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How to select multiple rows filled with constants?
...ostgreSQL you may want to try this syntax
SELECT constants FROM (VALUES ('foo@gmail.com'), ('bar@gmail.com'), ('baz@gmail.com')) AS MyTable(constants)
You can also view an SQL Fiddle here: http://www.sqlfiddle.com/#!17/9eecb/34703/0
...
Should import statements always be at the top of a module?
...odule with a unit test of the form:
if __name__ == '__main__':
import foo
aa = foo.xyz() # initiate something for the test
Secondly, you might have a requirement to conditionally import some different module at runtime.
if [condition]:
import foo as plugin_api
else:
impor...
What's the difference between echo, print, and print_r in PHP?
...used in an expression
e.g. print "Hello"
or, if ($expr && print "foo")
print_r()
Outputs a human-readable representation of any one value
Accepts not just strings but other types including arrays and objects, formatting them to be readable
Useful when debugging
May return its output as...
How do I break out of a loop in Perl?
...
Additional data (in case you have more questions):
FOO: {
for my $i ( @listone ){
for my $j ( @listtwo ){
if ( cond( $i,$j ) ){
last FOO; # --->
# |
} ...
Test if something is not undefined in JavaScript
...
typeof:
var foo;
if (typeof foo == "undefined"){
//do stuff
}
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Best practice for partial updates in a RESTful service
...tch-like-an-idiot PATCH [ { "op": "test", "path": "/a/b/c", "value": "foo" }, { "op": "remove", "path": "/a/b/c" }, { "op": "add", "path": "/a/b/c", "value": [ "foo", "bar" ] }, { "op": "replace", "path": "/a/b/c", "value": 42 }, { "op": "move", "from": "/a/b/c", "path": "/a/b/d...
What's the difference between “Request Payload” vs “Form Data” as seen in Chrome dev tools Network t
...ok like this:
POST /some-path HTTP/1.1
Content-Type: application/json
{ "foo" : "bar", "name" : "John" }
If you submit this per AJAX the browser simply shows you what it is submitting as payload body. That’s all it can do because it has no idea where the data is coming from.
If you submit a H...
Extract traceback info from an exception object
...ntly set using the with_traceback method of exceptions:
raise Exception("foo occurred").with_traceback(tracebackobj)
These features are minimally described as part of the raise documentation.
All credit for this part of the answer should go to Vyctor, who first posted this information. I'm incl...
Python: Bind an Unbound Method?
...t: I'm working in Python 3 -- YMMV).
Consider this simple class:
class Foo(object):
def __init__(self, value):
self._value = value
def value(self):
return self._value
def set_value(self, value):
self._value = value
Here's what you can do with it:
>>...
What is the difference between '@' and '=' in directive scope in AngularJS?
... @JonathanAquino, yes that works, but @ would be more appropriate -- with foo="{{1+1}}" -- because we don't need two-way data binding here. The point I tried to make in the comment above is that we should use = only when the directive needs two-way data binding. Use @ or & otherwise.
...