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...rticle. Pythons hashing algorithms are explained on effbot.org and pythons __hash__ function in the python reference.
Some facts:
Set elements as well as dictionary keys have to be hashable
Some unhashable datatypes:
list: use tuple instead
set: use frozenset instead
dict: has no official count...
How to create a new java.io.File in memory?
...then be used to read from and write to the file.
You can create a stream based on a byte buffer which resides in memory, by using a ByteArrayInputStream and a ByteArrayOutputStream to read from and write to a byte buffer in a similar way you read and write from a file. The byte array contains the ...
How To Change DataType of a DataColumn in a DataTable?
...newType)
{
using (DataColumn dc = new DataColumn(columnName + "_new", newType))
{
// Add the new column which has the new type, and move it to the ordinal of the old column
int ordinal = dt.Columns[columnName].Ordinal;
dt.Columns.Add(dc);
...
Where do I set my company name?
...
If you want change __MyCompanyName__ in Xcode 4, you can try the following command.
defaults write com.apple.dt.Xcode PBXCustomTemplateMacroDefinitions '{ORGANIZATIONNAME="YourNameHere";}'
Carefully, this writes in the domain, com.apple.dt.Xc...
Difference between assertEquals and assertSame in phpunit?
...ly about an interpreted value, be it by type juggling or an object with an __magic presentation method (__toString() for example).
A good use case for assertSame() is testing a singleton factory.
class CacheFactoryTest extends TestCase
{
public function testThatCacheFactoryReturnsSingletons()
...
What is a NullPointerException, and how do I fix it?
... doSomething() could be written as:
/**
* @param obj An optional foo for ____. May be null, in which case
* the result will be ____.
*/
public void doSomething(SomeObject obj) {
if(obj == null) {
//do something
} else {
//do something else
}
}
Finally, How to pinpo...
How can I return two values from a function in Python?
... you can return a tuple or a list and unpack it after the call:
def select_choice():
...
return i, card # or [i, card]
my_i, my_card = select_choice()
On line return i, card i, card means creating a tuple. You can also use parenthesis like return (i, card), but tuples are created by com...
How to convert array values to lowercase in PHP?
...
use array_map():
$yourArray = array_map('strtolower', $yourArray);
In case you need to lowercase nested array (by Yahya Uddin):
$yourArray = array_map('nestedLowercase', $yourArray);
function nestedLowercase($value) {
if (is_...
Find the most common element in a list
...ponents. Consider for example:
import itertools
import operator
def most_common(L):
# get an iterable of (item, iterable) pairs
SL = sorted((x, i) for i, x in enumerate(L))
# print 'SL:', SL
groups = itertools.groupby(SL, key=operator.itemgetter(0))
# auxiliary function to get "quality"...
Find the PID of a process that uses a port on Windows
... or, nestat -aon | findstr 123456
– ROMANIA_engineer
Feb 9 '16 at 14:18
Easy way to achieve this on windows ...