Shhh, Meet Me at Midnight!!! (Audio Steganography in Python) The term ‘Audio Steganography’ is derived from the Greek words steganos, meaning “covered,” and graphein, meaning “to write”. It refers to the art of enabling secret communication that uses interesting methods to hide information in plain sight. In this talk we’ll walk through how to send secret messages in music or audio recordings using Python! We’ll understand how computers store things as bytes and how knowing this can lead you to possibly win over the love of your life. Marlene is a Zimbabwean software engineer, explorer, and speaker based in the city of Harare. She is a director and vice-chair for the Python Software Foundation and is currently working as a Developer Advocate at Voltron Data. In 2017, she co-founded ZimboPy, a non-profit organization that gives Zimbabwean young women access to resources in the field of technology. She is also the previous chair of PyCon Africa and is an advocate for women in tech on the continent.

How to look for one image inside another image, fast! You know about regular expressions and string matching? Well, what about image matching? How would you look for images inside other images? One way that you might do it is to loop through each position in image A and at each of those positions, check how much the area around it looks like image B, so you can build a ‘heat map’ of which regions of image A look like image B. But that’s really slow if image B is more than a few pixels big, since you need to do (number of pixels in A) * (number of pixels in B) iterations… I was trying to do this for a new project/interface experiment – a daemon that continuously watches your screen for image patterns that you tell it to look for – and I found out that this task is called template matching, and you can do it way faster. The OpenCV library can do this all in tens of milliseconds, as opposed to the several seconds that the nested-loop approach took for me. So I wanted to know how OpenCV does it, and how I could get rid of the dependency and do it myself! We’ll talk about Apple’s Accelerate library, convolution, the Fourier transform, summed-area tables, and why you need to use doubles sometimes instead of floats, among other things. In the end, I got to make the same jump, from seconds down to milliseconds (arguably, I’m even faster than OpenCV now, at least for what i want to do!) – and the whole thing is basically one self-contained C file. Omar is interested in new ways to interact with (and program) computers. He previously worked as a researcher at Dynamicland; he’s also the creator of TabFS, Screenotate, Breakout-in-a-PDF, and a variety of other strange computer projects.

La-La-Lambda Calculus: A Functional Musical Journey! The lambda calculus is a logical formalism that lets us represent programs - all their logic and data - as nothing but pure, anonymous, single-parameter functions. Numbers, operators, booleans, control flow, data structures… any way you want it, lambda functions can do it! In this musical talk we’ll sing the praises of the lambda as we take a quirky, nerdy journey toward a deeper understanding & admiration of the computational power of this elegant, powerful abstraction at the heart of functional programming. Anjana suffers from a chronic case of curiosity, which led her from philosophy to English teaching to computational linguistics to software development. As an engineer & educator, these days she mostly codes & teaches from her home base in San Francisco, when not traveling (in a mask) to events around the world to speak about the joy of programming and advocate for a more equitable & ethical tech industry. Nerd out with her about functional programming & JavaScript, ask her about the Recurse Center & Outreachy, and definitely invite her to your karaoke party!

Sumana Harihareswara is an open source contributor and leader who has contributed to pip, GNOME, MediaWiki, Dreamwidth, GNU Mailman, and other open source projects – and is working on a book to teach what she’s learned along the way. She has keynoted LibrePlanet and other open source conventions, spoken at PyCon and OSCON, performed standup comedy and theater at several tech conferences, and manages and maintains open source projects as Changeset Consulting. Her work has earned her an Open Source Citizen Award and a Google Open Source Peer Bonus. She lives in New York City and microblogs in the Fediverse and on Twitter.

You Kiss Your Computer With That Mouth?! This is a talk about talking - to your computer, out loud, with your mouth, and why a game in this format feels emotionally like an old school exploration RPG. Nicole He is a game developer and creative technologist based in Brooklyn, making unconventional voice technology projects and videogames. She previously worked as a creative technologist at Google Creative Lab and an outreach lead at Kickstarter, and currently teaches at NYU ITP.

Building A Better Tech Future!! Today’s dominant tech companies were built on values of equality and empowerment that don’t ring true anymore. There is a new technology ecosystem trying to emerge, fueled by the fault lines exposed in the mainstream industry, and it needs active nurturing to reach its full potential. In this talk, Aniyia shares 5 rules for building the future along with some questions to consider as we shape new ecosystems and economies. Aniyia Williams is a systempreneur, creator, inventor, tech changemaker, and investor. She is a principal on the Responsible Technology team at Omidyar Network, empowering people to help the tech world live up to its promise of changing lives for the better. Aniyia is also co-founder of Zebras Unite, founder and board chair of Black & Brown Founders, co-convener of the Black Innovation Alliance, and previously founded the fashion tech company Tinsel.

Let’s code in our mother tongue! The story behind the design and implementation of an African native language-based programming language. I am an android engineer with 5 years of experience building applications serving over a million users across various industries. As an engineer I am driven by impact and I care deeply about how my work affects users. When I’m not hanging around my computer keyboard, I enjoy spending some time on my piano keyboard. I love keyboards in any form.

Taperipper or, Oops! All SCSI! One catgirls venture from a neat idea down the rabbit hole of a not-so legacy protocol, learning more than she bargained for, all in the quest for a joke. Aki is a low-level developer with a primary focus on C++ but she is interested in the whole stack, from software to silicon and does hardware design and electrical engineering in her free time.