32>conda search matplotlib

Loading channels: done
# Name                       Version           Build  Channel
matplotlib                     1.1.1      np16py27_2  repository/conda_gold_group
matplotlib                     1.2.0      np16py27_0  repository/conda_gold_group
matplotlib                     1.2.0      np16py27_1  repository/conda_gold_group
matplotlib                     1.2.0      np17py27_1  repository/conda_gold_group
matplotlib                     1.2.1      np17py27_0  repository/conda_gold_group
matplotlib                     1.2.1      np17py27_1  repository/conda_gold_group
matplotlib                     1.3.0      np17py27_0  repository/conda_gold_group
matplotlib                     1.3.1      np17py27_0  repository/conda_gold_group
matplotlib                     1.3.1      np17py27_1  repository/conda_gold_group
matplotlib                     1.3.1      np18py27_1  repository/conda_gold_group
matplotlib                     1.3.1      np18py27_2  repository/conda_gold_group
matplotlib                     1.4.0      np18py27_0  repository/conda_gold_group
matplotlib                     1.4.0      np19py27_0  repository/conda_gold_group
matplotlib                     1.4.1      np19py27_0  repository/conda_gold_group
matplotlib                     1.4.2      np19py27_0  repository/conda_gold_group
matplotlib                     1.4.3     np110py27_1  repository/conda_gold_group
matplotlib                     1.4.3     np110py27_2  repository/conda_gold_group
matplotlib                     1.4.3     np110py27_3  repository/conda_gold_group
matplotlib                     1.4.3      np19py27_0  repository/conda_gold_group
matplotlib                     1.4.3      np19py27_1  repository/conda_gold_group
matplotlib                     1.4.3      np19py27_3  repository/conda_gold_group
matplotlib                     1.5.0     np110py27_0  repository/conda_gold_group
matplotlib                     1.5.1     np110py27_0  repository/conda_gold_group
matplotlib                     1.5.1     np111py27_0  repository/conda_gold_group
matplotlib                     1.5.3     np111py27_0  repository/conda_gold_group
matplotlib                     1.5.3     np111py27_1  repository/conda_gold_group
matplotlib                     1.5.3     np111py36_1  repository/conda_gold_group
matplotlib                     2.0.0     np111py27_0  repository/conda_gold_group
matplotlib                     2.0.0     np111py36_0  repository/conda_gold_group
matplotlib                     2.0.0     np112py27_0  repository/conda_gold_group
matplotlib                     2.0.0     np112py36_0  repository/conda_gold_group
matplotlib                     2.0.1     np111py27_0  repository/conda_gold_group
matplotlib                     2.0.1     np111py36_0  repository/conda_gold_group
matplotlib                     2.0.1     np112py27_0  repository/conda_gold_group
matplotlib                     2.0.1     np112py36_0  repository/conda_gold_group
matplotlib                     2.0.2     np111py27_0  repository/conda_gold_group
matplotlib                     2.0.2     np111py36_0  repository/conda_gold_group
matplotlib                     2.0.2     np112py27_0  repository/conda_gold_group
matplotlib                     2.0.2     np112py36_0  repository/conda_gold_group
matplotlib                     2.0.2     np113py27_0  repository/conda_gold_group
matplotlib                     2.0.2     np113py36_0  repository/conda_gold_group
matplotlib                     2.0.2  py27hd2e917d_1  repository/conda_gold_group
matplotlib                     2.0.2  py36h58ba717_1  repository/conda_gold_group
matplotlib                     2.1.0  py27h86412ea_0  repository/conda_gold_group
matplotlib                     2.1.0  py36h11b4b9c_0  repository/conda_gold_group
matplotlib                     2.1.1  py27h3be7b3c_0  repository/conda_gold_group
matplotlib                     2.1.1  py36h2062329_0  repository/conda_gold_group
matplotlib                     2.1.2  py27ha51faf0_0  repository/conda_gold_group
matplotlib                     2.1.2  py36h016c42a_0  repository/conda_gold_group
matplotlib                     2.2.0  py27hf8772e1_0  repository/conda_gold_group
matplotlib                     2.2.0  py36h4dabdea_0  repository/conda_gold_group
matplotlib                     2.2.2  py27h8803d4e_0  repository/conda_gold_group
matplotlib                     2.2.2  py27h8803d4e_1  repository/conda_gold_group
matplotlib                     2.2.2  py36h153e9ff_0  repository/conda_gold_group
matplotlib                     2.2.2  py36h153e9ff_1  repository/conda_gold_group
matplotlib                     3.0.3          py36_0  repository/conda_gold_group
matplotlib                     3.3.2  py36h9f0ad1d_1  repository/conda_gold_group

C:\WINDOWS\system32>conda uninstall matplotlib
Collecting package metadata: done
Solving environment: failed

PackagesNotFoundError: The following packages are missing from the target environment:
  - matplotlib

Answer 1

打开你的cmd并使用命令conda remove package_name --yes
或者如果您不熟悉环境，请使用conda remove -n Environment package_name --yes

来源：
https://docs.conda.io/projects/conda/en/latest/user-guide/tasks/manage-pkgs.html#removing-packages https://docs.conda.io/projects/conda/en/latest/commands/remove.html

Answer 2

虽然它显示安装了多个 matplotlib 版本

你误会了conda search 所做的事情。它只向您显示您可以安装的所有版本，即可以从您的操作系统配置的渠道获得哪些版本，这在某种程度上相当于使用 anaconda.org 上的搜索功能。

您正在考虑的命令是conda list (docs)，它显示了当前正在安装的软件包的列表。

所以你目前可能没有安装 matplotlib，因为你的卸载命令产生了

PackagesNotFoundError: The following packages are missing from the target environment:
  - matplotlib

现在您可以简单地安装您需要的版本，即对于 2.12，只需这样做

conda install matplotlib=2.12

或您可能需要的任何其他版本