#282: Don't Embarrass Me in Front of The Wizards
Published Tue, May 3, 2022, recorded Tue, May 3, 2022
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Brian #1: pyscript
- Python in the browser, from Anaconda. repo here
- Announced at PyConUS
- PyScript is built on Pyodide, which is a port of CPython based on WebAssembly.
- Demos are cool.
- Note included in README: “This is an extremely experimental project, so expect things to break!”
Michael #2: Memray from Bloomberg
- Memray is a memory profiler for Python.
- It can track memory allocations in
- Python code
- native extension modules
- the Python interpreter itself
- Works both via CLI and focused app calls
- Memray can help with the following problems:
- Analyze allocations in applications to help discover the cause of high memory usage.
- Find memory leaks.
- Find hotspots in code which cause a lot of allocations.
- Notable features:
- 🕵️♀️ Traces every function call so it can accurately represent the call stack, unlike sampling profilers.
- ℭ Also handles native calls in C/C++ libraries so the entire call stack is present in the results.
- 🏎 Blazing fast! Profiling causes minimal slowdown in the application. Tracking native code is somewhat slower, but this can be enabled or disabled on demand.
- 📈 It can generate various reports about the collected memory usage data, like flame graphs.
- 🧵 Works with Python threads.
- 👽🧵 Works with native-threads (e.g. C++ threads in native extensions)
- Has a live view in the terminal.
- Linux only
Brian #3: pytest-parallel
- I’ve often sped up tests that can be run in parallel by using -n from pytest-xdist.
- I was recommending this to someone on Twitter, and Bruno Oliviera suggested a couple of alternatives. One was pytest-parallel, so I gave it a try.
- pytest-xdist runs using multiprocessing
- pytest-parallel uses both multiprocessing and multithreading.
- This is especially useful for test suites containing threadsafe tests. That is, mostly, pure software tests.
- Lots of unit tests are like this. System tests are often not.
--workersflag for multiple processors,
--workers autoworks great.
--tesst-per-worker autolet’s it pick.
- Very cool alternative to xdist. -
Michael #4: Pooch: A friend for data files
- via via Matthew Fieckert
- Just want to download a file without messing with
- Who is it for? Scientists/researchers/developers looking to simply download a file.
- Pooch makes it easy to download a file (one function call). On top of that, it also comes with some bonus features:
- Download and cache your data files locally (so it’s only downloaded once).
- Make sure everyone running the code has the same version of the data files by verifying cryptographic hashes.
- Multiple download protocols HTTP/FTP/SFTP and basic authentication.
- Download from Digital Object Identifiers (DOIs) issued by repositories like figshare and Zenodo.
- Built-in utilities to unzip/decompress files upon download
file_path = pooch.retrieve(url)