Return a string or byte object from Enum class?

[Calab]

I wish to have a class that simply contains some values. I want to avoid using the .value attribute. In other words I want to use "class.my_enum" to get a value instead of "class.my_enum.value".

I have the following code that will always return a string.

from enum import Enum

class TestClass(str, Enum):
    str_value = "abc"
    byte_value = "abc".encode('latin-1')
    
    def __str__(self):
        return str.__str__(self.value)
    

x = TestClass.str_value
print(x)
print(type(x))

x = TestClass.byte_value
print(x)
print(type(x))

This returns my values TestClass.str_value and TestClass.byte_value as an enum that works like a string. Unfortunately, I need TestClass.byte_value to be a bytes object.

Something like this would do what I want, except that this would allow the values in the class to be altered.

class TestClass():
    str_value = "abc"
    byte_value = "abc".encode('latin-1')


x = TestClass.str_value
print(x)
print(type(x))

x = TestClass.byte_value
print(x)
print(type(x))

# This should cause an error
TestClass.str_value = 5
print(TestClass.str_value)

How can I return different value types and disallow changing of their values?