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In Django, how does one filter a QuerySet with dynamic field lookups?
... argument expansion may be used to solve this problem:
kwargs = {
'{0}__{1}'.format('name', 'startswith'): 'A',
'{0}__{1}'.format('name', 'endswith'): 'Z'
}
Person.objects.filter(**kwargs)
This is a very common and useful Python idiom.
...
Simple argparse example wanted: 1 argument, 3 results
...ou started.
import argparse
parser = argparse.ArgumentParser()
parser.add_argument("a")
args = parser.parse_args()
if args.a == 'magic.name':
print 'You nailed it!'
But this positional argument is now required. If you leave it out when invoking this program, you'll get an error about missin...
How to get the currently logged in user's user id in Django?
...iddleware and AuthenticationMiddleware middlewares added to your MIDDLEWARE_CLASSES setting.
The current user is in request object, you can get it by:
def sample_view(request):
current_user = request.user
print current_user.id
request.user will give you a User object representing the cu...
How can I view all the git repositories on my machine?
... it out. Edit out svn and cvs if not required
– quiet_penguin
Oct 29 '18 at 12:32
...
WatiN or Selenium? [closed]
...s with Selenium (not that I know off, at least):
class IEManager
{
IE _ie = null;
object _lock = new object();
IE GetInstance(string UrlFragment)
{
lock (_lock)
{
if (_ie == null)
{
var instances = new IECollection(true); //F...
Unique Key constraints for multiple columns in Entity Framework
...
With Entity Framework 6.1, you can now do this:
[Index("IX_FirstAndSecond", 1, IsUnique = true)]
public int FirstColumn { get; set; }
[Index("IX_FirstAndSecond", 2, IsUnique = true)]
public int SecondColumn { get; set; }
The second parameter in the attribute is where you can spec...
What are deferred objects?
...e".split(" "),
// Create a simple deferred (one callbacks list)
/* Class: _Deferred.
* methods: done, resolve, resolveWith, isResolved
* internal method: cancel
*
* Basically allows you to attach callbacks with the done method.
* Then resolve the deferred action whenever you want with an a...
Representing and solving a maze given an image
...d image directly.
Here is the MATLAB code for BFS:
function path = solve_maze(img_file)
%% Init data
img = imread(img_file);
img = rgb2gray(img);
maze = img > 0;
start = [985 398];
finish = [26 399];
%% Init BFS
n = numel(maze);
Q = zeros(n, 2);
M = zeros([size(maze) 2]);
...
What do linkers do?
..., let's study a NASM x86-64 ELF Linux hello world:
section .data
hello_world db "Hello world!", 10
section .text
global _start
_start:
; sys_write
mov rax, 1
mov rdi, 1
mov rsi, hello_world
mov rdx, 13
syscall
; sys_exit
...
What is the difference between String.Empty and “” (empty string)?
...private hidebysig instance string foo() cil managed
{
.maxstack 8
L_0000: ldstr "foo"
L_0005: ret
}
.method private hidebysig instance string bar() cil managed
{
.maxstack 8
L_0000: ldstr "bar"
L_0005: ldsfld string [mscorlib]System.String::Empty
L_000a: call string [msc...