class - How does this use of Python's __metaclass__ work? -

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I got a presentation about generator and functional programming. I stumbled on __ metaCLASS__

  1. Why the argument of genuine and float Accounting? Usually there is base , but is it necessary to type in real and float ?

  2. What does __bastmethods __ do? I can not find it in the general list of special methods.

  3. Does the author enrich his own accounting class by using those two methods of classes, with the ways of other sections, loops?

  4. Why does account (getattr (float, meth) (* args, ** kwargs)) The result is not in the infinite loop? Unlike the second edition, what happens here? First of all, it is a fraction that is relevant to my question: 

      class accounting (

    5. Real, float): def __metaclass __ (name, base, body): for the method in real .__ abstractmethods__: If the method is not in the body: body [method] = (Lambda meth: lambda * args, * * quarwiz: method For the method in ('__ne __', '__najiro_',)) (method (float, meth) (* args, ** quargas)) (method): If the method is not in the body: body [method] = (Lambda Eith: lambda * algés, ** quarz: gator (float, meth) (* args, ** quorz)) (method) react real .__ metaclass __ (name, bass, body) __new__ = float .__ new__ 

     : in real .__ abstractmethods__ For the method: If the method is not in the body: (for method in '__ne __', '__ nozerza') [method] = (Lambda meth: lambda * algés, ** quarj: ac Accounting (Gator (float, meth) (* ARG, ** quarj))): (If method is not in the body: body [method] = (Lambda meth: lambda * algés, ** quarrels: gator (Float (Math, FMT): Returns {1: '% s'% Float .__ format __ (Self, FMT), 0: '% s'% float .__ format __ (self, fmt): __new__ = float .__ new__def __format__ (self, fmt) (' 0 ',' - '), -1:' (% s ) '% Float .__ format __ (self, FMT)} [C Mpi (Self, 0)]

    The code used here: 

      template = "{field: & lt; {Align}} {Benefits: & gt; 14, .0f} '. Format def production (market, write = print area (area) = (field = area, profit = gain, align = align) type (line) output () {field: accounting (p for field area, markets.items ()} )

    Output: 

      Central America (-675,140) US (-2,724,620) Antarctica - Asia (-3,614,396) UK (-2,380,001) European Answer: Answer: Answer:    
     
     Union 771,665 CEMEA 3,480,172
    Code> Reason for Real .__bstractmethods__: if the method Is not in body: body [method] = (lambda meth: lambda * args, ** kwargs: accounting (getattr (float, meth)) (* args, ** kwargs)) (method)

    numbers.Real is an abstract class (i.e. you can not prove an example of this, but you can use it as a sub-class. Real class has a special frozenet which is __bittalmuptens __ is called , which lists all the methods that expect to define the actual class. :

    In the Interactive Interpreter: Import Real Real from Numbers <__> , '' ___ ',' ___ ',' ___ ',', '__le__', 'metaclass') is a solid definition for each of these methods

    I will accept that I have nested lambda definition I do not completely mess up.


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