Originally published at www.ikriv.com. Please leave any comments there.

I was too busy with my job to post anything here. Besides, for some time I was working on proprietary stuff, so I could not really post about it, and even if I did, it would not be too interesting. Time to give this site a brush-up, update PHP and WordPress as they recommend, ( Read more... )

Originally published at www.ikriv.com. Please leave any comments there.

I was just experimenting with HTML5 canvas. The game is entirely in HTML5/JavaScript, it should work on desktop and on mobile devies. The moves table is pre-generated in C#.

• Play against optimal algorithm
• Play against random algorithm
• Play against human (two humans required)
• Source ( Read more... )

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Coming from C# background, I was trying to understand whether Python allows to pass obj.method where ordinary function is expected, and if yes, how could it possibly work.

Consider this code fragment:

def call_twice(f ( Read more... )

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I stumbled upon an article (https://danluu.com/cli-complexity/), that explores the dramatic growth of the number of command line options in most popular Unix commands between 1979 and 2017 and explains why it may have happened. I found it very interesting and instructive to read ( Read more... )

Originally published at www.ikriv.com. Please leave any comments there.

When I was going to Worldometer’s coronavirus page, it would redirect me to some stupid scam web site saying “you made 5 billionth search”. It happened only one one of my devices, the one given to me by my employeer, and the one I least expected to be infected, since I use it ( Read more... )

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Coming back to the blog after long break.

Today, almost by accident I found how logical operators work with None in Python. The result is surprising, because it is not commutative.

(False or None) is None ( Read more... )

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I have a very nicely built 12 year old Dell tower, that I inherited from some startup, which I use as a home server running Ubuntu. I also have a 7 year old spare CPU and motherboard with some memory on it. The tower was quite high end in its time and is very nicely built: ( Read more... )

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Python has two ways to convert an object to a string: str(x) and repr(x). str is supposed to be user-readable, and repr is more technical, e.g. for debugging purposes.

To my surprise, if I have a list of things, str(list) and repr(list) do the same thing and include a repr of ( Read more... )

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TL;DR:
Python type cast looks like an assertion:

# Python x = expression_returning_Base assert isinstance(x, Derived)
This corresponds to Java or C#

// Java Derived x = (Derived)expression_returning_Base;
In languages like Java and C++, it is a common situation when at runtime ( Read more... )

Originally published at www.ikriv.com. Please leave any comments there.

In bash it is possible to test whether one file is older or newer than the other:

if [ file1 -nt file2 ]; then # do something fi if [ file3 -ot file4 ]; then # do something fi
However, the man page does not say what happens if one of the files does not exist. Experiment shows ( Read more... )