Python在Jupyter Notebook中看不到软件包 [英] Python doesn't see packages with Jupyter Notebook

问题描述

我在虚拟环境中使用Jupyter Notebook. 我安装了一个依赖项，但是无法导入它:

I use Jupyter Notebook with a virtual environment. I have a dependency installed, but can't import it:

单元格1:
!pip3 install sent2vec

cell 1:
!pip3 install sent2vec

Requirement already satisfied: sent2vec in 
venv/lib/python3.7/site-packages (0.0.0)

单元格2:
import sent2vec

cell 2:
import sent2vec

ModuleNotFoundError                       Traceback (most recent call last)
<ipython-input-5-06231d291a17> in <module>
----> 1 import sent2vec

ModuleNotFoundError: No module named 'sent2vec'

这怎么可能发生?该如何解决?

How this can happen? How to fix this?

> pip3 list
Package      Version  
------------ ---------
certifi      2019.9.11
chardet      3.0.4    
Cython       0.29.14  
idna         2.8      
joblib       0.14.0   
langdetect   1.0.7    
nltk         3.4.4    
numpy        1.17.1   
pip          19.3.1   
requests     2.22.0   
scikit-learn 0.21.3   
scipy        1.3.2    
sent2vec     0.0.0    
setuptools   41.6.0   
six          1.13.0   
urllib3      1.25.7   
wheel        0.33.6

推荐答案

您会注意到，已安装的软件包中未列出jupyter.这意味着您是在其他虚拟环境中运行它.正如我在回答您的问题的评论中提到的那样，您可以运行which jupyter来查找正在运行Jupyter Notebook应用程序的位置(假设您使用的是* NIX系统)；在这种情况下，它将不会出现在第一个代码块中显示的python3.7虚拟环境中.

You'll note that jupyter is not listed in your installed packages. That means you're running it from a different virtual environment. As I mentioned in the comment responding to your question, you can run which jupyter to find out where your Jupyter Notebook application is being run from (assuming you're on a *NIX system); in this case, it won't be from the python3.7 virtual environment that shows up in your first code block.

要解决此问题，只需运行pip3 install jupyter，然后重试运行jupyter notebook.

To resolve the issue, you simply need to run pip3 install jupyter, then retry running jupyter notebook.

或者，您可以将虚拟环境添加为内核，以便在从原始环境运行Jupyter时可以选择它.为此，您将运行(假设pip已连接到您的原始环境):

Alternatively, you can add your virtual environment as a kernel so that it can be selected when you're running Jupyter from your original environment. To do this, you would run (assuming pip is connected to your original environment):

pip install ipykernel
ipython kernel install --user --name=<insert name of your venv>

然后，您应该能够在新笔记本上选择该venv作为内核. (有关Jupyter中venv激活的信息，来源).

You should then be able to select that venv as a kernel on new notebooks. (Source for info on venv activation in Jupyter).

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