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Multiprocessing - Pipe vs Queue
...re than two points to communicate, use a Queue().
If you need absolute performance, a Pipe() is much faster because Queue() is built on top of Pipe().
Performance Benchmarking
Let's assume you want to spawn two processes and send messages between them as quickly as possible. These are the timing...
How to find out what type of a Mat object is with Mat::type() in OpenCV
...to help with identifying your opencv matrices at runtime. I find it useful for debugging, at least.
string type2str(int type) {
string r;
uchar depth = type & CV_MAT_DEPTH_MASK;
uchar chans = 1 + (type >> CV_CN_SHIFT);
switch ( depth ) {
case CV_8U: r = "8U"; break;
cas...
How to avoid explicit 'self' in Python?
...stion to remove python from it. I think that it belongs there. (and thanks for the answer!)
– bguiz
Nov 1 '10 at 3:25
3
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python NameError: global name '__file__' is not defined
...le.py from a script, you would put it in the same directory as your script for example. So you need to move to this directory before running file.py... So still something better is sought.
– ztyh
Aug 24 '18 at 17:12
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How to write a large buffer into a binary file in C++, fast?
...
int main()
{
FILE* pFile;
pFile = fopen("file.binary", "wb");
for (unsigned long long j = 0; j < 1024; ++j){
//Some calculations to fill a[]
fwrite(a, 1, size*sizeof(unsigned long long), pFile);
}
fclose(pFile);
return 0;
}
I just timed 8GB in 36sec, whi...
Hashing a dictionary?
For caching purposes I need to generate a cache key from GET arguments which are present in a dict.
11 Answers
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Pythonic way to find maximum value and its index in a list?
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There are many options, for example:
import operator
index, value = max(enumerate(my_list), key=operator.itemgetter(1))
share
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improve this answ...
Do try/catch blocks hurt performance when exceptions are not thrown?
... block. She and an IT representative suggested this can have effects on performance of the code. In fact, they suggested most of the code should be outside of try/catch blocks, and that only important sections should be checked. The Microsoft employee added and said an upcoming white paper warns aga...
How do you run your own code alongside Tkinter's event loop?
My little brother is just getting into programming, and for his Science Fair project, he's doing a simulation of a flock of birds in the sky. He's gotten most of his code written, and it works nicely, but the birds need to move every moment .
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What does pylint's “Too few public methods” message mean
...
+1 for "pylint doesn't know what's best" - use your own judgement but as a rule, if what you need is a "struct", use a dict or namedtuple. Use a class when you want to add some logic to your object (for example, you want stuff t...