A Zoomable Interactive Python Thread Visualization David M Beazley ( http://www.dabeaz.com ) 512 I/O Bound Threads Running on 2 CPUs (Amazon EC2, Linux) On February 11, 2010, I launched a single large EC2 instance running a custom HTTP server written entirely in Python. That server launched a pool 512 execution threads running inside a version of the interpreter modified to record thread and GIL traces. I then used Twitter and my blog to ask Python programmers to launch an all out assault on the server with

Python, for beginners

# Latency in Asynchronous Python May 24, 2020 nullprogram.com/blog/2020/05/24/ This week I was debugging a misbehaving Python program that makes significant use of Python’s asyncio . The program would eventually take very long periods of time to respond to network requests. My first suspicion was a CPU-heavy coroutine hogging the thread, preventing the socket coroutines from running, but an inspection with pdb showed this wasn’t the case. Instead, the program’s author had made a couple of fundamental

Back in 2007 Python added Abstract Base Classes, which were intended to be used as interfaces: fromabc import ABC classAbstractIterable(ABC): @abstractmethod def__iter__(self): while False: yield None defget_iterator(self): return self.__iter__() ABCs were added to strengthen the duck typing a little. If you inherited AbstractIterable, then everybody knew you had an implemented __iter__ method, and could handle that appropriately. Unsurprisingly, this idea never caught on. People instead prefered “better

In this tutorial, we will show you how to use for-in-loop to loop a List in Python

Invoke another Inngest function from within a Python step and wait for its return value. Reference for the invoke() method, parameters, and return type

Home weblog 2026 07 02 Python Leiden (NL) meetup summaries Python Leiden (NL) meetup summaries ¶ Tags: python , pun Two summaries of the July 2 2026 Python meetup in Leiden . I’ve omitted one, “Python with Karel” by EiEi Tun, as I’ve made a summary of that talk in Utrecht a month ago, already :-) Building modern internal team CLIs with incremental automation - Farid Nouri Neshat ¶ Toil: manual, repetitive, automatable, distracting you from your real work, no enduring value. Yes, he likes to

Staring at the C I'm a systems software engineer living in Manchester, England. Recent Posts: All Posts [Theme modified from Strange Case .] Testing a C Library With Python # Dec 22, 2021 It’s still common for a systems library to be written in the default lingua franca, C, although Rust is encroaching, for good reasons. However, when it comes to testing, things get tedious quickly: writing unit or component tests in C is a slow, bug-prone exercise. With libvfio-user , after fixing too many bugs that were

The [LocatorAssertions] class provides assertion methods that can be used to make assertions about the [Locator] state in the tests.

Data science is increasingly commonplace in industry and the enterprise. Industrial data scientists have a vast toolbox for descriptive and predictive analyses at their disposal. However, data science tools for decision-making in industry and the enterprise are less well established. Here we survey Python packages that can aid industrial data scientists facilitate intelligent decision-making through causality modelling