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how do you filter pandas dataframes by multiple columns
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Note that the Gender and Year should both be strings, i.e., 'Gender' and 'Year'.
– Steven C. Howell
May 4 '17 at 19:47
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With arrays, why is it the case that a[5] == 5[a]?
...left operand wouldn't be a significant burden. (Some languages use "+" for string concatenation; that's certainly not commutative.)
– Keith Thompson
Apr 21 '14 at 18:13
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How do I break out of a loop in Perl?
...found it. You use last instead of break
for my $entry (@array){
if ($string eq "text"){
last;
}
}
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How to validate inputs dynamically created using ng-repeat, ng-show (angular)
...ttempted to use the {{$index}} value to name the inputs, but despite the string literals in HTML appearing correct, it is now working.
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How to convert array to SimpleXML
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Empty Array-values [(string)""] will be changed to an empty SimpleXML-Node instead of being left empty.
– Jonathan
Oct 23 '14 at 10:54
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What is this Javascript “require”?
...you write:
example.js
module.exports = "some code";
Now, you want this string "some code" in another file.
We will name the other file otherFile.js
In this file, you write:
otherFile.js
let str = require('./example.js')
That require() statement goes to the file that you put inside of it,...
Unique combination of all elements from two (or more) vectors
...sing, which works better than the classic expand.grid function because (1) strings are not converted into factors and (2) the sorting is more intuitive:
library(tidyr)
a <- c("ABC", "DEF", "GHI")
b <- c("2012-05-01", "2012-05-02", "2012-05-03", "2012-05-04", "2012-05-05")
crossing(a, b)
# ...
Multiple commands in gdb separated by some sort of delimiter ';'?
...active if the command
# that invoked them is interactive.
# to_string is false. We just want to write the output of the commands, not capture it.
gdb.execute(fragment, from_tty=from_tty, to_string=False)
print()
Cmds()
end
example invocation:
$ gdb
(gdb) cmds echo hi ; e...
warning: implicit declaration of function
...t;stdio.h>
#include <stdlib.h>
#include <xc.h>
#include <string.h>
#include <math.h>
#include <libpic30.h> // http://microchip.wikidot.com/faq:74
#include <stdint.h>
#include <stdbool.h>
#include "GenericTypeDefs.h" // This has the 'BYTE' type defi...
Argparse optional positional arguments?
...gt; parser.add_argument('-v', action='store_true')
_StoreTrueAction(option_strings=['-v'], dest='v', nargs=0, const=True, default=False, type=None, choices=None, help=None, metavar=None)
>>> parser.add_argument('dir', nargs='?', default=os.getcwd())
_StoreAction(option_strings=[], dest='dir...