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How to implement a binary tree?
...plementation of binary search tree.
#!/usr/bin/python
class Node:
def __init__(self, val):
self.l = None
self.r = None
self.v = val
class Tree:
def __init__(self):
self.root = None
def getRoot(self):
return self.root
def add(self, val):
...
Get Root Directory Path of a PHP project
...
For PHP >= 5.3.0 try
PHP magic constants.
__DIR__
And make your path relative.
For PHP < 5.3.0 try
dirname(__FILE__)
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Does Python have “private” variables in classes?
... want to emulate private variables for some reason, you can always use the __ prefix from PEP 8. Python mangles the names of variables like __foo so that they're not easily visible to code outside the class that contains them (although you can get around it if you're determined enough, just like you...
How do I deep copy a DateTime object?
...eUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
How can I check if an ip is in a network in Python?
...
Continuing on Rafal's comment, to get this to work on a 64-bit Python interpreter, replace the line in question with: return struct.unpack('<L',socket.inet_aton(ip))[0]
– nitwit
Jan 22 '12 at 9:24
...
How do you copy and paste into Git Bash
...ou have to enable Properties -> Option tab -> Quick Edit Mode)
Ref: http://blogs.windows.com/buildingapps/2014/10/07/console-improvements-in-the-windows-10-technical-preview/
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Doctrine and composite unique keys
...niqueness) Doctrine documentation contains some nice examples by this url: http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/tutorials/composite-primary-keys.html
So the original example could look something like this:
/**
* @var string $videoDimension
*
* @ORM\Id @ORM\Column(typ...
How do I filter ForeignKey choices in a Django ModelForm?
...e fields named directly.
form.rate.queryset = Rate.objects.filter(company_id=the_company.id)
If you take the default ModelForm object, form.fields["rate"].queryset = ...
This is done explicitly in the view. No hacking around.
...
Asking the user for input until they give a valid response
...rsed.
while True:
try:
# Note: Python 2.x users should use raw_input, the equivalent of 3.x's input
age = int(input("Please enter your age: "))
except ValueError:
print("Sorry, I didn't understand that.")
#better try again... Return to the start of the loop
...
Are there legitimate uses for JavaScript's “with” statement?
... same technique used elsewhere - the Chromium source code!
InjectedScript._evaluateOn = function(evalFunction, object, expression) {
InjectedScript._ensureCommandLineAPIInstalled();
// Surround the expression in with statements to inject our command line API so that
// the window object...