Used since the early 20th century and popularized by The Hitchhiker's Guide to the Galaxy and The Simpsons, the theorem has been a prominent subject of memes and references online since the late-2000s. Infinite Monkey Theorem is a theorem that states that an unlimited number of monkeys hitting random keys on typewriters for an infinite amount of time will almost surely type out any given text, such as the complete works of William Shakespeare. On the Python Ideas list: Ian Bicking in 2007: īeta Was this translation helpful? Give feedback.Infinite monkey theorem, typewriter, monkey, william shakespeare, mathematics, probability theory, monkey typing meme, chimpanzee typewriter, ape typing, monkeys, apes, comics.Mypy issue from 2018, in which mentions having considered it: Allow adding attributes to classes after definition mypy#5363.Variations of this pattern have come up in the past, sometimes referring to Ruby's class extensions: Use the above approach with keeping related functionality all in one file while also having a Pythonic API in usage.īut this approach no longer works with the introduction of type hinting, so I'm hoping for another way to organise that checks all the boxes: easy to read and maintain, nice API to use, and mypy-compatible. # Nicer call: # parent.refresh_children() route( '/refresh/', methods =) def refresh_parent( parent_id: int): This keeps related functionality in the same file and in the same class, but feels unpythonic in app. However, the method itself depends on the structure of ChildModel, and if I have multiple types of child models, all with their own support functions, it becomes hard to understand as related functionality is now spread across files, apart from also causing circular imports.ĭefine a classmethod on ChildModel with a signature like def refresh_parent(cls, parent: ParentModel). If I need a parent.refresh_children() method, I could:ĭefine it in the ParentModel class. SQLAlchemy has back-references that allow a ChildModel model class to create a collection on a ParentModel model class (like ParentModel.children), but no mechanism for injecting methods. I have ORM models representing one-to-many (or parent-child) relationships that are split across files. The reopen mechanism came up as a coping strategy for SQLAlchemy models. Can this be addressed with a mypy plugin, as happens with enums and dataclasses, or is this sort of distributed class definition too complex for mypy? Why do this? I'm aware monkey patching and static type analysis don't get along, so I'm wondering how to reorganise without littering my code with cast and # type: ignore. I can workaround this by using cast(ImportedClass, self), but mypy also does not recognise ImportedClass.new_method to exist, so downstream code will get flagged.If I change the signature to def new_method(self: ImportedClass) -> int, it will raise an error for the erased type of self ImportedClass not being a superclass of Temporar圜lass.In new_method it will raise an error about Temporar圜lass not containing existing_attribute.The problem is that mypy does not actually recognise the patching, so I get other errors: The decorator is also typed to indicate it replaces the decorated value with its parameter so that the assert passes type checking. Using the reopen decorator allows for cleaner, less surprising code, and the decorator adds safety checks over direct patching. Def new_method( self: ImportedClass) -> int:
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