Python print class member name from value

Question

I have a class with list of class members (variabls), each assigned to its own value.

class PacketType:
    HEARTBEAT      = 0xF0
    DEBUG          = 0xFC
    ECHO           = 0xFF

    @staticmethod
    def get_name(value):
        # Get variable name from value
        # Print the variable in string format
        return ???

If I call PacketType.get_name(0xF0), I’d like to get return as "HEARTBEAT".
Does python allow this, or is the only way to make list of if-elif for each possible value?

Asked By: tilz0R

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Source

Answer 1

Why not use dictionary to store packet types?

class PacketType:
    packets = {
        0xF0: 'HEARTHBEAT',
        0XFC: 'DEBUG',
        0XFF: 'ECHO'
    }

    @classmethod
    def get_name(cls, value):
        return cls.packets[value]

Answered By: Aiq0

Answer 2

The below works. (But I dont understand why you want to have such thing)

class PacketType:
    HEARTBEAT = 0xF0
    DEBUG = 0xFC
    ECHO = 0xFF

    @staticmethod
    def get_name(value):
        for k, v in PacketType.__dict__.items():
            if v == value:
                return k
        return None


print(PacketType.get_name(0xFF))

output

ECHO

Answered By: balderman

Python print class member name from value

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