English 中文(简体)
验证对象实例在 Python 中符合 ABC 要求
原标题:Verifying that an object instance complies with ABC in Python
I have an API that receives a serialized representation of an object that I expect to comply with a particular interface (known at development time). The serialized data I receive includes details that are used to create implementations of the methods/properties of this interface, so the actual object gets constructed at runtime; however, method names, signatures, property types, etc. are expected to match those known from the interface at development time. I would like to be able to construct this object at runtime, and then verify interface compliance, preferably failing immediately once an invalid object is constructed, not just when I try to invoke a method that s not there. I am new to Python, so I am not sure if there is an idiomatic way of doing such a check. I have investigated using Abstract Base Classes, and annotating my constructed object with such a class. Using annotations is convenient during development time because I can get intellisense in VSCode, but they are not used to verify that my constructed object implements the ABC correctly at runtime - for example, when it is passed into a method as a parameter, like this: def my_method(self, generated_object: MyABC): Is there another approach to doing what I have described (casting/coercing to the ABC, or perhaps using a different language feature)? Or is my best bet to implement my own validator that will compare the methods/properties on the constructed object vs those on the ABC?
问题回答
import abc class Base(abc.ABC): @abc.abstractmethod def i_require_this(self): pass class Concrete(Base): def __init__(self): return concrete = Concrete() TypeError: Can t instantiate abstract class Concrete with abstract methods i_require_this




相关问题
Can Django models use MySQL functions?

Is there a way to force Django models to pass a field to a MySQL function every time the model data is read or loaded? To clarify what I mean in SQL, I want the Django model to produce something like ...

An enterprise scheduler for python (like quartz)

I am looking for an enterprise tasks scheduler for python, like quartz is for Java. Requirements: Persistent: if the process restarts or the machine restarts, then all the jobs must stay there and ...

How to remove unique, then duplicate dictionaries in a list?

Given the following list that contains some duplicate and some unique dictionaries, what is the best method to remove unique dictionaries first, then reduce the duplicate dictionaries to single ...

What is suggested seed value to use with random.seed()?

Simple enough question: I m using python random module to generate random integers. I want to know what is the suggested value to use with the random.seed() function? Currently I am letting this ...

How can I make the PyDev editor selectively ignore errors?

I m using PyDev under Eclipse to write some Jython code. I ve got numerous instances where I need to do something like this: import com.work.project.component.client.Interface.ISubInterface as ...

How do I profile `paster serve` s startup time?

Python s paster serve app.ini is taking longer than I would like to be ready for the first request. I know how to profile requests with middleware, but how do I profile the initialization time? I ...

Pragmatically adding give-aways/freebies to an online store

Our business currently has an online store and recently we ve been offering free specials to our customers. Right now, we simply display the special and give the buyer a notice stating we will add the ...

Converting Dictionary to List? [duplicate]

I m trying to convert a Python dictionary into a Python list, in order to perform some calculations. #My dictionary dict = {} dict[ Capital ]="London" dict[ Food ]="Fish&Chips" dict[ 2012 ]="...

热门标签