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TheOther Key Features inWhat’s New In Python 3.10 contains the following code snippet:
from enum import Enumclass Color(Enum): RED = 0 GREEN = 1 BLUE = 2match color: case Color.RED: print("I see red!") case Color.GREEN: print("Grass is green") case Color.BLUE: print("I'm feeling the blues :(")However, the variablecolor is unknown, hence,NameError: name 'color' is not defined is shown. The solution is the declare acolor variable and assign it any of theColor enum values, like so:
from enum import Enumclass Color(Enum): RED = 0 GREEN = 1 BLUE = 2color = Color.BLUEmatch color: case Color.RED: print("I see red!") case Color.GREEN: print("Grass is green") case Color.BLUE: print("I'm feeling the blues :(")