大约有 46,000 项符合查询结果（耗时：0.0522秒） [XML]
How do I check OS with a preprocessor directive?
...need my code to do different things based on the operating system on which it gets compiled. I'm looking for something like this:
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When do I need to use AtomicBoolean in Java?
...ultiple threads need to check and change the boolean. For example:
if (!initialized) {
initialize();
initialized = true;
}
This is not thread-safe. You can fix it by using AtomicBoolean:
if (atomicInitialized.compareAndSet(false, true)) {
initialize();
}
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Catch multiple exceptions in one line (except block)
...gMeanException), e:
pass
Separating the exception from the variable with a comma will still work in Python 2.6 and 2.7, but is now deprecated and does not work in Python 3; now you should be using as.
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AngularJS HTTP post to PHP and undefined
I have a form with the tag ng-submit="login()
9 Answers
9
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How do I add multiple arguments to my custom template filter in a django template?
...go's docs and book but only found example using a single argument... is it even possible?
9 Answers
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How to access parent Iframe from JavaScript
...
Maybe it is not obvious for everyone, but with this method you can access a library object of the parent (only if the parent has already loaded the library). Example: access jQuery with parent.$('#something')
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How can I programmatically check whether a keyboard is present in iOS app?
I need to check the condition of keyboard visibility in my iOS app.
20 Answers
20
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Command to get nth line of STDOUT
... -l | sed -n 2p
Using this alternative, which looks more efficient since it stops reading the input when the required line is printed, may generate a SIGPIPE in the feeding process, which may in turn generate an unwanted error message:
ls -l | sed -n -e '2{p;q}'
I've seen that often enough that...
List to array conversion to use ravel() function
I have a list in python and I want to convert it to an array to be able to use ravel() function.
6 Answers
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How to remove the first and the last character of a string
...);
console.log(result);
Or you can use .slice as suggested by Ankit Gupta
var yourString = "/installers/services/";
var result = yourString.slice(1,-1);
console.log(result);
Documentation for the slice and substring.
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