Real Python Podcast Episode #154 Title Artwork

Episode 154: Targeting WebAssembly Platforms & Distilling a Minimum Viable Python

The Real Python Podcast

Apr 28, 2023 1h 19m

Are you familiar with the different versions of WebAssembly? Could WASM be the “write once, run everywhere” solution that developers have searched for? Where does distributing Python applications fit in the narrative? This week on the show, we have CPython core developer Brett Cannon to discuss his recent articles about WebAssembly and MVPy.

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Brett has completed his syntactic sugar series, which we discussed in a previous episode. He details the origin of the series and his process of unearthing a minimum viable version of Python. Brett shares how he updated his PyCon US talk on the subject after feedback from presenting it at PyCascades.

We also dig deep into WebAssembly, specifically WebAssembly System Interface (WASI). Brett explains the concept of a “platform target triple” and the importance of defining which system CPython is compiled for. We also discuss WebAssembly becoming a ubiquitous distribution system.


  • 00:00:00 – Introduction
  • 00:02:05 – PyCascades 2023
  • 00:02:56 – Using social media for polls and checking interest
  • 00:06:02 – Completing the syntactic sugar blog series
  • 00:15:29 – Minimum Viable Python (MVPy) and WebAssembly
  • 00:19:29 – Other teams focusing on WebAssembly
  • 00:21:31 – Sponsor: Courier
  • 00:22:13 – Stack of technology
  • 00:26:50 – WebAssembly and its platform targets
  • 00:32:35 – WASI and connecting to a runtime
  • 00:38:33 – Extension modules and dynamic libraries
  • 00:47:29 – Overcoming road blocks and envisioning a new WASI assignment
  • 00:51:51 – Video Course Spotlight
  • 00:53:26 – PEP 11 & CPython platform support for WASI
  • 01:03:11 – Machine-specific runtime
  • 01:04:57 – Write once, run everywhere
  • 01:13:14 – Talks and summits planned for PyCon 2023
  • 01:18:00 – Thanks and goodbye

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