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namedtuple and default values for optional keyword arguments
...
Python 3.7
Use the defaults parameter.
>>> from collections import namedtuple
>>> fields = ('val', 'left', 'right')
>>> Node = namedtuple('Node', fields, defaults=(None,) * len(fields))
>>> Node()
Node(val=None, left=None, right=None)
Or b...
Parsing a comma-delimited std::string [duplicate]
...weren't there at all. Just for example, we'll read comma-delimited numbers from input, and write then out one-per line on standard output:
#include <algorithm>
#include <iterator>
#include <iostream>
int main() {
std::cin.imbue(std::locale(std::locale(), new csv_reader()));
...
Why are Python's 'private' methods not actually private?
...utes of their superclasses. It's not designed to prevent deliberate access from outside.
For example:
>>> class Foo(object):
... def __init__(self):
... self.__baz = 42
... def foo(self):
... print self.__baz
...
>>> class Bar(Foo):
... def __init...
Get a specific bit from byte
I have a byte, specifically one byte from a byte array which came in via UDP sent from another device. This byte stores the on/off state of 8 relays in the device.
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Removing duplicates in lists
...a set. Sets are unordered collections of distinct objects. To create a set from any iterable, you can simply pass it to the built-in set() function. If you later need a real list again, you can similarly pass the set to the list() function.
The following example should cover whatever you are trying...
What is the purpose of std::make_pair vs the constructor of std::pair?
...e passed to it, without you needing to tell it. That's what I could gather from various docs anyways.
See this example from http://www.cplusplus.com/reference/std/utility/make_pair/
pair <int,int> one;
pair <int,int> two;
one = make_pair (10,20);
two = make_pair (10.5,'A'); // ok: imp...
how can I see what ports mongo is listening on from mongo shell?
...ngo instance running, how can I check what port numbers it is listening on from the shell? I thought that db.serverStatus() would do it but I don't see it. I see this
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How to copy a file from one directory to another using PHP?
...'foo/test.php', 'bar/test.php');
Quoting a couple of relevant sentences from its manual page :
Makes a copy of the file source to
dest. If the destination
file already exists, it will be
overwritten.
share
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Is there a code obfuscator for PHP? [closed]
...ll offer you obfuscators, but no amount of obfuscation can prevent someone from getting at your code. None. If your computer can run it, or in the case of movies and music if it can play it, the user can get at it. Even compiling it to machine code just makes the job a little more difficult. If ...
Split a module across several files
...e is to make use of pub use, which will allow you to re-export identifiers from other modules. There is precedent for this in Rust's std::io crate where some types from sub-modules are re-exported for use in std::io.
Edit (2019-08-25): the following part of the answer was written quite some time...