Convert an enum to a list in Python

Question

I have an enum that I define like this:

def make_enum(**enums):
    return type('Enum', (), enums)

an_enum = make_enum(first=1, second=2)

At some later point I would like to check, if a value that I took as a parameter in a funciton is part of an_enum. Usually i would do it like this

assert 1 in to_list(an_enum)

How can I convert the enum object an_enum to a list? If that is not possible, how can I check if a value "is part of the enum"?

Answer 1

How can I convert the enum object an_enum to a list?

>>> [name for name in dir(an_enum) if not name.startswith('_')]
['first', 'second']

How can I check if a value "is part of the enum"?

>>> getattr(an_enum, 'first')
1
>>> getattr(an_enum, '1')
Traceback [...] 
AttributeError: type object 'Enum' has no attribute '1'