Declare a variable with an explicit type hint and an initial value.

Inform readers and static type checkers that the variable holds a fixed set of integer coordinate pairs, enabling IDE assistance and bug prevention.

When a fixed set of integer coordinate pairs is needed, e.g., defining fixed waypoints, obstacle cells, or sprite pixels in a grid‑based application.

Appears in game development, graphics, grid algorithms, geometry utilities, or any Python module that benefits from static typing of coordinate sets.

<variable>: Set[Tuple[int, int]] = {(int, int), ...}

variable: Set[Tuple[int, int]] = {(int, int), ...}

variable_name element_type set_elements

• coordinates points grid position set tuple

• points: Set[Tuple[float
• float]] = {(0.0
• 0.0)
• (1.0
• 1.0)} obstacles: Set[Tuple[int
• int]] = {(2
• 3)
• (5
• 7)}

forgetting to import Tuple and Set from typing (Python <3.9) using list syntax [] instead of set {} missing commas between tuple elements

coordinates: List[Tuple[int, int]] = [(0,0),(1,1)] coords_map: Dict[Tuple[int, int], str] = {(0,0):'origin', (1,1):'diag'} point: Tuple[int, int] = (0,0)

Confusing with TypeScript syntax: let coordinates: [number, number][] = [[0,0],[1,1]]; Confusing with C# syntax: var coordinates = new HashSet<(int,int)>{(0,0),(1,1)};

• coordinates: List[Tuple[int
• int]]
• coords_dict: Dict[Tuple[int
• int]
• int]
• point: Tuple[int
• int]

The set itself is mutable; its elements are immutable tuples. To make the reference immutable, wrap it in typing.Final or use a constant naming convention.

Signals to readers and static analysers that the variable holds a fixed set of integer coordinate pairs, enabling IDE autocomplete, refactoring safety, and early type‑error detection.

Think of a set of grid points.

For Python <3.9, import Tuple and Set from the typing module; from Python 3.9+ the built‑in collection types can be used directly (e.g., set[tuple[int, int]]).

coordinates: List[NamedTuple('Point', [('x', int), ('y', int)])] = [Point(0,0), Point(1,1)]