I invoke \"jupyter notebook\" under:
[abigail@localhost anaconda3]$ jupyter notebook
By default, it saves to the directory of anaconda3/ with
There are two methods:
1.You can use the magic command %notebook to save as ipynb
%notebook "directory/to/file/filename.ipynb"
2.You can use the magic command %%writefile to save as py file
%%writefile "directory/to/file/filename.py"
In the second method, you should put this command at the top of the cell, otherwise it will throw an error.