大约有 47,800 项符合查询结果(耗时:0.0975秒) [XML]

https://stackoverflow.com/ques... 

Trying to mock datetime.date.today(), but not working

...wer for more details. In this case, I would subclass datetime.date myself and create the right function: import datetime class NewDate(datetime.date): @classmethod def today(cls): return cls(2010, 1, 1) datetime.date = NewDate And now you could do: >>> datetime.date.tod...
https://stackoverflow.com/ques... 

What is the advantage of using forwarding references in range-based for loops?

...dvantage I can see is when the sequence iterator returns a proxy reference and you need to operate on that reference in a non-const way. For example consider: #include <vector> int main() { std::vector<bool> v(10); for (auto& e : v) e = true; } This doesn't compi...
https://stackoverflow.com/ques... 

Adding options to select with javascript

...ect.appendChild(opt); } JS Fiddle demo. JS Perf comparison of both mine and Sime Vidas' answer, run because I thought his looked a little more understandable/intuitive than mine and I wondered how that would translate into implementation. According to Chromium 14/Ubuntu 11.04 mine is somewhat fas...
https://stackoverflow.com/ques... 

How can I programmatically generate keypress events in C#?

... The question is tagged WPF but the answers so far are specific WinForms and Win32. To do this in WPF, simply construct a KeyEventArgs and call RaiseEvent on the target. For example, to send an Insert key KeyDown event to the currently focused element: var key = Key.Insert; // ...
https://stackoverflow.com/ques... 

What are the “standard unambiguous date” formats for string-to-date conversion in R?

... '"%Y-%m-%d"' then '"%Y/%m/%d"' on the first non-'NA' element, and give an error if neither works. as.Date("01 Jan 2000") yields an error because the format isn't one of the two listed above. as.Date("01/01/2000") yields an incorrect answer because the date isn't in one of the two fo...
https://stackoverflow.com/ques... 

Distinct by property of class with LINQ [duplicate]

... You can use grouping, and get the first car from each group: List<Car> distinct = cars .GroupBy(car => car.CarCode) .Select(g => g.First()) .ToList(); ...
https://stackoverflow.com/ques... 

Add default value of datetime field in SQL Server to a timestamp

...hey didn't put a timestamp in the table. I want it to enter the exact date and time that the record was entered. 12 Answers...
https://stackoverflow.com/ques... 

Do browsers send “\r\n” or “\n” or does it depend on the browser?

... The HTTP and MIME specs specify that header lines must end with \r\n, but they aren't clear (some would argue that it isn't clear if they are clear) about what to do with the contents of a TEXTAREA. (See, for instance, this thread fro...
https://stackoverflow.com/ques... 

How/when to use ng-click to call a route?

... Routes monitor the $location service and respond to changes in URL (typically through the hash). To "activate" a route, you simply change the URL. The easiest way to do that is with anchor tags. <a href="#/home">Go Home</a> <a href="#/about">G...
https://stackoverflow.com/ques... 

What is process.env.PORT in Node.js?

... In many environments (e.g. Heroku), and as a convention, you can set the environment variable PORT to tell your web server what port to listen on. So process.env.PORT || 3000 means: whatever is in the environment variable PORT, or 3000 if there's nothing there...