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What is the syntax to insert one list into another list in python?
...e's the insert method which acts similarly to append but allows you to specify the insertion point:
>>> list_one.insert(2, list_two)
>>> list_one
[1, 2, [4, 5, 6], 3, 4, 5, 6]
To extend a list at a specific insertion point you can use list slicing (thanks, @florisla):
>>&...
How to drop columns using Rails migration
...:table_name, :column_name, :type, :options within the change method, since if you specify the type reverting the migration is possible. From the documentation: The typeand options parameters will be ignored if present. It can be helpful to provide these in a migration's change method so it can be re...
What's wrong with this 1988 C code?
...When the preprocessor expands them, your code will look roughly like:
if (c == ' ' || c == '\n' || c == '\t')
state = 0;; /* <--PROBLEM #1 */
else if (state == 0;) { /* <--PROBLEM #2 */
state = 1;;
That second semicolon causes the else to have no previous if as a mat...
Best way to allow plugins for a PHP application
...eners;
$num_args = func_num_args();
$args = func_get_args();
if($num_args < 2)
trigger_error("Insufficient arguments", E_USER_ERROR);
// Hook name should always be first argument
$hook_name = array_shift($args);
if(!isset($listeners[$hook_name]))
return...
Some built-in to pad a list in python
...
a += [''] * (N - len(a))
or if you don't want to change a in place
new_a = a + [''] * (N - len(a))
you can always create a subclass of list and call the method whatever you please
class MyList(list):
def ljust(self, n, fillvalue=''):
ret...
JSON.NET Error Self referencing loop detected for type
...e fix only applies to JSON.net
The level of references can't be controlled if there is a deep reference chain
If you want to use this fix in a non-api ASP.NET project, you can add the above line to Global.asax.cs, but first add:
var config = GlobalConfiguration.Configuration;
If you want to use th...
Check if table exists in SQL Server
I would like this to be the ultimate discussion on how to check if a table exists in SQL Server 2000/2005 using SQL Statements.
...
TypeScript sorting an array
... a function that returns number, not boolean.
You need to return negative if the first item is smaller; positive if it it's larger, or zero if they're equal.
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How can I convert a string to boolean in JavaScript?
...esn't make any implicit type conversions when the compared variables have different types, instead of the equality operator (==).
var isTrueSet = (myValue === 'true');
Don't:
You should probably be cautious about using these two methods for your specific needs:
var myBool = Boolean("false"); ...
When do you need to explicitly call a superclass constructor?
...
You never need just
super();
That's what will be there if you don't specify anything else. You only need to specify the constructor to call if:
You want to call a superclass constructor which has parameters
You want to chain to another constructor in the same class instead of t...