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What is the most efficient way to store a list in the Django models?
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See docs.djangoproject.com/en/3.0/topics/db/examples/many_to_one
– Jon Ison
Jul 2 at 9:42
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How to check if bootstrap modal is open, so i can use jquery validate
... @GregPettit mentions, one can use:
($("element").data('bs.modal') || {})._isShown // Bootstrap 4
($("element").data('bs.modal') || {}).isShown // Bootstrap <= 3
as discussed in Twitter Bootstrap Modal - IsShown.
When the modal is not yet opened, .data('bs.modal') returns undefined, he...
Do zombies exist … in .NET?
...g a thread can cause problems:
class Program
{
static readonly object _lock = new object();
static void Main(string[] args)
{
Thread thread = new Thread(new ThreadStart(Zombie));
thread.Start();
Thread.Sleep(500);
thread.Abort();
Monitor.Enter(_...
Alternative to itoa() for converting integer to string C++? [duplicate]
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In C++11 you can use std::to_string:
#include <string>
std::string s = std::to_string(5);
If you're working with prior to C++11, you could use C++ streams:
#include <sstream>
int i = 5;
std::string s;
std::stringstream out;
out <<...
Java regex email
...ddresses. The Regexp's are very similar:
public static final Pattern VALID_EMAIL_ADDRESS_REGEX =
Pattern.compile("^[A-Z0-9._%+-]+@[A-Z0-9.-]+\\.[A-Z]{2,6}$", Pattern.CASE_INSENSITIVE);
public static boolean validate(String emailStr) {
Matcher matcher = VALID_EMAIL_ADDRESS_REGEX.matche...
Is there a ceiling equivalent of // operator in Python?
...sy) floating-point conversion.
Here's a demonstration:
>>> from __future__ import division # a/b is float division
>>> from math import ceil
>>> b = 3
>>> for a in range(-7, 8):
... print(["%d/%d" % (a, b), int(ceil(a / b)), -(-a // b)])
...
['-7/3', -2, ...
Merge, update, and pull Git branches without using checkouts
...n directory, you can call it as a git command: git merge-ff.
#!/bin/bash
_usage() {
echo "Usage: git merge-ff <branch> <committish-to-merge>" 1>&2
exit 1
}
_merge_ff() {
branch="$1"
commit="$2"
branch_orig_hash="$(git show-ref -s --verify refs/heads/$branch...
How to atomically delete keys matching a pattern using Redis
In my Redis DB I have a number of prefix:<numeric_id> hashes.
23 Answers
23
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How do I check if a string is a number (float)?
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It's not provided 'out of the box' because if is_number(s): x = float(x) else: // fail is the same number of lines of code as the try: x = float(x) catch TypeError: # fail. This utility function is an entirely unecessary abstraction.
– ovangle
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Convert JavaScript string in dot notation into an object reference
... given somewhere (e.g. developer.mozilla.org/en/JavaScript/Reference/Global_Objects/… ).
– ninjagecko
Jun 18 '11 at 6:12
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