An introduction to zope.interface
This has previously been published on opensource.com.
The Zen of Python is loose enough and contradicts itself enough that you can prove anything from it. Let's meditate upon one of its most famous principles: "Explicit is better than implicit."
One thing that traditionally has been implicit in Python is …read more
Adding Methods Retroactively
Interfaces are forever
(The following talks about zope.interface interfaces, but applies equally well to Java interfaces, Go interfaces, and probably other similar constructs.)
When we write a function, we can sometimes change it in backwards-compatible ways. For example, we can loosen the type of a variable. We can restrict the type of …read more
Analyzing the Stack Overflow Survey
I am the parent of two young kids. It is easy to sink into random stuff, and not follow up on goals. Strict time management and prioritization means I get to work on open source projects, write programming books and update my blog with a decent cadence. Since a lot …read more
Publishing a Book with Sphinx
A Local LRU Cache
"It is a truth universally acknowledged, that a shared state in possession of mutability, must be in want of a bug." -- with apologies to Jane Austen
As Ms. Austen, and Henrik Eichenhardt, taught us, shared mutable state is the root of all evil.
Yet, the official documentation of functools tells …read more
Don't Make It Callable
There is a lot of code that overloads the
This is the method that
an object activates:
something(x, y, z)
something.__call__(x, y, z)
is a member of a Python-defined class.
At first, like every operator overload, this seems like a …read more
Staying Safe with Open Source
A couple of months ago, a successful attack against the Node ecosystem resulted in stealing an undisclosed amount of bitcoins from CoPay wallets.
The technical flow of the attack is well-summarized by the NPM blog post. Quick summary:
- nodemon, a popular way to run Node applications, depends on event-stream.
- The …