大约有 15,000 项符合查询结果（耗时：0.0347秒） [XML]
What is the difference between a var and val definition in Scala?
...a var can. However, said object can have its internal state modified. For example:
class A(n: Int) {
var value = n
}
class B(n: Int) {
val value = new A(n)
}
object Test {
def main(args: Array[String]) {
val x = new B(5)
x = new B(6) // Doesn't work, because I can't replace the obje...
Check if a class has a member function of a given signature
...
I'm not sure if I understand you correctly, but you may exploit SFINAE to detect function presence at compile-time. Example from my code (tests if class has member function size_t used_memory() const).
template<typename T>
struct HasUsedMemoryMethod
{
template<typenam...
Remove all elements contained in another array
... method:
myArray = myArray.filter( function( el ) {
return toRemove.indexOf( el ) < 0;
} );
Small improvement, as browser support for Array.includes() has increased:
myArray = myArray.filter( function( el ) {
return !toRemove.includes( el );
} );
Next adaptation using arrow function...
Why is Python 3.x's super() magic?
In Python 3.x, super() can be called without arguments:
1 Answer
1
...
Update a dataframe in pandas while iterating row by row
...
I'm not sure if we read it exactly the same. If you look in my pseudo code I do the modification on the dataframe, not on the value from the iterator. The iterator value is only used for the index of the value/object. What will fail is row['ifor']=some_...
Syntax error on print with Python 3 [duplicate]
Why do I receive a syntax error when printing a string in Python 3?
3 Answers
3
...
Invalid syntax when using “print”? [duplicate]
I'm learning Python and can't even write the first example:
4 Answers
4
...
How can I print each command before executing? [duplicate]
...s the best way to set up a Bash script that prints each command before it executes it?
4 Answers
...
Python if-else short-hand [duplicate]
...
The most readable way is
x = 10 if a > b else 11
but you can use and and or, too:
x = a > b and 10 or 11
The "Zen of Python" says that "readability counts", though, so go for the first way.
Also, the and-or trick will fail if you put a va...
gradlew: Permission Denied
...
Try to set the execution flag on your gradlew file:
chmod +x gradlew
share
|
improve this answer
|
follow
...