Returning True if a value is present in an enum; returning false if not [duplicate]

Question

I apologise if I'm missing anything obvious; is there a way to see if a value is in an enum which returns True if it is, False if not? For example, if I take the following enum from the python documentation,

from enum import Enum
class Colour(Enum):
     RED = 1
     GREEN = 2
     BLUE = 3

is there any way to do the following action, or an equivalent, without an exception being raised:

colour_test = "YELLOW"
if Colour[colour_test]:
    print("In enum")
else:
    print("Not in enum")
## Output wanted - "Not in enum"
## Actual output - KeyError: "YELLOW"

I know that I can use try;except statements, but I'd prefer not to in this situation as I'd like to use this conditional with some others.

Answer 1

Enums have a __members__ dict that you can check:

if colour_test in Colour.__members__:
    print("In enum")
else:
    print("Not in enum")

You can alternatively use a generalized approach with hasattr, but this returns wrong results for some non-members like "__new__":

if hasattr(Colour, colour_test):
    print("In enum")
else:
    print("Not in enum")

Answer 2

if colour_test in Colour.__members__:
    print("In enum")
else:
    print("Not in enum")