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Two way/reverse map [duplicate]
.../ 2
And it works like so:
>>> d = TwoWayDict()
>>> d['foo'] = 'bar'
>>> d['foo']
'bar'
>>> d['bar']
'foo'
>>> len(d)
1
>>> del d['foo']
>>> d['bar']
Traceback (most recent call last):
File "<stdin>", line 7, in <module>
...
CoffeeScript, When to use fat arrow (=>) over arrow (->) and vice versa
...
Usually, -> is fine.
class Foo
@static: -> this
instance: -> this
alert Foo.static() == Foo # true
obj = new Foo()
alert obj.instance() == obj # true
Note how the static method return the class object for this and the instance returns th...
Short description of the scoping rules?
...es module: open, range, SyntaxError, etc
So, in the case of
code1
class Foo:
code2
def spam():
code3
for code4:
code5
x()
The for loop does not have its own namespace. In LEGB order, the scopes would be
L: Local in def spam (in code3, code4, an...
Converting an object to a string
... This doesn't work if the object has a function property, eg: foo: function () {...}.
– Brock Adams
Sep 29 '12 at 14:54
...
How do I trim a file extension from a String in Java?
...ething that can be easily done with a single line.
– foo
Sep 3 '18 at 9:40
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What is “rvalue reference for *this”?
...-member functions? Operator overloading, that's why. Consider this:
struct foo{
foo& operator<<(void*); // implementation unimportant
};
foo& operator<<(foo&, char const*); // implementation unimportant
You'd certainly want the following to call the free function, don't y...
When should I use @classmethod and when def method(self)?
...mation about the instance or class on which it was called.
In [6]: class Foo(object): some_static = staticmethod(lambda x: x+1)
In [7]: Foo.some_static(1)
Out[7]: 2
In [8]: Foo().some_static(1)
Out[8]: 2
In [9]: class Bar(Foo): some_static = staticmethod(lambda x: x*2)
In [10]: Bar.some_static...
Blocks and yields in Ruby
...rguments, if needed. Consider this example method that demonstrates:
def foo(x)
puts "OK: called as foo(#{x.inspect})"
yield("A gift from foo!") if block_given?
end
foo(10)
# OK: called as foo(10)
foo(123) {|y| puts "BLOCK: #{y} How nice =)"}
# OK: called as foo(123)
# BLOCK: A gift from foo!...
Difference between timestamps with/without time zone in PostgreSQL
...ime zone.
Here are examples covering the combinations of those factors:
foo=> SET TIMEZONE TO 'Japan';
SET
foo=> SELECT '2011-01-01 00:00:00'::TIMESTAMP;
timestamp
---------------------
2011-01-01 00:00:00
(1 row)
foo=> SELECT '2011-01-01 00:00:00'::TIMESTAMP WITH TIME ZONE...
Pass entire form as data in jQuery Ajax function
...select> options are serialized under the same key, e.g.
<select id="foo" name="foo" multiple="multiple">
<option value="1">one</option>
<option value="2">two</option>
<option value="3">three</option>
</select>
will result in a query s...