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Python: Convert timedelta to int in a dataframe
...mber of days in a timedelta column. Is it possible to use 'datetime.days' or do I need to do something more manual?
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Shell script to delete directories older than n days
I have directories named as:
5 Answers
5
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Why does calling a method in my derived class call the base class method?
.../override.
You can imagine, that a class, when instantiated, is nothing more than a table of pointers, pointing to the actual implementation of its methods. The following image should visualize this pretty well:
Now there are different ways, a method can be defined. Each behaves different when ...
SQLAlchemy: cascade delete
...s cascade options because I cannot get a simple cascade delete to operate correctly -- if a parent element is a deleted, the children persist, with null foreign keys.
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Pythonic way to check if a list is sorted or not
Is there a pythonic way to check if a list is already sorted in ASC or DESC
23 Answers
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Target elements with multiple classes, within one rule
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.border-blue.background { ... } is for one item with multiple classes.
.border-blue, .background { ... } is for multiple items each with their own class.
.border-blue .background { ... } is for one item where '.background' is t...
Design Patterns: Abstract Factory vs Factory Method
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Hope this helps. It describes the various types of factories. I used Head First Design Patterns as my reference. I used yuml.me to diagram.
Static Factory
Is a class with a Static Method to product various sub types of Product.
Simple Factory
Is a class that can produce var...
Arguments or parameters? [duplicate]
...meters' are used. They seem to be used interchangeably in the programming world.
12 Answers
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Check whether an array is empty [duplicate]
...in array and this definitely doesn't mean that array is empty. As a quick workaround you can do following:
$errors = array_filter($errors);
if (!empty($errors)) {
}
array_filter() function's default behavior will remove all values from array which are equal to null, 0, '' or false.
Otherwise in...
Android Studio: Android Manifest doesn't exists or has incorrect root tag
I got this error on Android Studio (AS):
11 Answers
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