For documenting classes with roxygen(2), specifying a title and description/details appears to be the same as for functions, methods, data, etc. However, slots and inheritance are their own sort of animal. What is the best practice — current or planned — for documenting S4 classes in roxygen2? Due Diligence: I found mention of an @slot … Read more
This question already has answers here: difference between variables inside and outside of __init__() (12 answers) Closed 1 year ago. I noticed that in Python, people initialize their class attributes in two different ways. The first way is like this: class MyClass: __element1 = 123 __element2 = “this is Africa” def __init__(self): #pass or something … Read more
What is the difference between private and protected members in C++ classes? I understand from best practice conventions that variables and functions which are not called outside the class should be made private—but looking at my MFC project, MFC seems to favor protected. What’s the difference and which should I use? 19 Answers 19
This question already has answers here: How to apply two CSS classes to a single element (7 answers) Closed 3 years ago. What am I doing wrong here? I have a .social div, but on the first one I want zero padding on the top, and on the second one I want no bottom border. … Read more
All I am trying to do is to get the current class name, and java appends a useless non-sense $1 to the end of my class name. How can I get rid of it and only return the actual class name? String className = this.getClass().getName(); 12 Answers 12
It’s a bit difficult to implement a deep object copy function. What steps you take to ensure the original object and the cloned one share no reference? 21 Answers 21
I have this code which calculates the distance between two coordinates. The two functions are both within the same class. However, how do I call the function distToPoint in the function isNear? class Coordinates: def distToPoint(self, p): “”” Use pythagoras to find distance (a^2 = b^2 + c^2) “”” … def isNear(self, p): distToPoint(self, p) … Read more
With PEP 557 data classes are introduced into python standard library. They make use of the @dataclass decorator and they are supposed to be “mutable namedtuples with default” but I’m not really sure I understand what this actually means and how they are different from common classes. What exactly are python data classes and when … Read more
Why is cls sometimes used instead of self as an argument in Python classes? For example: class Person: def __init__(self, firstname, lastname): self.firstname = firstname self.lastname = lastname @classmethod def from_fullname(cls, fullname): cls.firstname, cls.lastname = fullname.split(‘ ‘, 1) 6 Answers 6
I want to implement constants in a class, because that’s where it makes sense to locate them in the code. So far, I have been implementing the following workaround with static methods: class MyClass { static constant1() { return 33; } static constant2() { return 2; } // … } I know there is a … Read more
