I would like to test whether a class inherits from another class, but there doesn’t seem to exist a method for that. class A end class B < A end B.is_a? A => false B.superclass == A => true A trivial implementation of what I want would be: class Class def is_subclass_of?(clazz) return true if … Read more
The following use of super() raises a TypeError: why? >>> from HTMLParser import HTMLParser >>> class TextParser(HTMLParser): … def __init__(self): … super(TextParser, self).__init__() … self.all_data = [] … >>> TextParser() (…) TypeError: must be type, not classobj There is a similar question on StackOverflow: Python super() raises TypeError, where the error is explained by the … Read more
I read this question and thought that would easily be solved (not that it isn’t solvable without) if one could write: @Override public String toString() { return super.super.toString(); } I’m not sure if it is useful in many cases, but I wonder why it isn’t and if something like this exists in other languages. What … Read more
class A: def __init__(self): print(“world”) class B(A): def __init__(self): print(“hello”) B() # output: hello In all other languages I’ve worked with the super constructor is invoked implicitly. How does one invoke it in Python? I would expect super(self) but this doesn’t work. 7 Answers 7
Anytime I have to re-import my projects into Eclipse (if I reinstalled Eclipse, or changed the location of the projects), almost all of my overridden methods are not formatted correctly, causing the error: The method must override a superclass method It may be noteworthy to mention this is with Android projects for whatever reason, the … Read more
If a constructor does not explicitly invoke a superclass constructor, the Java compiler automatically inserts a call to the no-argument constructor of the superclass. If the super class does not have a no-argument constructor, you will get a compile-time error. Object does have such a constructor, so if Object is the only superclass, there is … Read more
