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Talk Python To Me - #523: Pyrefly: Fast, IDE-friendly typing for Python

Python typing got fast enough to feel invisible. Pyrefly is a new, open source type checker and IDE language server from Meta, written in Rust, with a focus on instant feedback and real-world DX. Today, we will dig into what it is, why it exists, and how it plays with the rest of the typing ecosystem. We have Abby Mitchell, Danny Yang, and Kyle Into from Pyrefly here to dive into the project.

Episode sponsors

Sentry Error Monitoring, Code TALKPYTHON
Agntcy
Talk Python Courses

Links from the show

Abby Mitchell: linkedin.com
Danny Yang: linkedin.com
Kyle Into: linkedin.com

Pyrefly: pyrefly.org
Pyrefly Documentation: pyrefly.org
Pyrefly Installation Guide: pyrefly.org
Pyrefly IDE Guide: pyrefly.org
Pyrefly GitHub Repository: github.com
Pyrefly VS Code Extension: marketplace.visualstudio.com
Introducing Pyrefly: A New Type Checker and IDE Experience for Python: engineering.fb.com
Pyrefly on PyPI: pypi.org
InfoQ Coverage: Meta Pyrefly Python Typechecker: infoq.com
Pyrefly Discord Invite: discord.gg
Python Typing Conformance (GitHub): github.com
Typing Conformance Leaderboard (HTML Preview): htmlpreview.github.io

Watch this episode on YouTube: youtube.com
Episode #523 deep-dive: talkpython.fm/523
Episode transcripts: talkpython.fm

Theme Song: Developer Rap
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Strict Scrutiny - Will SCOTUS Allow Conversion Therapy for Minors?

Leah, Melissa, and Kate are back in business, breaking down this term’s first week of arguments at SCOTUS, including a challenge to Colorado’s ban on conversion therapy for minors. Also covered: the indictment of New York’s Attorney General Letitia James, the continuing legal fights against Trump’s efforts to send the National Guard into Portland and Chicago, and Attorney General Pamela Jo Bondi’s pugnacious testimony before the Senate Judiciary Committee. Then, Kate and Leah speak with Yale Law Professor John Fabian Witt about his book The Radical Fund: How a Band of Visionaries and a Million Dollars Upended America, which chronicles how philanthropist Charles Garland bankrolled progressive causes through his American Fund for Public Service.

  • If you want to learn more about Buck v. Bell (the 1927 case Justice Alito referenced in the Chiles arguments), listen to our deep dive from 2020

Favorite things:

Leah: Protest videos from Portland and Chicago; The Sentimental Garbage podcast on The Life of a Showgirl

Kate: Writers & Lovers by Lily King, Creation Lake by Rachel Kushner; Red Clover Ranch in Wisconsin; wine and cider from Las Mujeres

Melissa: Vision & Justice; Miss Toy Poodle on Instagram

Leah will be in conversation with UCLA Law Professor Rick Hasen at the Hammer Museum in Los Angeles on Tuesday, Oct 14, 2025 at 7:30 PM. Details here.

Order your copy of Leah's book, Lawless: How the Supreme Court Runs on Conservative Grievance, Fringe Theories, and Bad Vibes

Get tickets to CROOKED CON November 6-7 in Washington, D.C at http://crookedcon.com

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What A Day - Trump Is Prosecuting His Enemies

Things have been moving fast since President Donald Trump posted on Truth Social last month QUOTE: "Pam: I have reviewed over 30 statements and posts saying that, essentially, “same old story as last time, all talk, no action. Nothing is being done. What about Comey, Adam “Shifty” Schiff, Leticia??? They’re all guilty as hell, but nothing is going to be done.” Since then, two of the three people Trump mentioned – former FBI director James Comey and New York Attorney General James – have been charged with crimes. Just last week, the Department of Justice indicted James on one count of bank fraud and one count of making a false statement in relation to allegations James lied on a mortgage application. James says the charges amounted to pure lawfare aimed at Trump’s enemies. So, to talk about Trump prosecuting his political enemies, we spoke Rhode Island Attorney General Peter Neronha.

And in headlines, Trump reignites the trade war with China, the Centers for Disease Control and Prevention is trying to rehire hundreds of employees it fired by mistake, and Trump is in Israel to greet hostages held by Hamas upon their release.

Show Notes:


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The Best One Yet - 🏙️ “JamieLand” — JPM’s Return-to-Office Tower. Scoreability’s LinkedIn for Athletes. Walmart’s Store of the Future. +Pumpkin Spice Weddings

JP Morgan Chase’s new skyscraper just opened… including 19 restaurants & custom scents.

Scoreability is LinkedIn of high school athletes… Because college sports is a for-profit growth industry.

Walmart just launched the “Tire Center of the Future”... It’s the omni-channel labradoodle of retail.

The hot new month to get married? October… It’s the pumpkin-spice wedding trend.


$JPM $WMT $AMZN


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What Next - What Next | Daily News and Analysis – Amicus | Dear Justice Kavanaugh, “I’m American, Bro”

While the What Next team celebrates Indigenous Peoples’ Day, please enjoy this episode from our colleagues at Amicus, Slate’s legal podcast. Mary will be back with a new episode of What Next tomorrow.

In this week’s episode of Amicus, we delve into the recent Supreme Court shadow docket order in Noem v. Vasquez-Perdomo, which in essence legalized racial profiling by roving ICE patrols, and in practice may have ushered in America’s “show your papers” era for Americans with brown skin, who speak Spanish, and/or go to Home Depot in work clothes. Join Dahlia Lithwick and Ahilan Arulanantham, a longstanding human rights lawyer and law professor, as they unpack what this unargued, unreasoned, unsigned and (in Kavanaugh’s case) uncited decision means for both immigrants and U.S. citizens, for 4th amendment doctrine, and for the lower courts expected to parse SCOTUS’ tea leaves. 

Want more Amicus? Join Slate Plus to unlock weekly bonus episodes with exclusive legal analysis. Plus, you’ll access ad-free listening across all your favorite Slate podcasts. You can subscribe directly from the Amicus show page on Apple Podcasts and Spotify. Or, visit slate.com/amicusplus to get access wherever you listen.


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Short Wave - Synthetic Cells: The Next Bioengineering Frontier

There are more human cells in your body than there are stars in the Milky Way galaxy! Cells are the fundamental building blocks of life but that doesn’t mean they are simple – biology still doesn’t have a full picture of how exactly a living cell works. Host Regina G. Barber talks with bioengineers Kate Adamala and Drew Endy about why scientists are trying to build a cell from scratch, piece by piece. They dive into what it would look like to be inside of a cell, why scientists are bothering with making a cell from scratch and how engineers are leading the field.


Want more bioengineering stories? Email us at shortwave@npr.org.


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What Next | Daily News and Analysis - Amicus | Dear Justice Kavanaugh, “I’m American, Bro”

While the What Next team celebrates Indigenous Peoples’ Day, please enjoy this episode from our colleagues at Amicus, Slate’s legal podcast. Mary will be back with a new episode of What Next tomorrow.

In this week’s episode of Amicus, we delve into the recent Supreme Court shadow docket order in Noem v. Vasquez-Perdomo, which in essence legalized racial profiling by roving ICE patrols, and in practice may have ushered in America’s “show your papers” era for Americans with brown skin, who speak Spanish, and/or go to Home Depot in work clothes. Join Dahlia Lithwick and Ahilan Arulanantham, a longstanding human rights lawyer and law professor, as they unpack what this unargued, unreasoned, unsigned and (in Kavanaugh’s case) uncited decision means for both immigrants and U.S. citizens, for 4th amendment doctrine, and for the lower courts expected to parse SCOTUS’ tea leaves. 

Want more Amicus? Join Slate Plus to unlock weekly bonus episodes with exclusive legal analysis. Plus, you’ll access ad-free listening across all your favorite Slate podcasts. You can subscribe directly from the Amicus show page on Apple Podcasts and Spotify. Or, visit slate.com/amicusplus to get access wherever you listen.


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NPR's Book of the Day - ‘Pick a Color’ is a novel that takes place over a single day at a nail salon

Ning is the manager of a nail salon where all of the workers wear a nametag with the same name – Susan. Pick A Color takes place over a single day at the salon and it’s the first novel by Souvankham Thammavongsa. In today’s episode, the poet and short story writer speaks with NPR’s Scott Simon about Ning’s background as a prizefighter, what Thammavongsa has observed as a salon customer, and the author’s distinction between knowledge and intelligence.


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Global News Podcast - Relatives of Israeli hostages prepare for their release

Anticipation is growing in Hostages Square in Tel Aviv where families and friends of the remaining Israeli hostages have gathered ahead of their expected release by Hamas after two years of captivity in Gaza. Around twenty of them are thought to still be alive. As part of an exchange Israel will free nearly two-thousand Palestinian prisoners under the terms of the ceasefire deal brokered by the Trump administration. The US president, who is travelling to Israel, has said that he believes the ceasefire in Gaza will hold and that the war is over. Also: the leader of an elite army unit in Madagascar that sided with demonstrators against the president has been sworn in as the chief of the country's armed forces, leading to talk of a possible coup; how the temperature of your nose can determine your stress levels; and the actor, Tom Hollander, tells the BBC that live performance is crucial in fighting the growing use of AI on screen.