I am communicating with some hardware over an I2C bus. Every so often, there is an exception as the bus is busy so I am currently handling this with a loop that retries, but there’s a lot of code repetition, I want to tidy it up. So, I tried to write a decorator function to pass various functions to As
Tag: decorator
Python Decorator, Wrapper got argument multiple times
I wrote this decorator to be used by two functions: I keep getting the error: How can I pass the argument page recursively without having it multiple times? Thanks! EDIT: functions are called as in: Answer Positional arguments in python must be passed in order of definition in the function prototype. This lin…
Possible to create a @synchronized decorator that’s aware of a method’s object?
I’m trying to create a @synchronized wrapper that creates one Lock per object and makes method calls thread safe. I can only do this if I can access method.im_self of the method in the wrapped method. (1) What’s confusing is that the func parameter passed to my decorator changes type before it get…
Decorating a class to monitor attribute changes
I want to have classes that automatically send notifications to subscribers whenever one of their attributes change. So if I would write this code: The output would be: My question is how to implement the ChangeMonitor decorator class. In the above example I assume it will print a line indicating the changes …
How does the @property decorator work in Python?
I would like to understand how the built-in function property works. What confuses me is that property can also be used as a decorator, but it only takes arguments when used as a built-in function and not when used as a decorator. This example is from the documentation: property’s arguments are getx, se…
decorating decorators: try to get my head around understanding it
I’m trying to understand how to decorate decorators, and wanted to try out the following: Let’s say I have two decorators and apply them to the function hello(): Then I have to start adding other decorators for other functions, but in general the @wrap decorator will “wrap all of them”…
Can a decorator of an instance method access the class?
I have something roughly like the following. Basically I need to access the class of an instance method from a decorator used upon the instance method in its definition. The code as-is gives: AttributeError: ‘function’ object has no attribute ‘im_class’ I found similar question/answers…
How to get method parameter names?
Given that a function a_method has been defined like Starting from a_method itself, how can I get the argument names – for example, as a tuple of strings, like (“arg1”, “arg2”)? Answer Take a look at the inspect module – this will do the inspection of the various code objec…