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How do I use itertools.groupby()?
...eturns iterators.
Here's an example of that, using clearer variable names:
from itertools import groupby
things = [("animal", "bear"), ("animal", "duck"), ("plant", "cactus"), ("vehicle", "speed boat"), ("vehicle", "school bus")]
for key, group in groupby(things, lambda x: x[0]):
for thing in ...
C++ Exceptions questions on rethrow of original exception
...Err(const MyErr& other) {
printf(" Base copy-constructor, this=%p from that=%p\n", this, &other);
}
virtual ~MyErr() {
printf(" Base destructor, this=%p\n", this);
}
};
struct MyErrDerived : public MyErr {
MyErrDerived() {
printf(" Derived default constructor, this=%p...
How to make a valid Windows filename from an arbitrary string?
I've got a string like "Foo: Bar" that I want to use as a filename, but on Windows the ":" char isn't allowed in a filename.
...
What is the difference between require and require-dev sections in composer.json?
...ke more sense to commit everything, and for deploy just pull master branch from production using git?
– mbomb007
Apr 17 at 16:16
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Why does Ruby have both private and protected methods?
... the defining class or its subclasses.
private methods can be called only from within the calling object. You cannot access another instance's private methods directly.
Here is a quick practical example:
def compare_to(x)
self.some_method <=> x.some_method
end
some_method cannot be priv...
How to extract an assembly from the GAC?
...
I used the advice from this article to get an assembly from the GAC.
Get DLL Out of The GAC
DLLs once
deployed in GAC (normally located at
c:\windows\assembly) can’t be viewed
or used as a normal DLL file. They
can’t be ...
What's the best way to trim std::string?
...lt;algorithm>
#include <cctype>
#include <locale>
// trim from start (in place)
static inline void ltrim(std::string &s) {
s.erase(s.begin(), std::find_if(s.begin(), s.end(), [](unsigned char ch) {
return !std::isspace(ch);
}));
}
// trim from end (in place)
sta...
Batch files - number of command line arguments
...
Googling a bit gives you the following result from wikibooks:
set argC=0
for %%x in (%*) do Set /A argC+=1
echo %argC%
Seems like cmd.exe has evolved a bit from the old DOS days :)
share
...
Apache Kafka vs Apache Storm
...st queue that can handle high volume data and enables you to pass messages from one end-point to another.
Storm is not a queue. It is a system that has distributed real time processing abilities, meaning you can execute all kind of manipulations on real time data in parallel.
The common flow of th...
What is the canonical way to check for errors using the CUDA runtime API?
...n return either errors which occurred during the kernel execution or those from the memory copy itself. This can be confusing for the beginner, and I would recommend using explicit synchronisation after a kernel launch during debugging to make it easier to understand where problems might be arising....