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how to concatenate two dictionaries to create a new one in Python? [duplicate]
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Slowest and doesn't work in Python3: concatenate the items and call dict on the resulting list:
$ python -mtimeit -s'd1={1:2,3:4}; d2={5:6,7:9}; d3={10:8,13:22}' \
'd4 = dict(d1.items() + d2.items() + d3.items())'
100000 loops, bes...
How can I use interface as a C# generic type constraint?
... constraints to allow, were focused on ones that would let generic classes and methods do things with generic types that they otherwise could not, rather than on preventing them from being used in nonsensical ways. That having been said, an interface constraint on T should allow reference compariso...
How do I add a password to an OpenSSH private key that was generated without a password?
I generated an OpenSSH private key using puttygen (and exported it in OpenSSH format). How can I put a password on this existing key (I know how to generate a new key with a password)?
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Update git commit author date when amending
...--date parameter to git commit. So, if you want to amend the last commit, and update its author date to the current date and time, you can do:
git commit --amend --date="$(date -R)"
(The -R parameter to date tells it to output the date in RFC 2822 format. This is one of the date formats underst...
Define make variable at rule execution time
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In your example, the TMP variable is set (and the temporary directory created) whenever the rules for out.tar are evaluated. In order to create the directory only when out.tar is actually fired, you need to move the directory creation down into the steps:
out.tar : ...
Cannot kill Python script with Ctrl-C
...thread, but because your threads aren't in daemon mode, they keep running, and that keeps the process alive. We can make them daemons:
f = FirstThread()
f.daemon = True
f.start()
s = SecondThread()
s.daemon = True
s.start()
But then there's another problem - once the main thread has started your ...
“/usr/bin/ld: cannot find -lz”
I am trying to compile Android source code under Ubuntu 10.04. I get an error saying,
11 Answers
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Most efficient way to concatenate strings in JavaScript?
In JavaScript, I have a loop that has many iterations, and in each iteration, I am creating a huge string with many += operators. Is there a more efficient way to create a string? I was thinking about creating a dynamic array where I keep adding strings to it and then do a join. Can anyone explain...
Fixed Table Cell Width
... the table-layout:fixed style on the <table> or the tables css class and set the overflow style for the cells
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/col
<table class="fixed">
<col width="20px" />
<col width="30px" />
<col width="40px" />...
How do I ignore the initial load when watching model changes in AngularJS?
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set a flag just before the initial load,
var initializing = true
and then when the first $watch fires, do
$scope.$watch('fieldcontainer', function() {
if (initializing) {
$timeout(function() { initializing = false; });
} else {
// do whatever you were going to do
}
});
Th...