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How to add an empty column to a dataframe?
...t; df = pd.DataFrame({"A": [1,2,3], "B": [2,3,4]})
>>> df
A B
0 1 2
1 2 3
2 3 4
>>> df["C"] = ""
>>> df["D"] = np.nan
>>> df
A B C D
0 1 2 NaN
1 2 3 NaN
2 3 4 NaN
...
Convert int to char in java
...ascii value 49 (one corresponding to '1')
If you want to convert a digit (0-9), you can add 48 to it and cast, or something like Character.forDigit(a, 10);.
If you want to convert an int as in ascii value, you can use Character.toChars(48) for example.
...
open-ended function arguments with TypeScript
...ritten as,
function sum(...numbers: number[]) {
var aggregateNumber = 0;
for (var i = 0; i < numbers.length; i++)
aggregateNumber += numbers[i];
return aggregateNumber;
}
This will then type check correctly with
console.log(sum(1, 5, 10, 15, 20));
...
Does const mean thread-safe in C++11?
...ue...
This is what the Standard Language has to say on thread-safety:
[1.10/4]
Two expression evaluations conflict if one of them modifies a memory location (1.7) and the other one accesses or modifies the same memory location.
[1.10/21]
The execution of a program contains a data race if it contain...
SyntaxError: Use of const in strict mode
...
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Chrome: timeouts/interval suspended in background tabs?
... |
edited Apr 4 '18 at 20:59
GG.
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answered Ma...
How to send only one UDP packet with netcat?
...
205
If you are using bash, you might as well write
echo -n "hello" >/dev/udp/localhost/8000
a...
Python module os.chmod(file, 664) does not change the permission to rw-rw-r— but -w--wx----
...
130
Found this on a different forum
If you're wondering why that leading zero is important, it's...
Convert number to month name in PHP
...e() to create one, like so:
$monthNum = 3;
$monthName = date('F', mktime(0, 0, 0, $monthNum, 10)); // March
If you want the 3-letter month name like Mar, change F to M. The list of all available formatting options can be found in the PHP manual documentation.
...
How can I delete a query string parameter in JavaScript?
...iteration as may be destructive
for (var i = pars.length; i-- > 0;) {
//idiom for string.startsWith
if (pars[i].lastIndexOf(prefix, 0) !== -1) {
pars.splice(i, 1);
}
}
return urlparts[0] + (pars.length > 0 ? '?'...
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