Web Reference: Oct 30, 2024 · This first part of this post explains why type-checking exists and what the abstraction of types enables. After some justification for type-theory, we delve deep into what types are and details on the common constructions. Jul 23, 2025 · The main purpose of type-checking is to check the correctness and data type assignments and type-casting of the data types, whether it is syntactically correct or not before their execution. Dec 11, 2023 · When CPython is building the program, how does it know which types the variables are if we don’t specify them? It doesn’t. All it knows is that the variables are objects. Everything in Python is an Object, until it’s not (i.e. it becomes a more specific type), that is when we specifically check it.
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