大约有 40,000 项符合查询结果(耗时:0.0736秒) [XML]

https://stackoverflow.com/ques... 

Do regular expressions from the re module support word boundaries (\b)?

... Python documentation https://docs.python.org/2/library/re.html#regular-expression-syntax \b Matches the empty string, but only at the beginning or end of a word. A word is defined as a sequence of alphanumeric or underscore characters, so the en...
https://stackoverflow.com/ques... 

How to check if a file exists in Documents folder?

... Or just [0] via index accessing – temporary_user_name Dec 16 '14 at 0:09 firstObject is more safe than [0] a...
https://stackoverflow.com/ques... 

SQL Case Sensitive String Compare

... Select * from a_table where attribute = 'k' COLLATE Latin1_General_CS_AS Did the trick. share | improve this answer | ...
https://stackoverflow.com/ques... 

What is the most efficient Java Collections library? [closed]

...asurable different at all with respect to much more expensive ops like the HTTP I/O. I just felt compelled to quantify your post is all. – Riyad Kalla May 3 '11 at 16:24 ...
https://stackoverflow.com/ques... 

Django filter versus get for single object?

... get() is provided specifically for this case. Use it. Option 2 is almost precisely how the get() method is actually implemented in Django, so there should be no "performance" difference (and the fact that you're thinking about it indicates you're vio...
https://stackoverflow.com/ques... 

Do you use source control for your database items? [closed]

...your database under version control. Check the series of posts by K. Scott Allen. When it comes to version control, the database is often a second or even third-class citizen. From what I've seen, teams that would never think of writing code without version control in a million years-- and right...
https://stackoverflow.com/ques... 

What is the performance cost of having a virtual method in a C++ class?

...3ghz in-order PowerPC processor. On that architecture, a virtual function call costs 7 nanoseconds longer than a direct (non-virtual) function call. So, not really worth worrying about the cost unless the function is something like a trivial Get()/Set() accessor, in which anything other than inli...
https://stackoverflow.com/ques... 

Difference between two dates in Python

...eUploader: { brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
https://stackoverflow.com/ques... 

How to hide output of subprocess in Python 2.7

...eUploader: { brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
https://stackoverflow.com/ques... 

What is a stack trace, and how can I use it to debug my application errors?

... org.mortbay.jetty.Server.handle(Server.java:326) at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542) at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:943) at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:756) at org.mortb...