Python as a DSL
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
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
X Why Zip
Nitpicks are for Robots
My Little Subclass: Inheritance is Magic
Learning about Python Method Resolution Order with Twilight Sparkle and her friends.
(Thanks to Ashwini Oruganti for her helpful suggestions.)
The show "My Little Pony: Friendship is Magic" is the latest reimagination of the "My Little Pony" brand as a TV show. The show takes place, mostly, in Ponyville and …read more
PYTHONPATH Considered Harmful
(Thanks to Tim D. Smith and Augie Fackler for reviewing a draft. Any mistakes that remain are mine.)
The environment variable
PYTHONPATH seems harmless enough.
The official documentation refers to its function as
"Augment the default search path for module files."
However, in practice, setting this variable in a shell …
Shipping Python Applications in Docker
When looking in open source examples, or tutorials, one will often see Dockerfiles that look like this:
FROM python:3.6 COPY setup.py /mypackage COPY src /mypackage/src COPY requirements.txt / RUN pip install -r /requirements.txt RUN pip install /mypackage ENTRYPOINT ["/usr/bin/mypackage-console-script", "some", "arguments"]