Python 无法在Virtualenv中运行Jupyter Notebook plus TensorFlow

我已经按照上面描述的步骤进行了操作，并且能够激活

source~/tensorflow/bin/activate

并已安装

（tensorflow）$pip3安装——升级tensorflow

一切都很顺利，我能够运行tensorflowHello World程序

我看了看我当地的jupyter小径

(tensorflow)username$ which jupyter
(tensorflow)username$/Library/Frameworks/Python.framework/Versions/3.6/bin/jupyter

然后我尝试在tensorflow Virtualenv上安装jupyter

(tensorflow) username$ pip3 install jupyter
Requirement already satisfied: jupyter in /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages
Requirement already satisfied: ipywidgets in /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages (from jupyter)
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然后我停用了虚拟环境，重新启动了终端，再次激活了tensorflow。我试图再次检查我在virtualenv上的路径。又得到了同样的东西

(tensorflow)username$ which jupyter
(tensorflow)username$/Library/Frameworks/Python.framework/Versions/3.6/bin/jupyter

我尝试了所有的博客解决方案，包括

pip安装--升级$TF\u BINARY\u URL

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现在，当我在Jupyter notebook中运行Hello World时，我发现有什么问题吗？在Jupyter notebook中没有使用virtualenv时，我在本地安装了tensorflow和keras，现在Jupyter notebook能够定位库。那么，怎么了？在Jupyter notebook中没有使用virtualenv时，我在本地安装了tensorflow和keras，现在jupyter笔记本可以找到图书馆了。