D - Glossary (Python)

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declare

• means to tell a name existence to bytecode compiler so no memory allocation happens because an object isn't created:
  • E.g. v: int and def func(x: int) -> None: ....

  • define

  • means to declare, then to ask virtual machine to allocate memory in RAM for an object:
    • E.g. v: int = 100 and def func(x: int = 100) -> None: ....
  • includes the meaning of declare because for v: int = 100, we only say define but don't say declare, then define.

dynamic type

• is an implicit type always inferred by virtual machine at runtime.
• can be called runtime type but I use dynamic type because it's completely opposite to static type, which is more intuitive.