从超类调用子类的方法

Question

I am a bit new to Python inheritance.

I want a subclass to inherit from a superclass, and I want a method in the superclass to call a method in the subclass.

In Ruby, this works fine:

class A
  def foo
    self.bar
  end
end

class B < A
  def init
    foo
  end

  def bar
    puts "I, Bar"
  end
end

B.new.bar

When I run this, I see "I, Bar", as I expected.

In Python, however, what I thought to be equivalent code behaves strangely:

class A:
    def foo(self):
        self.bar()

class B(A):
    def __init__(self):
        self.foo()

    def bar(self):
        print "I, Bar"

B().bar()

When I run that I see printed twice "I, Bar".

How can I rewrite the Ruby code in Python? Is it possible, and if so, what am I doing wrong?

Answer 1

In Python __init__ method is normally called whenever an object is created like initialize in Ruby. So rename your __init__ method in an other name.

I think you mistyped init instead of initialize in your Ruby code.