In this post, we will see how to resolve Is there a way to please the type checker other than isinstance? Question: How can I check which subclass an instance belongs to, without using isinstance? (My understanding is that using ...
In this post, we will see how to resolve Type one of several classes Question: Let’s say I have the following two classes: How would I make the type one of the Expr or Literal class? The full example of ...
In this post, we will see how to resolve How would I constrain a method to only return one of a set of specific values in python? Question: Is there a pythonic way to constrain the output of a method ...
In this post, we will see how to resolve Generic ParamSpec on Python 3.9 Question: The following is correct in Python 3.10, but not 3.9: Running the above triggers a TypeError: What must I do to get this piece of ...
In this post, we will see how to resolve How to typehint dynamic class instantiation like pydantic and dataclass? Question: Both Pydantic and Dataclass can typehint the object creation based on the attributes and their typings, like these examples: With ...
Question: I have a function that reads a version.py and returns the version val. The function looks like this: The version.py script looks like this: The type for VERSION["VERSION"] is an str. However, I keep getting the error: Returning Any ...
Question: I’m in the following situation: For the above example, Rust can correctly infer types T, F, and S, but not K (as is expected). Is there a way to only specify the type of K when calling some_fn without ...
Question: Below method has many potential return types based on values in a dictionary; The types I have available in my config file are limited to those specified above but at what point is list specific types redundant? Should I ...
Question: Consider the code bellow. Is it possible to infer the concrete type stored in T in the A.foo() class method? This is a rather generic (sic) example. A real-world use case would be to implement a generic constructor which ...
Question: I want to count the value of the key dictionary. I understood Counter in typing module ignore the element with value 0. The code is: The output is {‘cost’:40} and Counter ignores the element with count 0. I want ...