大约有 43,000 项符合查询结果（耗时：0.0430秒） [XML]
Why can't strings be mutable in Java and .NET?
...no effort on your part.
[...]
Immutable objects are inherently thread-safe; they require no synchronization. They cannot be corrupted by multiple threads
accessing them concurrently. This is far and away the easiest approach
to achieving thread safety. In fact, no thread can ever obser...
How to write a foreach in SQL Server?
...at:
DECLARE @PractitionerId int
DECLARE MY_CURSOR CURSOR
LOCAL STATIC READ_ONLY FORWARD_ONLY
FOR
SELECT DISTINCT PractitionerId
FROM Practitioner
OPEN MY_CURSOR
FETCH NEXT FROM MY_CURSOR INTO @PractitionerId
WHILE @@FETCH_STATUS = 0
BEGIN
--Do something with Id here
PRINT @Practitio...
Mean per group in a data.frame [duplicate]
...his type of operation is exactly what aggregate was designed for:
d <- read.table(text=
'Name Month Rate1 Rate2
Aira 1 12 23
Aira 2 18 73
Aira 3 19 45
Ben 1 53 19
Ben 2 22 87
Ben 3 19...
How do you read CSS rule values with JavaScript?
...atch(e) { if(e.name == 'SecurityError') { console.log("SecurityError. Cant readd: "+ styleSheets[i].href); continue; }}
var classes = styleSheets[i].cssRules ;
}
for (var x = 0; x < classes.length; x++) {
if (classes[x].selectorText == CLASSname) {
...
Best XML parser for Java [closed]
I need to read smallish (few MB at the most, UTF-8 encoded) XML files, rummage around looking at various elements and attributes, perhaps modify a few and write the XML back out again to disk (preferably with nice, indented formatting).
...
float64 with pandas to_csv
I'm reading a CSV with float numbers like this:
2 Answers
2
...
Making macOS Installer Packages which are Developer ID ready
...he Distribution.xml you can change things like title, background, welcome, readme, license, and so on. You turn your component packages and distribution definition with this command into a product archive:
$ productbuild --distribution ./Distribution.xml \
--package-path . \
./Installer.pkg...
Tutorials and libraries for OpenGL-ES games on Android [closed]
... can play with and change to see what different parts do. Other than that reading OpenGL documentation, will help as well. I am not great at the OpenGL stuff, but have been able to figure things out using the resources I mentioned.
...
UnboundLocalError on local variable when reassigned after first use
...nd parsing.
Consider how the parse of this line of code works. The lexer reads the source text and breaks it into lexemes, the "smallest components" of the grammar. So when it hits the line
c+=1
it breaks it up into something like
SYMBOL(c) OPERATOR(+=) DIGIT(1)
The parser eventually wants ...
Getting started with F# [closed]
...uca Bolognese is still one of the best presentations on the subject). Then read the following two must-read books:
Programming F#: A comprehensive guide for writing simple code to solve complex problems by Chris Smith
Expert F# 2.0 (Expert's Voice in F#) by Don Syme, Adam Granicz, and Antonio Ci...