How to Use IntEnum Arithmetic for Priority Levels in Python

Demonstrates Python IntEnum arithmetic for priority levels, showing how enum members behave like integers in calculations and comparisons.

Easy Python 3.9+ Aug 9, 2026 OOP & classes 13 views 0 copies

enum intenum priority oop

Python code

20 lines

Python 3.9+

from enum import IntEnum

class Priority(IntEnum):
    LOW = 1
    MEDIUM = 5
    HIGH = 10
    CRITICAL = 20

if __name__ == "__main__":
    current = Priority.MEDIUM
    boosted = current + 3
    lowered = current - 2
    doubled = current * 2

    print(f"Current: {current} ({current.value})")
    print(f"Boosted (+3): {boosted} ({boosted.value})")
    print(f"Lowered (-2): {lowered} ({lowered.value})")
    print(f"Doubled (*2): {doubled} ({doubled.value})")
    print(f"Can compare: {current > Priority.LOW}")
    print(f"Works with range: {list(range(Priority.LOW, Priority.HIGH + 1))}")

Output

stdout

Current: MEDIUM (5)
Boosted (+3): 8 (8)
Lowered (-2): 3 (3)
Doubled (*2): 10 (10)
Can compare: True
Works with range: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

How it works

IntEnum makes each member an actual int subclass, so arithmetic operators like +, -, and * return plain integers (not IntEnum instances). This is handy when you need numeric computations on enum values, though you lose the enum name after arithmetic. The if __name__ == "__main__": guard ensures the demo runs only when executed directly. Comparisons work naturally because enum members are also integers, enabling use with range and other numeric operations.

Common mistakes

Assuming arithmetic results remain `IntEnum` members (they become plain ints)
Forgetting to import `IntEnum` (using `Enum` instead, which does not support arithmetic)
Expecting `Priority.MEDIUM + 3` to yield `Priority.HIGH` if 8 existed; it doesn't auto-map to enum values

Variations

Use a custom `__add__` method on a regular `Enum` to return enum members for arithmetic
Use `enum.auto()` to assign sequential values automatically

Real-world use cases

Escalating a support ticket priority by adding a delta to the current `Priority` enum value.
Calculating resource allocation levels by weighting multiple `Priority` values in a scoring formula.
Filtering tasks by priority ranges in a scheduler using `range(Priority.LOW, Priority.HIGH + 1)`.

How to Use IntEnum Arithmetic for Priority Levels in Python

Python code

Output

How it works

Common mistakes

Variations

Real-world use cases

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How it works

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Variations

Real-world use cases

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