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What's the (hidden) cost of Scala's lazy val?
...e of Scala is lazy val , where the evaluation of a val is delayed until it's necessary (at first access).
6 Answers
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Using os.walk() to recursively traverse directories in Python
I want to navigate from the root directory to all other directories within and print the same.
13 Answers
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How to divide flask app into multiple py files?
My flask application currently consists of a single test.py file with multiple routes and the main() route defined. Is there some way I could create a test2.py file that contains routes that were not handled in test.py ?
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Is there a range class in C++11 for use with range based for loops?
I found myself writing this just a bit ago:
8 Answers
8
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How to create the most compact mapping n → isprime(n) up to a limit N?
... there would be a data structure I could query.
I define the best algorithm , to be the algorithm that produces a data structure with lowest memory consumption for the range (1, N], where N is a constant.
Just an example of what I am looking for: I could represent every odd number with one bit...
What's the difference between :: (double colon) and -> (arrow) in PHP?
....
This means that -> is mostly used to access instance members (though it can also be used to access static members, such usage is discouraged), while :: is usually used to access static members (though in a few special cases, it's used to access instance members).
In general, :: is used for sc...
Python “raise from” usage
...and the message states that the exception was directly caused by. If you omit the from then no __cause__ is set, but the __context__ attribute may be set as well, and the traceback then shows the context as during handling something else happened.
Setting the __context__ happens if you used raise i...
get and set in TypeScript
...true,
configurable: true
});
return foo;
})();
So to use it,
var myFoo = new foo();
if(myFoo.bar) { // calls the getter
myFoo.bar = false; // calls the setter and passes false
}
However, in order to use it at all, you must make sure the TypeScript compiler targets E...
Empty set literal?
...
No, there's no literal syntax for the empty set. You have to write set().
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How to generate keyboard events in Python?
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It can be done using ctypes:
import ctypes
from ctypes import wintypes
import time
user32 = ctypes.WinDLL('user32', use_last_error=True)
INPUT_MOUSE = 0
INPUT_KEYBOARD = 1
INPUT_HARDWARE = 2
KEYEVENTF_EXTENDEDKEY = 0x0...