Add enum constructor to create enum from value

[aisk]

Thought we have a thrift file:

enum TestEnum {
    a = 1;
    b = 2;
}

It's common to create a enum from it's value like this:

a = TestEnum(1)

For now, the enum type do not accept any constructor parameters, can we add it like above, or generated a public api to do this convert?

[ethe]

Yes, I think it is better to have the same behavior as https://docs.python.org/3/library/enum.html

[seidefrank]

Is there a workaround? I need to use an API that, per .pyi file, expects an enum type, but I am only given an integer value. Is it possible to convert the int value to an instance of the Thrift-generated enum type? Thanks!

[truebit]

+1
Now thriftpy2 just treats thrift enum type to TType.I32.
I think we need to add a new TType ENUM.