$7.11 in four prices and the Decimal type, revisited

I happen to take a look to this old post in this blog. The post is 7 years old, but still presents an interesting problem. “A mathematician purchased four items in a grocery store. He noticed that when he added the prices of the four items, the sum came to $7.11, and when he multiplied the prices of the four items, the product came to $7.11.” I wanted to check my old solutions again, with the things that I learn in the last years. At that time, I was still a newbie in… Read More

ffind v1.0.2 released!

The new version of ffind (1.0.2) is available in GitHub and PyPi. This version includes the ability to execute python modules and scripts directly and some other minor improvements. Happy developing!

Happy 25th Anniversary, Python

25 years ago, on 20th February 1991, Python 0.9.0 was released publicly… I absolutely love it and use it everyday, and it seems to be as successful as ever… For another great 25 years! Cheers!  

Do not spawn processes on users requests

I’ve been playing recently an online game that has recently launched, that uses the following idea. When a user starts a match, it spawns a process in the server that acts as the opponent, generating the actions against the user. The game had a rough launch, with a lot of problems due it being played by a lot of people. And, IMHO, a lot of the problems can be traced to that idea. I see it’s a seductive one. If a user generates an interaction with the service that takes time (for example, a match for… Read More

All you need is cache

What is cache More than a formal definition, I think that the best way of thinking about cache is an result from an operation (data) that gets saved (cached) for future use. The cache value should be identifiable with a key that is reasonably small. This normally is the call name and the parameters, in some sort of hashed way. A proper cache has the following three properties: The result is always replicable. The value can be scrapped without remorse. Obtaining the result from cache is faster than generate it. The same result will be used… Read More

Gorgon: A simple task multiplier analysis tool (e.g. loadtesting)

Load testing is something very important in my job. I spend a decent amount of time checking how performant are some systems. There are some good tools out there (I’ve used Tsung extensively, and ab is brilliant for small checks), but I found that it’s difficult to create flows, where you produce several requests in succession and the input depends on the returned values of previous calls. Also, normally load test tools are focused in HTTP requests, which is fine most of the time, but sometimes is limiting. So, I got the idea… Read More

Compendium of Wondrous Links vol X

More interesting reads worth checking out Tech Use Python on AWS Lambda instead of JavaScript. Create Escher like images using Julia. BeeWares, a collection of tools to help in all the phases of Python development Crete project templates with Cookie Cutter. An interactive Maze Solver. About development I’ve still confused with this “learning code is cool”, as this article says. I’m not sure if this is a bad time to be a beginner.  Yes, it’s true that too many options is confusing, but the amount and quality of instructional material at the moment is… Read More

Leonardo numbers

Because Fibonacci numbers are quite abused in programming, a similar concept. My first impulse is to describe them in recursive way: But this is not very efficient to calculate them, as for each is calculating all the previous ones, recursively. Here memoization works beautifully Taking into account that it uses more memory, and that calculating the Nth element without calculating the previous ones is also costly. I saw this on Programming Praxis, and I like a lot the solution proposed by Graham on the comments, using an iterator. The code is really clean.

Compendium of Wondrous Links vol IX

Welcome back to this totally non-regular compilation of interesting reads. Enjoy! A Pixel Artist Renounces Pixel Art. A module of Python utilities aiming to complement the standard library. Boltons Named Pipes in Unix. Pipes are a really powerful tool. I’m each day more convinced that the biggest problem that an developer faces today is the internal expectations and unfair comparison. Productivity vs Guilt and Self-Loathing.   On secretly Terrible Engineers Curiously enough, in my current job, one of the first things my manager said to me was: “your interview was brilliant, but here’s a… Read More

ffind v0.8 released

Good news everyone! The new version of find (0.8) is available in GitHub and PyPi. This version includes performance improvements, man page and fuzzy search support. Enjoy!