大约有 15,000 项符合查询结果（耗时：0.0418秒） [XML]
Can I call a base class's virtual function if I'm overriding it?
...
The C++ syntax is like this:
class Bar : public Foo {
// ...
void printStuff() {
Foo::printStuff(); // calls base class' function
}
};
share
...
Test if a variable is a list or tuple
...
Go ahead and use isinstance if you need it. It is somewhat evil, as it excludes custom sequences, iterators, and other things that you might actually need. However, sometimes you need to behave differently if someone, for instance, passes a string. My preference there would be to explicitly che...
How do I split a string so I can access item x?
Using SQL Server, how do I split a string so I can access item x?
44 Answers
44
...
Using Caps Lock as Esc in Mac OS X
How do I make Caps Lock work like Esc in Mac OS X?
14 Answers
14
...
I get exception when using Thread.sleep(x) or wait()
...
You have a lot of reading ahead of you. From compiler errors through exception handling, threading and thread interruptions. But this will do what you want:
try {
Thread.sleep(1000); //1000 milliseconds is one second.
} catch(InterruptedException ex) {
Thread.currentThr...
Converting integer to binary in python
...
>>> '{0:08b}'.format(6)
'00000110'
Just to explain the parts of the formatting string:
{} places a variable into a string
0 takes the variable at argument position 0
: adds formatting options for this variable (otherwise it would represent decimal 6)
08 formats the n...
Pandas count(distinct) equivalent
...this is what you want:
table.groupby('YEARMONTH').CLIENTCODE.nunique()
Example:
In [2]: table
Out[2]:
CLIENTCODE YEARMONTH
0 1 201301
1 1 201301
2 2 201301
3 1 201302
4 2 201302
5 2 201302
6 3 ...
What's the best way to develop a sideswipe menu like the one in Facebook's new iOS app?
...doesn't have all of the features of ViewDeck but is simpler to modify and extend.
share
|
improve this answer
|
follow
|
...
How to avoid annoying error “declared and not used”
...)
func main() {
i := 1 // no more error
_ = i
}
As said by kostix in the comments below, you can find the official position of the Go team in the FAQ:
The presence of an unused variable may indicate a bug, while unused imports just slow down compilation. Accumulate enough unused impo...
Calling a method every x minutes
...gives a compile error. TotalMilliseconds returns a double while the timer expects integers or TimeSpan. I tried to update your answer to one that employs TimeSpan and throws out unnecessary bloat; however, you reverted it.
– André C. Andersen
Feb 5 '14 at 23:0...