大约有 15,000 项符合查询结果（耗时：0.0379秒） [XML]
Create a “with” block on several context managers? [duplicate]
Suppose you have three objects you acquire via context manager, for instance A lock, a db connection and an ip socket.
You can acquire them by:
...
How to use JavaScript variables in jQuery selectors?
...nts via button clicks. I would opt for using data-attributes instead. For example
<input id="bx" type="text">
<button type="button" data-target="#bx" data-method="hide">Hide some input</button>
Then, in your JavaScript
// using event delegation so no need to wrap it in .ready()...
How to join strings in Elixir?
...
The alternative syntax using the pipeline operator: ["StringA", "StringB"] |> Enum.join " "
– Ryan Cromwell
Dec 31 '13 at 2:26
...
Finding ALL duplicate rows, including “elements with smaller subscripts”
...
duplicated has a fromLast argument. The "Example" section of ?duplicated shows you how to use it. Just call duplicated twice, once with fromLast=FALSE and once with fromLast=TRUE and take the rows where either are TRUE.
Some late Edit:
You didn't provide a repro...
Get the closest number out of an array
...ordered but ok for small lists. Even without a binary search a loop could exit if the next number is further way.
– Dominic
Dec 19 '19 at 5:21
...
How can I give eclipse more memory than 512M?
...as much memory as I'd like it to be able to use (between 2 and 4 gigs for example).
Open eclipse.ini in the Eclipse installation directory.
You should be able to change the memory sizes after -vmargs up to 1024 without a problem up to some maximum value that's dependent on your system. Here's that...
How do I determine whether my calculation of pi is accurate?
...quentially. I tried the Taylor series method, but it proved to converge extremely slowly (when I compared my result with the online values after some time). Anyway, I am trying better algorithms.
...
`elif` in list comprehension conditionals
...
Python's conditional expressions were designed exactly for this sort of use-case:
>>> l = [1, 2, 3, 4, 5]
>>> ['yes' if v == 1 else 'no' if v == 2 else 'idle' for v in l]
['yes', 'no', 'idle', 'idle', 'idle']
Hope this helps :-)...
What is the difference between ng-app and data-ng-app?
...ly saying makes template valid HTML, or HTML Validator Compliant, without explaining what THOSE terms mean, either.
I do not know for sure, but I'm guessing that these terms apply to HTML validation programs that scan your code for standards compliance - kind of like lint. They do not recognize ng...
Regular expression to match standard 10 digit phone number
I want to write a regular expression for a standard US type phone number that supports the following formats:
20 Answers
...