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MongoDB SELECT COUNT GROUP BY
...ier way to do it using aggregate:
db.contest.aggregate([
{"$group" : {_id:"$province", count:{$sum:1}}}
])
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How to shuffle a std::vector?
...#include <algorithm>
#include <random>
auto rng = std::default_random_engine {};
std::shuffle(std::begin(cards_), std::end(cards_), rng);
Live example on Coliru
Make sure to reuse the same instance of rng throughout multiple calls to std::shuffle if you intend to generate different p...
Linux command or script counting duplicated lines in a text file?
...3
}
or you can use a simple one-liner:
$ cat filename | python3 -c 'print(__import__("json").dumps(__import__("collections").Counter(map(str.strip, __import__("fileinput").input())), indent=2))'
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How can I expand the full path of the current file to pass to a command in Vim?
...ught me here, this should be the chosen answer.
– doc_id
Mar 2 '13 at 1:15
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php $_POST array empty upon form submission
...ed to share it as it cost me much time.
When using JSON content-type the $_POST array will not populate (only with multi-part forms I believe)
Here is what did work to correct the issue:
$rest_json = file_get_contents("php://input");
$_POST = json_decode($rest_json, true);
hope this helps someo...
Updating MySQL primary key
I have a table user_interactions with 4 columns:
3 Answers
3
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clang: how to list supported target architectures?
...e triples requires solving the Halting Problem. See, for example, llvm::ARM_MC::ParseARMTriple(...) which special-cases parsing the string "generic".
Ultimately, though, the "triple" is mostly a backwards-compatibility feature to make Clang a drop-in replacement for GCC, so you generally don't need...
clang error: unknown argument: '-mno-fused-madd' (python package installation failure)
...s/2.7/include/python2.7 -fno-strict-aliasing -fno-common -dynamic -arch x86_64 -arch i386 -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -mno-fused-madd -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -Wstrict-prototypes -Wshorten-64-to-32 -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DT...
How do I search for an object by its ObjectId in the mongo console?
...est.find() // no criteria
{ "_id" : ObjectId("4ecc05e55dd98a436ddcc47c"), "x" : 1 }
> db.test.find({"_id" : ObjectId("4ecc05e55dd98a436ddcc47c")}) // explicit
{ "_id" : ObjectId("4ecc05e55dd98a436ddcc47c"), "x" : 1 }
> db.test.find(ObjectId...
open read and close a file in 1 line of code
...athlib module does what you looking for:
Path('pagehead.section.htm').read_text()
Don't forget to import Path:
jsk@dev1:~$ python3
Python 3.5.2 (default, Sep 10 2016, 08:21:44)
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from ...