![]() ![]() If you do get an answer elsewhere, please write back here to let usīy the way, you have this in your code: if ext is None:Īssertions can be turned off by the caller, which will disable theĮven if the assertion is tried, if it fails, it gives the wrongĮxception (an AssertionError instead of a TypeError). Where the something else is of a different type to the overridden Or look for aĬase where an overridden method does something like if condition: Probably get better help from a mypy or typeshed forum. I’m not an expert on Python’s type hinting mini-language. Is that right? Essentially you want to extend the existing return typeįrom open by unioning that with GzipFile etc. #Python type annotations plusSo effectively you are asking for a way to tell the type checker, thisįunction can return anything that open can return, plus these things. python type annotationsannotation type of collection pythonpython optional type annotationtypescript object annotationtypescript type annotation in. It might be that the best way to write an accurate typeĪnnotation for the return result is that gigantic mess. Here's what optional from future import annotations changes in python 3.7+: class A: def f (self) -> A: NameError: name 'A' is not defined pass. #Python type annotations codeI’m sure that it’s not a gigantic mess for fun, or because of It's an enhancement to the existing annotations feature which was initially introduced in python 3.0 and redefined as type hints in python 3.5, that's why your code works under python 3.8. What’s the best way to write accurate type annotations for this sort of function? The problem is, first, that what the typeshed says for the built-in open is a gigantic mess that I don’t want to copy into my code, and second, that even small subsets of it don’t work: for instance if I change the return type to IO then I get test.py:25: error: Incompatible return value type (got "Union", expected "IO") ![]() Return lzma.open(name, mode, format=lzma.FORMAT_ALONE, **kwargs) Return lzma.open(name, mode, format=lzma.FORMAT_XZ, **kwargs) When 'name' is actually a file-like object). Supplied, it overrides the extension on 'name' (this is useful ![]() """Open a file, automatically compressing or decompressing it whenĬompression is indicated by the file extension. I’d like to make the type annotations for this function more specific: def open_with_auto_compression(name: Any, ![]()
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