(This is an adaptation of part of the talk Kurt Rose and I gave at PyBay 2017)
An abstraction cascade is a common anti-pattern in legacy system. It is useful to understand how to recognize it, how it tends to come about, how to fix it -- and most importantly, what …read more
Gather is a plugin framework -- and it now has its own blog.
Use it! If you like it, tell us about it, and if there is a problem, tell us about that.read more
Brute Forcing AES
Thanks to Paul Kehrer for reviewing! Any mistakes or oversights that are left are my responsibility.
AES's maximum key size is 256 bits (there are also 128 and 192 bit versions available). Is that enough? Well, if there is a cryptographic flaw in AES (i.e., a way to recover …read more
Announcing NColony 17.9.0
SSH to EC2
(Thanks to Donald Stufft for reviewing this post, and to Glyph Lefkowitz for inspiring much of it.)
(JP Calderone wrote a Twisted version of this approach.)
It is often the case that after creating an EC2 instance in AWS, the next step is SSHing. This might be because the machine …read more
Python as a DSL
This is a joint post by Mark Williams and Moshe Zadka. You are probably reading it on one of our blogs -- if so, feel free to look at the other blog. We decided it would be fun to write a post together and see how it turns out. We definitely …read more
Image Editing with Jupyter
With the news about MS Paint going away from the default MS install, it might be timely to look at other ways to edit images. The most common edit I need to do is to crop images -- and this is what we will use as an example.
My favorite image …read more
Anatomy of a Multi-Stage Docker Build
Docker, in recent versions, has introduced multi-stage build. This allows separating the build environment from the runtime envrionment much more easily than before.
In order to demonstrate this, we will write a minimal Flask app and run it with Twisted using its WSGI support.
The Flask application itself is the …read more
Bash is Unmaintainable Python
(Thanks to Aahz, Roy Williams, Yarko Tymciurak, and Naomi Ceder for feedback. Any mistakes that remain are mine alone.)
In the post about building Docker applications, I had the following Python script:
import datetime, subprocess tag = datetime.datetime.utcnow().isoformat() tag = tag.replace(':', '-').replace('.', '-') for ext in ['', '-slim']: image = "moshez …read more
Imports at a Distance
(Thanks to Mark Williams for feedback and research)
Imagine the following code:
## mymodule.py import toplevel.nextlevel.lowmodule def _func(): toplevel.nextlevel.lowmodule.dosomething(1) def main(): _func()
does define a function
this code seems to work just fine.
However, imagine that later we …read more