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Why is Python 3.x's super() magic?
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The new magic super() behaviour was added to avoid violating the D.R.Y. (Don't Repeat Yourself) principle, see PEP 3135. Having to explicitly name the class by referencing it as a global is also prone to the same rebinding issues you discovered with super() itself:
class ...
When do you use Java's @Override annotation and why?
What are the best practices for using Java's @Override annotation and why?
27 Answers
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Why does String.valueOf(null) throw a NullPointerException?
...nd applicable to a method invocation, it is necessary to choose one to provide the descriptor for the run-time method dispatch. The Java programming language uses the rule that the most specific method is chosen.
A char[] is-an Object, but not all Object is-a char[]. Therefore, char[] is more spec...
Actual meaning of 'shell=True' in subprocess
... of the user's choosing and is platform-dependent. Generally speaking, avoid invocations via the shell.
Invoking via the shell does allow you to expand environment variables and file globs according to the shell's usual mechanism. On POSIX systems, the shell expands file globs to a list of files....
Emulate ggplot2 default color palette
...65, c = 100)[1:n]
}
For example:
n = 4
cols = gg_color_hue(n)
dev.new(width = 4, height = 4)
plot(1:n, pch = 16, cex = 2, col = cols)
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Is it OK to leave a channel open?
...principle of using Go channels is don't close a channel from the receiver side and don't close a channel if the channel has multiple concurrent senders."
As clearly mentioned in answer above that every channel will be GCed eventually once it is marked for cleanup, so it is okay to leave channel un-...
String formatting in Python 3
...ere's also a way of doing it using a single argument twice (as @Burhan Khalid noted in the comments):
"({0.goals} goals, ${0.penalties})".format(self)
Explaining:
{} means just the next positional argument, with default format;
{0} means the argument with index 0, with default format;
{:d} is t...
Python “raise from” usage
...ed
A similar mechanism works implicitly if an exception is raised inside an exception handler or a finally clause: the previous exception is then attached as the new exception’s __context__ attribute:
>>> try:
... print(1 / 0)
... except:
... raise RuntimeError("Something b...
Size of character ('a') in C/C++
...ence between C and C++ in something I wrote a few years ago, at: http://david.tribble.com/text/cdiffs.htm
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vim command to restructure/force text to 80 columns
I know there are ways to automatically set the width of text in vim using set textwidth (like Vim 80 column layout concerns ). What I am looking for is something similar to = (the indent line command) but to wrap to 80. The use case is sometimes you edit text with textwidth and after joining li...