Ever since Hynek recommended it, I've been trying to use the uv packaging tool. While the uv docs are excellent (including guides and integration guides), there's a missing part in my opinion: how do you migrate from existing tooling? There's no guide to migrate from Poetry or PDM, for example …

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Over the years, the urllib3 HTTP client maintained its SSL cipher suites based on Hynek's evergreen list. However, with the release of urllib3 version 2.0, we decided to require OpenSSL 1.1.1 or above and rely on the default cipher suites, which are secure starting with OpenSSL 1 …

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urllib3 is a HTTP client written in Python. We just got 7 billions downloads, 1 million GitHub repositories depend on us, and popular libraries like requests and boto3 use us for performing secure HTTP requests.

We’re currently working on a v2 version that is more modern and secure. It …

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urllib3 is a HTTP client written in Python. We get millions of downloads every day, 500k GitHub repositories depend on us, and popular libraries like requests and boto3 use us for performing secure HTTP requests. In short, urllib3 is Python’s most depended-on HTTP client library.

We’re currently working …

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I spent the last five days working full-time on urllib3, currently the most downloaded Python package, and a dependency of requests. I can’t believe I’m writing this sentence! But it’s true. A dream come true. This was made possible thanks to:

• the urllib3 …

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asyncio has brought support for asynchronous I/O with an event loop to Python 3. Since Python 3.5, we can use the async and await keywords:

async def get(self):
    await self.wait_for_token()
    return self.client.get()

But Python 3.5 also brought support for asynchronous context managers (async …

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If you're coming from a JavaScript background, it's tempting to try to use the promises that you know and love with Python. That's what I tried to initially too, and I was surprised to see that promises were very rarely used in Python. It turns out that promises are not …

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When you first switch away from synchronous sequential code, you realize that you can send hundreds of HTTP requests per second because you don't wait for one request to finish before sending the next one. These requests can be anything, but I focus on HTTP requests in this post because …

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At work, I recently wanted to visualize how we annotated documents that we store as JSON in Elasticsearch. We annotate substrings with different codes, and I wanted to show those codes using colors in a terminal. This basically boils down to outputting JSON with ANSI escape codes. The easier part …

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One of the first hurdles that you can encounter when trying out asyncio is "asyncio eats all my memory!". Indeed, to keep your CPU busy, you're encouraged to launch a lot of coroutines simultaneously. Coroutines don't use a lot of memory by themselves, but what you're doing inside them can …

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