Archives for the ‘Programming’ Category

QListView not accepting drag and drop

Python + Qt (in the form of PyQt5 or PySide2) is a weird mash-up of the famously slow interpreted dynamic language plus a heavyweight C++ GUI library. It certainly has its advantages over writing in C++, but I’m really wondering if there aren’t better ways to write cross-platform desktop apps. Anyways, in Qt, you’re supposed […]

100% Unbreakable Encryption is Achievable!

There were two common cryptography misconceptions that we unlearned in school, and this post is about the first one we learned about. (And Cryptonomicon helped with this one too.) We hear a lot about how “strong” encryption is. That our files would take bazillion years to decrypt via brute force or that our Bitcoin account […]

`git add -p` has made me a better programmer

If you don’t know about this already, then file it under your collection of “One Simple Trick articles”… git add -p (AKA git add –patch) will interactively show you each change in your repo and ask you if you want to stage it. Do you ever use git commit –all? Have you ever accidentally committed […]

Things even veteran developers do

It can feel overwhelming to be a new software engineer, but many “noob” things are actually “everybody” things. If any of these things happen to you, know that you’re in good company! Forget basic syntax and need to Google it Here’s what my recent search history looks like…

The emperor’s new clothes were built with Node.js

There are plenty of people lambasting Node.js (see the infamous “Node.js is cancer”) but proponents tend to misunderstand the message and come up with irrelevant counterpoints. It’s made worse because there are two very different classes of people that use Node.js. The first kind of people are those who need highly concurrent servers that can […]

OpenStreetMap provider CloudMade shuts its doors on small users

(Original email at bottom.) CloudMade, a company selling mapping services (many based on OpenStreetMap data) that competed head-to-head with Google, let its users know that as of May 1st, they’ll stop serving anyone who’s not on an enterprise plan. This is rather sad, because they were one of the main alternatives for custom OpenStreetMap tiles. […]

Good things happen when you subtract datetimes in MySQL

Of course, you know that “good things” and “MySQL” don’t go together. File this one under the category of “small ways in which MySQL is broken”. Let’s fire up MySQL 5.1.72-2-log or 5.5.34-log. [code]mysql> create temporary table blah -> (alpha datetime, beta datetime); Query OK, 0 rows affected (0.01 sec) mysql> describe blah; +——-+———-+——+—–+———+——-+ | […]

tuntuntun – Combine Multiple Internet Connections Into One

GitHub repo: https://github.com/erjiang/tuntuntun (proof of concept status) I was trying to play Minecraft by tethering over a Sprint data connection but was having awful random latency and dropped packets. The Sprint hotspot seems to only allow a limited number of connections to utilize the bandwidth at a time – a download in Chrome would sometimes […]

Googling for bugs: hundreds of date-formatting mistakes

Here’s something really easy to screw up: [php] <?php echo date("Y-m-d H:m:s"); ?> [/php] Spot the mistake? The “m” format code can only mean one thing, which is “months”, not “minutes”. Yet, when you’re writing code in a hurry, it’s so easy to quickly write this code and assume it works. After all, it raises […]

PHP’s wonderful pseudo-functions

There is a pseudo-function in PHP called empty, that tells you whether a variable is “empty” for someone’s definition of empty. The empty string, zero, null, and undefined variables are all considered to be empty. [php] <?php $x = null; echo empty($x); // prints "1" echo empty($nothere); // prints "1" [/php] Well, how did they […]