以编程方式将模块/函数集转换为Python类 [英] Programmatically turn module/set of functions into a Python class

问题描述

假设我有一个文件，其中包含一堆方法，如bunk_methods.py:

Suppose I have a file with a bunch methods as bunch_methods.py:

def one(x):
  return int(x)

def two(y)
  return str(y)

是否有一种方法可以通过整体导入模块或选择方法来采用那组方法，然后将导入的方法转换为类?

Is there a way to take that group of methods by importing the module whole or select methods, and turn the imported into a class?

例如伪明智的

def make_class_from_module(which_module_or_listing_of_methods):
    class = turn_module_to_class(which_module_or_listing_of_methods)
    return class

如此

BunchClass = make_class_from_module(bunch_methods)

BunchClass = make_class_from_module(bunch_methods)

在我的脑海中听起来很合法，但是它可行吗?如果应该，我将如何开始做这样的事情?或者我有什么选择?

Sounds legit in my mind, but how viable is it? How would I begin to do something like this, if I should even, or what are my alternatives?

我为什么要这样做?目前，这是一种精神与心理上的交流.学习练习，但我要记住的具体用途是采用方法并创建 flask-classy FlaskView类.我想潜在地使用各种方法，并可能使用&通过FlaskView在不同的上下文中重复使用它们

Why would I want to do this? Right now it is a mental & learning exercise, but my specific use in mind is take methods and create flask-classy FlaskView classes. I'd like to potentially take a grab bag of methods and potentially use & reuse them in differing contexts with FlaskView

推荐答案

您还可以使用type元类解决此问题.使用type生成类的格式如下:

You can also solve this problem using the type meta-class. The format for using type to generate a class is as follows:

type(name of the class, 
   tuple of the parent class (for inheritance, can be empty), 
   dictionary containing attributes names and values)

首先，我们需要重新处理您的函数，以将类作为第一个属性.

First, we need to rework your functions to take a class as the first attribute.

def one(cls, x):
    return int(x)

def two(cls, y):
    return str(y)

将其另存为bundle_method.py，现在我们可以按以下方式构造我们的类了.

Save this as bunch_method.py, and now we can construct our class as follows.

>>> import bunch_methods as bm
>>> Bunch_Class = type('Bunch_Class', (), bm.__dict__)
>>> bunch_object = Bunch_Class()
>>> bunch_object.__class__
<class '__main__.Bunch_Class'>
>>> bunch_object.one(1)
1
>>> bunch_object.two(1)
'1'

有关元类的出色(且很长)指南，请参见以下文章. 什么是Python中的元类?

See the following post for a excellent (and long) guide on meta-classes. What is a metaclass in Python?

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