# Recent Posts

## Testing Pandoc and Jupyter Notebooks

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Jupyter Notebooks to markdown and html with Pandoc For several months now, the universal document converter pandoc has had support for Jupyter Notebooks. This means that with a single call, you can convert .ipynb files to any of the output formats that Pandoc supports (and vice-versa!). This post is a quick exploration of what this looks like. Note that for this post, were using Pandoc version 2.7.3. Also, some of whats below is hard to interpret without actually opening the files that are created by Pandoc. For the sake of this blog post, Im going to stick with the raw text output here, though you can expand

## What would Python-style governance look like in Jupyter?

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What would Python-style governance look like in Jupyter? This is the second in a series of blog posts that explores what itd look like to directly port the governance model of other communities into the Jupyter project. You can find the first post about Rust here. Note These posts are meant as a thought experiment rather than a proposal. Moreover, all the usual caveats come with it, such as the fact that I dont know the Python governance structure that well, and I might totally botch my characterization of it. Background on Pythons Governance Recently, the Python community underwent a refactoring of their governance model. This was in large

## Exploring xarray - Analyzing iEEG data

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Analyzing intracranial electrophysiology data with xarray Over the last few years, it has been exciting to see the xarray project evolve, add new functionality, and mature. This post is an attempt at giving xarray another visit to see how it could integrate into electrophysiology workflows. A quick background on our data It is common in neuroscience to ask individuals to perform a task over and over again. You record the activity in the brain each time they perform the task (called an epoch or a trial). Time is recorded relative to some onset when the task begins. That is t==0. The result is usually a matrix of

## What would Rust-style governance look like in Jupyter?

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What would Rust-style governance look like in Jupyter? As Ive written about before, I like Rusts governance structure. I mean, who cant get behind a community that lists governance as a top-level page on its website? Jupyter is currently in the middle of figuring out the next phase of its governance structure, and so I have been thinking about what this might look like. This post is a quick thought-experiment to explore what itd mean to port over Rusts governance directly into the Jupyter community. *Note Im not an expert in Rust governance, so there are some assumptions made about its model based on my outside perspective. Apologies if

## Automating Jupyter Book deployments with CI/CD

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Lately Ive spent a lot of time trying to reduce the friction involved in deploying Jupyter Book as well as contributing to the project. Features are a great carrot, but ultimately getting engagement is also about lowering barriers to entry and showing people a path forward. Jupyter Book is a relatively straightforward project, but it involves a few technical pieces that can be painful to use (thanks Jekyll). Recently I experimented with whether we can automate deploying a Jupyter Book online. Using continuous integration deployment services seems like a natural place to try this out. One can upload a barebones set of code to a GitHub repository, then

## A few recent talks

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Lately Ive given quite a number of talks about the Jupyter and Binder ecosystems for various purposes. Before each of the talks, I make the slides available at a public address in case others are interested in following up with the material. For those who missed the talks (or the subsequent tweets about them), here are a few of the more recent ones. A word of warning theres a lot of overlap between these talks - Im not crazy enough to re-invent the wheel each time I have to speak. However, maybe folks will find some value in the different angles taken in each case. The Berkeley

## Thoughts from the Jupyter team meeting 2019

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I just got back from a week-long Jupyter team meeting that was somehow both very tiring and energizing at the same time. In the spirit of openness, Id like to share some of my experience. While its still fresh in my mind, here are a few takeaways that occurred to me throughout the week. Note that these are my personal (rough) impressions, but they shouldnt be taken as a statement from the projectcommunity itself. Jupyter has a huge and diverse set of users The first thing is probably unsurprising to many people, but was really driven home at this meeting, is that there are so many Jupyter

## Three things I love about CircleCI

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I recently had to beef up the continuous deployment of Jupyter Book, and used it as an opportunity to learn a bit more about CircleCIs features. It turns out, theyre pretty cool! Here are a few of the things that I learned this time around. For those who arent familiar with CircleCI, it is a service that runs Continuous Integration and Continuous Deployment (CICD) workflows for projects. This basically means that they manage many kinds of infrastructure that can launch jobs that run test suites, deploy applications, and test on many different environments. Here are some cool things that I now have a much better appreciation for

## Automatically mirror a github repository with CircleCI

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tl;dr you can automatically mirror the contents of one repository to another by using CICD services like CircleCI. This post shows you one way to do it using secrets that let you push to a GitHub repository from a CircleCI process. We recently ran into an issue with the Data 8 course where we needed to mirror one GitHub site to another. In short, the textbook is built with a tool called jupyter-book, and we use github-pages to host the content at inferentialthinking.com. For weird URL-naming reasons, we had to create a second organization to host the actual site. This introduced the complexity that

## Open communities need to be partners, not sources of free labor

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In the last couple of years, weve seen an increasing number of organizations start to spawn products that take a largely open stack (e.g., the SciPy ecosystem) and wrap it in a thin layer of proprietarycustom interface + infrastructure. On the face of it, this isnt a problem - I really want people to be able to make money using the open source stack - however, there is a big caveat. When you look at the work that those organizations have done over time, you often see a pretty thin trail of contributions back to those open source projects. Id argue that using an open communitys software

## My weekly workflow

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Ive had a bunch of conversations with friends who were interested in how to keep track of the various projects theyre working on, and to prioritize their time over the course of a week. I thought it might be helpful to post my own approach to planning time throughout the week in case its useful for others to riff off of. General principles First off, a few general principles that I use to guide my thinking on planning out the week. 1. Be intentional. This seems obvious, but I find that if I dont explicitly define what I want to work on, I have more

## Signaling openness

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How do open projects signal their openness to the outside community? This is a really hard question, particularly because nowadays open has become a buzzword that doesnt just signal a projects position to the community, but is also used as a marketing term to increase support, users, or resources. I was thinking about this the other day, so decided to take to twitter {% twitter httpstwitter.comcholdgrafstatus1054478362209480704 %} I was surprised at how much this question resonated with people. Here are a few highlights from the (very interesting) conversation that came out of that question. Some discussion threads Wishes vs. reality Tal immediately brought up a really important point

## I like Rust's governance structure

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Recently Ive been reading up on governance models for several large-ish open source projects. This is partially because Im involved in a bunch of these projects myself, and partially because its fascinating to see distributed groups of people organizing themselves in effective (or not) ways on the internet. Why is governance in open projects important? Governance is tricky, because there is an inherent tension between * Being able to make important, complex, or sensitive decisions quickly * Being transparent and inclusive in the decision-making process For most companies and organizations, the above is (sort-of) solved with a relatively hierarchical decision-making structure. The Chief Executive Officer can decide high-level directions

## Using CircleCI to preview documentation in Pull Requests

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Writing documentation is important - its the first point of contact between many users and your project, and can be a pivotal moment in whether they decide to adopt your tech or become a contributor. However, it can be a pain to iterate on documentation, as it is often involves a lot of rapid iteration locally, followed by a push to GitHub where you just trust that the author has done a good job of writing content, design, etc. A really helpful tip here is to use Continuous Integration to build and preview your documentation. This allows you to generate a link to the build docs,

## Summer conference report back

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This is a short update on several of the conferences and workshops over the summer of this year. Theres all kinds of exciting things going on in open source and open communities, so this is a quick way for me to collect my thoughts on some things Ive learned this summer. SciPy The Pangeo project demoed their JupyterHub for big-data geoscience Pangeo is a project that provides access to a gigantic geosciences dataset. They use lots of tools in the open-source community, including Dask for efficient numerical computation, the SciPy stack for a bunch of data analytics, and JupyterHub on Kubernetes for managing user instances and deploying on

## Adding copy buttons to code blocks in Sphinx

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NOTE This is now a sphinx extension! Thanks to some friendly suggestions, Ive written > this up as a super tiny sphinx extension. Check it out here httpsgithub.comcholdgrafsphinx-copybutton Sphinx is a fantastic way to build documentation for your Python package. On the Jupyter project, we use it for almost all of our repositories. A common use for Sphinx is to step people through a chunk of code. For example, in the Zero to JupyterHub for Kubernetes guide we step users through a number of installation and configuration steps. A common annoyance is that there is a lot of copypasting involved. Sometimes you accidentally miss a character or some

## Introducing _makeitpop_, a tool to perceptually warp your data!

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Note It should go without saying, but you should never do the stuff that youre about to read about here. Data is meant to speak for itself, and our visualizations should accurately reflect the data above all else. When I was in graduate school, I tended to get on my soapbox and tell everybody why they should stop using Jet and adopt a perceptually-flat colormap like viridis, magma, or inferno. Surprisingly (ok, maybe not so surprisingly) I got a lot of pushback from people. Folks would say _But I like jet, it really highlights my data, it makes the images pop more effectively

## Blogging with Jupyter Notebooks and Jekyll using nbconvert templates

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Heres a quick (and hopefully helpful) post for those wishing to blog in Jekyll using Jupyter notebooks. As some of you may know, nbconvert can easily convert your .ipynb files to markdown, which Jekyll can easily turn into blog posts for you. nbconvert --to markdown myfile.ipynb However, an annoying part of this is that Markdown doesnt include classes for input and outputs, which means they each get treated the same in the output. Not ideal. Fortunately, you can customize nbconvert extensively. First, its possible to create your own exporter class, but this is a bit heavy for what we want to do. In our case, wed simply like to extend

## An academic scientist goes to DevOps Days

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Last week I took a few days to attend DevOpsDays Silicon Valley. My goal was to learn a bit about how the DevOps culture works, what are the things people are excited about and discuss in this community. Im also interested in learning a thing or two that could be brought back into the scientific academic world. Here are a couple of thoughts from the experience. > tl;dr DevOps is more about culture and team process than it is about technology, maybe science should be too… What is DevOps anyway? This one is going to be hard to define (though heres one definition), as Im new

## Combining dates with analysis visualization in python

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Sometimes you want to do two things 1. Plot a timeseries that handles datetimes in a clever way (e.g., with Pandas or Matplotlib) 2. Plot some kind of analysis on top of that timeseries. Sounds simple right? Its not. The reason for this is that plotting libraries dont really plot human-readable dates, they convert dates to numbers, then change the xtick labels so that theyre human readable. This means that if you want to plot something on top of dates, its quite confusing. To demonstrate this, lets grab the latest stock market prices for a couple companies and fit regression lines to them… Lets say we want

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