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What is an example of the Liskov Substitution Principle?
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A great example illustrating LSP (given by Uncle Bob in a podcast I heard recently) was how sometimes something that sounds right in natural language doesn't quite work in code.
In mathematics, a Square is a Rectangle. Indeed it is a specialization of a rectangle. ...
How do I check the difference, in seconds, between two dates?
There has to be an easier way to do this. I have objects that want to be refreshed every so often, so I want to record when they were created, check against the current timestamp, and refresh as necessary.
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Crop MP3 to first 30 seconds
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I also recommend ffmpeg, but the command line suggested by John Boker has an unintended side effect: it re-encodes the file to the default bitrate (which is 64 kb/s in the version I have here at least). This might give your customers a false impression of the quality of your sound ...
Multiplication on command line terminal
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Yes, you can use bash's built-in Arithmetic Expansion $(( )) to do some simple maths
$ echo "$((5 * 5))"
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Check the Shell Arithmetic section in the Bash Reference Manual for a complete list of operators.
For sake of com...
How can I get dictionary key as variable directly in Python (not by searching from value)?
Sorry for this basic question but my searches on this are not turning up anything other than how to get a dictionary's key based on its value which I would prefer not to use as I simply want the text/name of the key and am worried that searching by value may end up returning 2 or more keys if the di...
Joining two lists together
If I have two lists of type string (or any other type), what is a quick way of joining the two lists?
15 Answers
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How to compare two colors for similarity/difference
...ith what percentage. The thing is that I don't know how to do that manually step by step. So it is even more difficult to think of a program.
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How to add a new row to an empty numpy array
Using standard Python arrays, I can do the following:
6 Answers
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How do I convert from int to Long in Java?
...ogle people having troubles going from long to int and not the other way around. Yet I'm sure I'm not the only one that has run into this scenario before going from int to Long .
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Retrieving parameters from a URL
Given a URL like the following, how can I parse the value of the query parameters? For example, in this case I want the value of def .
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