Class[_] equivalent in python

Question

I want to perform the following scala code into python3 language

    class xyz{  
      def abc():Unit={  
        val clazz:Class[_] = this.getClass()
        var fields: List[String] = getFields(clazz);
        val method = clazz.getDeclaredMethods()
        val methodname=method.getName()
        val supper= clazz.getSuperclass()
        println(clazz)
        println(fields)
        println(method)
}}

Well, `abc()` is an infinite loop without side-effects and `mno()` prints `"hello"`. Are you sure this is the code you want to translate? — Mateusz Kubuszok, May 27 '20 at 11:21
method name and class name is random just for reference ......main part,of which I want conversion is written in abc()....I am kind of new for python language and why abc() is infinite loop — creatorworld, May 27 '20 at 11:24
`abc()` in its current form is just `while True: pass` with extra steps. I am almost certain this is not what you want. — Mateusz Kubuszok, May 27 '20 at 12:10
I have edited the post.....whatever task is performed here I just want to perform it in python..........equivalent for getClass(), for getFields() etc — creatorworld, May 27 '20 at 13:52

score 3 · Answer 1 · answered May 27 '20 at 12:27

Class[_] equivalent in python

Class[_] is a static type. Python doesn't have static types, so there is no equivalent to the static type Class[_] in Python.

I want to perform the following scala code into python3 language

class xyz{  
 def abc():Unit={  
   val clazz:Class[_] = this.getClass()
   var fields: List[String] = getFields(clazz);
   val method = clazz.getDeclaredMethods()
   val methodname=method.getName()
   val supper= clazz.getSuperclass();}
 def mno():Unit={
   println("hello")}}

abc is simply a NO-OP(*). mno just prints to stdout. So, the equivalent in Python is

class xyz:
  def abc(self):
    pass

  def mno(self):
    print("hello")

Note that I made abc and mno instance methods, even though it makes no sense. (But that's the same for the Scala version.)

(*) Some who knows more about corner cases and side-effects of Java Reflection can correct me here. Maybe, this triggers some kind of Classloader refresh or something like that?

please see the post again .........I have done some editing. whatever value is returned by the methods used like getClass(), getFields() etc ......I want same kind of value using python — creatorworld, May 27 '20 at 13:55

score 2 · Answer 2 · answered May 27 '20 at 14:14

2

You can't get one-to-one correspondence simply because Python classes are organized very differently from JVM classes.

The equivalent of getClass() is type;
there is no equivalent to Class#getFields because fields aren't necessarily defined on a class in Python, but see How to list all fields of a class (and no methods)?.
Similarly getSuperclass(); Python classes can have more than one superclass, so __bases__ returns a tuple of base classes instead of just one.

answered May 27 '20 at 14:14

Alexey Romanov

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Also, there is no equivalent to `getDeclaredMethods` because methods are actually just (well, not quite, but close enough) functions assigned to fields (see #2). And there is no equivalent to `getName` because methods (functions) don't have names, they are simply objects assigned to variables / fields (see #2 again). – Jörg W Mittag May 27 '20 at 14:51

Class[_] equivalent in python

2 Answers2