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Specify sudo password for Ansible
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For example, you might have a playbook something like this:
- hosts: all
vars_files:
- secret
tasks:
- name: Do something as sudo
service: name=nginx state=restarted
sudo: yes
Here we are including a file called secret which will contain our sudo password.
We will...
Anonymous recursive PHP functions
...al(2) . PHP_EOL; // 2
echo $factorial(5) . PHP_EOL; // 120
Play with it: https://3v4l.org/7AUn2
Source codes from: https://github.com/whitephp/the-little-phper/blob/master/src/chapter_9.php
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Reading a huge .csv file
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You are reading all rows into a list, then processing that list. Don't do that.
Process your rows as you produce them. If you need to filter the data first, use a generator function:
import csv
def getstuff(filename, criterion):
with ...
Super-simple example of C# observer/observable with delegates
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The observer pattern is usually implemented with events.
Here's an example:
using System;
class Observable
{
public event EventHandler SomethingHappened;
public void DoSomething() =>
SomethingHappened?.Invoke(this, EventArgs.Empt...
How to find out the MySQL root password
...id get access somehow, it is hashed with a one-way hash. You can reset it: http://dev.mysql.com/doc/refman/5.0/en/resetting-permissions.html
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M_PI works with math.h but not with cmath in Visual Studio
...) and suddenly it compile perfectly.
Try moving it higher up the page. Totally unsure as to why this would cause issues though.
Edit: Figured it out. The #include <math.h> occurs within cmath's header guards. This means that something higher up the list of #includes is including cmath with...
Setting the selected value on a Django forms.ChoiceField
...rying to assign the selected value to a ChoiceField.
If you have already called super().__init__ in your Form class, you should update the form.initial dictionary, not the field.initial property. If you study form.initial (e.g. print self.initial after the call to super().__init__), it will contai...
GitHub relative link in Markdown file
...rk? Here's some Markdown for you.
Instead of an absolute link:
[a link](https://github.com/user/repo/blob/branch/other_file.md)
…you can use a relative link:
[a relative link](other_file.md)
and we'll make sure it gets linked to user/repo/blob/branch/other_file.md.
If you were...
Parse query string into an array
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Use http://us1.php.net/parse_str
Attention, it's usage is:
parse_str($str, &$array);
not
$array = parse_str($str);
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Is there a way to make mv create the directory to be moved to if it doesn't exist?
...ectories don't exist, is there some way to have those directories automatically created, so that you would only have to type
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