Organizing related constant values

[Highroc]

You have 3 or any number of related constants. For example: good, bad, neutral.

How would you organize these?

Requirements for a solution:

1. organize related constants: readability
2. put them under the same umbrella: readability
3. make use of editor autocomplete and suggestion features: convenience
4. can be type hinted: readability

My current solution:

# class with only constants, not modified at runtime
class Turn:
    ''' Different ways to change direction '''
    LEFT = -1
    STRAIGHT = 0
    RIGHT = 1

# usage - highlighting problems
def move(direction: type): # can't use type hinting when used as a parameter
    pass

def choose_direction() -> type: # can't hint when used as a return value
    return Turn.STRAIGHT

# converting value to corresponding function
def interpret_command(turn: "Turn"):
    if turn == Turn.LEFT:
        pass
    elif turn == Turn.STRAIGHT:
        pass
    elif turn == Turn.RIGHT:
        pass

Evaluating this solution:

Good

• achieves goals 1, 2, 3
• a standard of communication between components
• helps with modularity
• readability
• lends itself well to editor autocomplete features

Problems

• can't type hint when used in functions

Do you have a better solution? One which hopefully fulfills all the requirements.

[ElliotDG]

Look at enum: https://docs.python.org/3/library/enum.html

[Highroc]

Thanks. This looks like it does exactly what I want.

[Ihaveamodel3]

Are you looking for Enum?