Py之utils：utils库的简介、安装、使用方法之详细攻略

1. from utils import enum
2. 
3. class Colors(enum.Enum):
4.     RED = 0
5.     GREEN = 1
6. 
7. # Defining an Enum class allows you to specify a few
8. # things about the way it's going to behave.
9. class Options:
10.         frozen = True # can't change attributes
11.         strict = True # can only compare to itself; i.e., Colors.RED == Animals.COW
12. # will raise an exception.
13. 
14. # or use the enum factory (no Options, though)
15. ColorsAlso = enum.enum("RED", "GREEN")