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Difference between len() and .__len__()?
Is there any difference between calling len([1,2,3]) or [1,2,3].__len__() ?
4 Answers
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Set attributes from dictionary in python
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If you pass initial data as def __init__(self,**initial_data) you get the added benefit of having an init method that can also do keyword arguments too (e.g. "e = Employee(name='Oscar')" or just take in a dictionary (e.g. "e ...
How do I initialize the base (super) class?
...t(foo)
Because python knows about old- and new-style classes, there are different ways to invoke a base method, which is why you've found multiple ways of doing so.
For completeness sake, old-style classes call base methods explicitly using the base class, i.e.
def doit(self, foo):
return X.do...
Making macOS Installer Packages which are Developer ID ready
...blems and Solutions
Stupid tricks with pkgbuild
persisting obsolescence
Known Issues and Workarounds
Destination Select Pane
The user is presented with the destination select option with only a single choice - "Install for all users of this computer". The option appears visually selected, but th...
python NameError: global name '__file__' is not defined
... shell when you C-c C-p? python-shell. Is there a way to use this shell as if it were a terminal running the file? There are 3 options for running the shell : CMD DEDICATED SHOW Would one of them do this?
– sinekonata
Jul 2 at 0:43
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How do I get a PHP class constructor to call its parent's parent's constructor?
... __construct($bypass = false)
{
// only perform actions inside if not bypassing
if (!$bypass) {
}
// call Grandpa's constructor
parent::__construct();
}
}
class Kiddo extends Papa
{
public function __construct()
{
$bypassPapa = true;
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Click Event on UIImageView programmatically in ios
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Now in Swift!
let singleTap = UITapGestureRecognizer(target: self, action: Selector("tapDetected"))
singleTap.numberOfTapsRequired = 1
preArrowImage.userInteractionEnabled = true
preArrowImage.addGestureRecognizer(singleTap...
How do I get the opposite (negation) of a Boolean in Python?
...> value = False
>>> not value
True
So instead of your code:
if bool == True:
return False
else:
return True
You could use:
return not bool
The logical negation as function
There are also two functions in the operator module operator.not_ and it's alias operator.__not__ i...
Get all object attributes in Python? [duplicate]
...r__, may be RPC proxy objects, or may be instances of C-extension classes. If your object is one these examples, they may not have a __dict__ or be able to provide a comprehensive list of attributes via __dir__: many of these objects may have so many dynamic attrs it doesn't won't actually know what...
How to sort a list of objects based on an attribute of the objects?
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No problem. btw, if muhuk is right and it's a list of Django objects, you should consider his solution. However, for the general case of sorting objects, my solution is probably best practice.
– Triptych
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