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One-liner to check whether an iterator yields at least one element?
... Similarly if you need to check if the iterator is empty, one could use all(False for _ in iterator) will check if the iterator is empty. (all returns True if the iterator is empty, otherwise it stops when it sees the first False element)
– KGardevoir
Apr 3 ...
Python argparse command line flags without arguments
...a look at http://docs.python.org/dev/library/argparse.html#action (specifically store_true and store_false)
import argparse
parser = argparse.ArgumentParser()
parser.add_argument('-w', action='store_true')
where action='store_true' implies default=False.
Conversely, you could haveaction='store_...
How to select an element by classname using jqLite?
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Essentially, and as-noted by @kevin-b:
// find('#id')
angular.element(document.querySelector('#id'))
//find('.classname'), assumes you already have the starting elem to search from
angular.element(elem.querySelector('.classname'))...
Using git commit -a with vim
...rupt the commit when I quit vim?
There are 2 ways:
:cq or :cquit
Delete all lines of the commit message, including comments, and then :wq
Either way will give git an error code, so it will not proceed with the commit. This is particularly useful with git commit --amend.
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How can I obtain an 'unbalanced' grid of ggplots?
...RonGejman it's easy if you print the 3x2 matrix on screen: first column is all 1s, that's where the first plot lives, spanning the three rows; second column contains plots 2, 3, 4, each occupying one row.
– baptiste
Sep 30 '15 at 18:59
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How to check if a given directory exists in Ruby
I am trying to write a script which automatically checks out or updates a Subversion URL based on whether a specified directory exists or not.
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count members with jsonpath?
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@mattb - if using Maven, do not add hamcrest-all as a dependancy, but use hamcrest-library: code.google.com/p/hamcrest/wiki/HamcrestDistributables
– Adam Michalik
Nov 3 '15 at 13:37
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jQuery lose focus event
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Use blur event to call your function when element loses focus :
$('#filter').blur(function() {
$('#options').hide();
});
share
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improve ...
How do I determine which iOS SDK I have?
..., but how do I determine which version of the iOS SDK I currently have installed?
5 Answers
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passing several arguments to FUN of lapply (and others *apply)
...e, we find the following line:
...: optional arguments to ‘FUN’.
So all you have to do is include your other argument in the lapply call as an argument, like so:
lapply(input, myfun, arg1=6)
and lapply, recognizing that arg1 is not an argument it knows what to do with, will automatically p...