验证Python中的枚举成员

Question

In Python, I have an input (called input_var below) that I would like to validate against a enum (called Color below). Is the following way the recommended Pythonic approach?

from enum import Enum
class Color(Enum):
    red = 1
    blue = 2
input_var = 'red'
if input_var in Color.__members__:
    print('Everything is fine and dandy.')

Answer 1

Use the built-in hasattr() function. hasattr(object, name) returns True if the string name is an attribute of object , else it returns False .

Demo

from enum import Enum

class Color(Enum):
    red = 1
    blue = 2

input_var = 'red'

if hasattr(Color, input_var):
    print('Everything is fine and dandy.')

Output

Everything is fine and dandy.