How to write interface (contract) for object property (attribute) existence in python?
You don't need to create new interface or implement ABC. You can use @dataclass. I am using default code checker in pycharm (warnings are in comments).
from dataclasses import dataclass@dataclassclass MyType: my_prop: int@dataclassclass SomeType: my_prop_out: intdef my_func_ok(my_param: MyType) -> SomeType: some_type = SomeType(my_prop_out=my_param.my_prop) return some_typedef my_func_bad(my_param: MyType) -> SomeType: return my_param # this is not returning SomeTypemy_type = MyType() # this is expecting to set my_propmy_type = MyType(my_prop="sss") # this is expecting to set my_prop with int not strmy_func_ok(my_param=100) # this is expecting MyType objectmy_func_ok(my_param=MyType(my_prop=10)) # this is correct, no errorsI am adding picture of pycharm code checker warnings:
