Immutable Coordinates

Medium ⏱ 12 min 46% acceptance ★★★★☆ 4.3

Define Coord as a frozen dataclass with lat: float and lon: float — assignment after construction must raise — and write try_move(c) that attempts c.lat = 0 and returns 'immutable' when the expected FrozenInstanceError/AttributeError fires. Frozen dataclasses are also hashable, so they work in sets.

Examples

Example 1

Input

try_move(Coord(12.9, 77.6))

Output

'immutable'

Explanation

Frozen instances reject attribute assignment.

Constraints

@dataclass(frozen=True).
Catch the exception in try_move.

Topics

OOPfrozen dataclass

Companies

GoogleUberMapbox

Hints

Hint 1

dataclasses.FrozenInstanceError subclasses AttributeError.

Hint 2

Catching AttributeError covers it.

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