Self-tutoring about Python: the tutor mentions an error he encountered. I ran across TypeError: ‘str’ obj is not callable in the repl when testing a class. It happened when I tried something like str(Obj), which should work. Yet, it won’t …
Self-tutoring about comp sci: the tutor mentions namespaces and directories. A namespace, from a very broad point of view, is a top-level category under which other entities can be placed. Let’s imagine you have two namespaces, called magnet and cat, …
Self-tutoring about computer use: the tutor mentions the Break key. I read the instruction to stop an app by the combination Ctrl-Break. Trouble is, this computer’s keyboard doesn’t have a Break key. What to do? Apparently, Ctrl-C can accomplish the …
Self-tutoring about Python, but also life: the tutor reflects…. I’ve been working on a second degree the past couple of years. I’m done now, but for a work experience course. I’ll share more about that in coming posts. One language …
Self-tutoring about Python: shallow copy vs deep copy. A deep copy is a new object: if you change its source, the deep copy won’t change. However, if you change the source, a shallow copy will change with it, if the …
Self-tutoring about problem solving: the tutor relates a quick story. We have rechargeable phones for our land line: the set came with four phones and three recharging stations. We bought it years ago. Gradually, the phones started to resist recharging. …
Self-tutoring about people and events from the past: the tutor mentions the mansion. Back in the Annapolis Valley, I didn’t live on the base; we lived in a village near it. Many of the local kids had lived there all …
Self-tutoring about servlets: the tutor mentions an observation. If there’s the slightest mistake in the web.xml file (tomcat server), you might discover that not only the servlets don’t work, but the tomcat server won’t serve anything at all, not even …
Self-tutoring about people and events from the past: the tutor reflects… When I moved to the base on PEI in summer ’76, it started out really fun. As I’ve hinted elsewhere, the air slowly escaped from the balloon, but it …
Self-tutoring about Java: the tutor mentions classpath. It might properly be called CLASSPATH. It’s where Java will search for the class you want it to run. Yet, if you’re running a Java program from the command line after compiling it, …