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    KDnuggets 500彩票下载app二维码 » News » 2020 » Jan » Tutorials, Overviews » How to Optimize Your Jupyter Notebook ( 20:n05 )

    Gold BlogHow to Optimize Your Jupyter Notebook


     
     

    This article walks through some simple tricks on improving you500彩票下载app二维码r Jupyter Notebook experience, and covers useful shortcuts, adding themes, automatically generated table of contents, and more.



    By , The University of Southampton

    How to optimize you500彩票下载app二维码r Jupyter Notebook

     

    Introduction

     
    Jupyter Notebook is nowadays probably the most used environment for solving Machine Learning/Data Science tasks in Python.

    Jupyter Notebook is a client-server application used for running notebook documents in the browser. Notebook documents are documents able to contain both code and rich text elements such as paragraphs, equations, and so on.

    In this article, I will walk you500彩票下载app二维码 through some simple tricks on how to improve you500彩票下载app二维码r experience with Jupyter Notebook. We will start from useful shortcuts and we will end up adding themes, automatically generated table of contents, and more.

     

    Shortcuts

     
    Shortcuts can be really useful to speed up writing you500彩票下载app二维码r code. I will now walk you500彩票下载app二维码 through some of the shortcuts I found most useful to use in Jupyter.

    There are two possible way to interact with Jupyter Notebook: Command Mode and Edit Mode. Some shortcuts work only on one mode or another while others are common to both modes.

    Some shortcuts which are common in both modes are:

    • Ctrl + Enter: to run all the selected cells
    • Shift + Enter: run the current cell and move the next one
    • Ctrl + s: save notebook

    In order to enter Jupyter command mode, we need to press Esc and then any of the following commands:

    • H: show all the shortcuts available in Jupyter Notebook
    • Shift + Up/Down Arrow: to select multiple notebook cells at the same time (pressing enter after selecting multiple cells will make all of them run!)
    • A: insert a new cell above
    • B: insert a new cell below
    • X: cut the selected cells
    • Z: undo the deletion of a cell
    • Y: change the type of cell to Code
    • M: change the type of cell to Markdown
    • Space: scroll notebook down
    • Shift + Space: scroll notebook up

    In order to enter Jupyter edit mode instead, we need to press Enter and successively any of the following commands:

    • Tab: code competition suggestions
    • Ctrl + ]: indent code
    • Ctrl + [: dedent code
    • Ctrl + z: undo
    • Ctrl + y: redo
    • Ctrl + a: select all
    • Ctrl + 500彩票下载app二维码: move cursor to cell start
    • Ctrl + End: move cursor to the end of the cell
    • Ctrl + Left: move cursor one word left
    • Ctrl + Right: move cursor one word right

     

    Shell commands and Packages installation

     
    Not many users are aware of this, but it is possible to run shell commands in a Jupyter notebook cell by adding an exclamation mark at the beginning of the cell. For example, running a cell with !ls will return all the items in the current working directory. Running a cell with !pwd will instead print out the current directory file-path.

    This same trick can also be applied to install Python packages in Jupyter notebook.

    !pip install numpy


     

    Jupyter Themes

     
    If you500彩票下载app二维码 are interested in changing how you500彩票下载app二维码r Jupyter notebook looks, it is possible to install a package with a collection of different themes. The default Jupyter theme looks like the one in Figure 1. In Figure 2 you500彩票下载app二维码 will see how we will be able to personalise its aspect.

    Figure

    Figure 1: Default Jupyter Notebook Theme

     

    We can install our package directly in the notebook using the trick I showed you500彩票下载app二维码 in the previous section:

    !pip install jupyterthemes


    We can the run the following command to list the names of all the available themes:

    !jt -l
    
    # Cell output:
    # Available Themes: 
    #   chesterish
    #   grade3
    #   gruvboxd
    #   gruvboxl
    #   monokai
    #   oceans16
    #   onedork
    #   solarizedd
    #   solarizedl


    Finally, we can choose a theme using the following command (in this example I decided to use the solarized1 theme):

    !jt -t solarizedl


    Once we've run this command and refreshed the page, our notebook should look like the one in Figure 2.

    Figure

    Figure 2: Solarized1 notebook Theme

     

    In case you500彩票下载app二维码 wish anytime to come back to the original Jupyter notebook theme, you500彩票下载app二维码 can just run the following command and refresh you500彩票下载app二维码r page.

    !jt -r


     

    Jupyter Notebook Extensions

     
    Notebook extensions can be used to enhance the user experience and offer a wide variety of personalization techniques.

    In this example, I will be using the nbextensions library in order to install all the necessary widgets (this time I suggest you500彩票下载app二维码 to first install the packages through terminal and then open the Jupyter notebook). This library makes use of different Javascript models in order to enrich the notebook frontend.

    ! pip install jupyter_contrib_nbextensions
    ! jupyter contrib nbextension install --system


    Once nbextensions is installed you500彩票下载app二维码 will notice that there is an extra tab on you500彩票下载app二维码r Jupyter notebook 500彩票下载app二维码page (Figure 3).

    Figure

    Figure 3: Adding nbextensions to Jupyter notebook

     

    By clicking on the Nbextensions tab, we will be provided with a list of available widgets. In my case, I decided to enable the ones shown in Figure 4.

    Figure

    Figure 4: nbextensions widgets options

     

    Some of my favourite extensions are:

     
    1. Table of Contents

    Auto-generate a table of contents from markdown headings (Figure 5).

    Figure

    Figure 5: Table of Contents

     

     
    2. Snippets

    Sample codes to load common libraries and create sample plots which you500彩票下载app二维码 can use as a starting point for you500彩票下载app二维码r data analysis (Figure 6).

    Figure

    Figure 6: Snippets

     

     
    3. Hinterland

    Code autocompletion for Jupyter Notebooks (Figure 7).

    Figure

    Figure 7: Code autocompletion

     

    The nbextensions library provides many other extensions apart for these three, so I encourage you500彩票下载app二维码 to experiment and test any other which can be of interest for you500彩票下载app二维码!

     

    Markdown Options

     
    By default, the last output in a Jupyter Notebook cell is the only one that gets printed. If instead we want to automatically print all the commands without having to use print(), we can add the following lines of code at the beginning of the notebook.

    from IPython.core.interactiveshell import InteractiveShell
    InteractiveShell.ast_node_interactivity = "all"


    Additionally, it is possible to write LaTex in a Markdown cell by enclosing the text between dollar signs ($).

     

    Notebook Slides

     
    It is possible to create a slideshow presentation of a Jupyter Notebook by going to View -> Cell Toolbar -> Slideshow and then selecting the slides configuration for each cell in the notebook.

    Finally, by going to the terminal and typing the following commands the slideshow will be created.

    pip install jupyter_contrib_nbextensions
    
    # and successively:
    
    jupyter nbconvert my_notebook_name.ipynb --to slides --post serve


     

    Magic

     
    Magics are commands which can be used to perform specific commands. Some examples are: inline plotting, printing the execution time of a cell, printing the memory consumption of running a cell, and so on.

    Magic commands which start with just one % apply their functionality just for one single line of a cell (where the command is placed). Magic commands which instead start with two %% are applied to the whole cell.

    It is possible to print out all the available magic commands by using the following command:

    %lsmagic


     

    Contact info

     
    If you500彩票下载app二维码 want to keep updated with my latest articles and projects and subscribe to my . These are some of my contact details:

     
    Bio: is a final year MSc Artificial Intelligence student at The University of Southampton. He is an AI Enthusiast, Data Scientist and RPA Developer.

    . Reposted with permission.

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