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How to construct a relative path in Java from two absolute paths (or URLs)?
... dir
// For example, the relative path from
//
// /foo/bar/baz/gg/ff to /foo/bar/baz
//
// ".." if ff is a file
// "../.." if ff is a directory
//
// The following is a heuristic to figure out if the base refers to a file or dir. It's ...
How to get name of exception that was caught in Python?
...tion.__class__.__name__
exception.__class__.__qualname__
e.g.,
try:
foo = bar
except Exception as exception:
assert type(exception).__name__ == 'NameError'
assert exception.__class__.__name__ == 'NameError'
assert exception.__class__.__qualname__ == 'NameError'
...
How do I append one string to another in Python?
...neck caused by string concatenations then just stick with + and +=:
s = 'foo'
s += 'bar'
s += 'baz'
That said, if you're aiming for something like Java's StringBuilder, the canonical Python idiom is to add items to a list and then use str.join to concatenate them all at the end:
l = []
l.append...
How/When does Execute Shell mark a build as failure in Jenkins?
... exit code, you can either hoist the command into your if statement:
grep foo bar; if [ $? == 0 ]; then ... --> if grep foo bar; then ...
Or you can capture the return code in your || clause:
grep foo bar || ret=$?
...
What is the python “with” statement designed for?
...sulated for convenient reuse.
2.
You could do something like:
with open("foo.txt") as foo_file:
data = foo_file.read()
OR
from contextlib import nested
with nested(A(), B(), C()) as (X, Y, Z):
do_something()
OR (Python 3.1)
with open('data') as input_file, open('result', 'w') as outpu...
What are the main purposes of using std::forward and which problems it solves?
...the function the parameter could be passed as an lvalue to anything:
void foo(int&);
template <typename T>
void deduce(T&& x)
{
foo(x); // fine, foo can refer to x
}
deduce(1); // okay, foo operates on x which has a value of 1
That's no good. E needs to get the same kind o...
Is it possible to use jQuery .on and hover?
...ny interference. But .hover() works just fine as an event with .on().
$("#foo").on("hover", function() {
// disco
});
If you want to be able to utilize its events, use the returned object from the event:
$("#foo").on("hover", function(e) {
if(e.type == "mouseenter") {
console.log("over")...
When is an interface with a default method initialized?
...c static void main(String[] args) throws Exception {
InterfaceType foo = new InterfaceTypeImpl();
System.out.println(InterfaceType.init);
foo.method();
}
}
class InterfaceTypeImpl implements InterfaceType {
@Override
public void method() {
System.out.prin...
Which MySQL data type to use for storing boolean values
...
@Walter: This is easy to test, e.g SELECT 'foo' AS bar FROM dual WHERE -7. The expression -7 is evaluated in a boolean context, and the query returns a row. We can test with 0, or any expression that evaluates to integer value 0, and no row is returned. If the expres...
Interfaces — What's the point?
...BolucPapuccuoglu: Beyond that, with a statically-typed object if one knows foo implements IWidget, then a programmer seeing a call to foo.woozle() can look at the documentation for IWidget and know what that method is supposed to do. The programmer might have no way of knowing where the code for th...