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Sort a list of tuples by 2nd item (integer value) [duplicate]
... you can add a negative sign, this will sort using the first element first and then second element: sorted(some_list, lambda x: (x[0], -x[1],))
– Seraf
Mar 10 '19 at 17:34
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php execute a background process
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Assuming this is running on a Linux machine, I've always handled it like this:
exec(sprintf("%s > %s 2>&1 & echo $! >> %s", $cmd, $outputfile, $pidfile));
This launches the command $cmd, redirects the command output to $outputfile, and writes the process id to...
iOS start Background Thread
... is responsible for setting up the new thread's autorelease pool, run loop and other configuration details – see "Using NSObject to Spawn a Thread" in Apple's Threading Programming Guide.
You'd probably be better off using Grand Central Dispatch, though:
dispatch_async(dispatch_get_global_queue(...
Command not found error in Bash variable assignment
...d your '=' sign.
When you write:
STR = "foo"
bash tries to run a command named STR with 2 arguments (the strings '=' and 'foo')
When you write:
STR =foo
bash tries to run a command named STR with 1 argument (the string '=foo')
When you write:
STR= foo
bash tries to run the command foo ...
In JavaScript, why is “0” equal to false, but when tested by 'if' it is not false by itself?
...you explicitly do "0" == false, both sides are being converted to numbers, and then the comparison is performed.
When you do: if ("0") console.log("ha"), the string value is being tested. Any non-empty string is true, while an empty string is false.
Equal (==)
If the two operands are not o...
Do checkbox inputs only post data if they're checked?
Is it standard behaviour for browsers to only send the checkbox input value data if it is checked upon form submission?
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Detect the Enter key in a text input field
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Your code wasnt working because you used .is() and needed === rather than ==. See my answer for some more details.
– wesbos
Aug 15 '11 at 0:48
7
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Conditionally Remove Dataframe Rows with R [duplicate]
... tried so many complicated answers -- none worked. Your solution is simple and brilliant.
– WGray
Aug 6 '15 at 20:49
5
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What does the unary plus operator do?
... plus operator do? There are several definitions that I have found ( here and here ) but I still have no idea what it would be used for. It seems like it doesn't do anything but there has be a reason for it, right?
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Calculate number of hours between 2 dates in PHP
...sions provide some new classes called DateTime, DateInterval, DateTimeZone and DatePeriod. The cool thing about this classes is, that it considers different timezones, leap years, leap seconds, summertime, etc. And on top of that it's very easy to use. Here's what you want with the help of this obje...