您的Enum在3个地方丢失了订单。首先，将类主体上的属性存储在字典中，然后将项目复制到另一个字典中。最后，您
values()将返回第三个字典。字典不保存顺序，并且不可能在类主体中获得属性的顺序。
有了这个系统，最简单的就是拥有一个变量
__ordering__ = [ 'single', 'double' ]
并将
values()返回值作为元组列表（如
dict.items()）。
class Enummeta(type): def __new__(typ, name, bases, attrs): cls_attrs = {} cls_choices = {} for attr_name, value in attrs.items(): cls_attrs[attr_name] = attr_name.lower() if not attr_name.startswith("__"): cls_choices[attr_name.lower()] = value ordering = attrs.get('__ordering__') if ordering == None: ordering = sorted(cls_choices.keys()) def choices(cls): return dict(cls_choices) def values(cls, value=None): if value is None: return [ (k, cls_choices[k] ) for k in ordering ] elif not isinstance(value, basestring): return [ (k, cls_choices[k] ) for k in value ] else: return unipre(cls_choices.get(value)) def keys(cls, nil=False): items = list(ordering) if nil: items.append('') return items def combined_length(cls): return len(",".join(cls.values().keys())) def max_length(cls): return max(map(len, cls.values().keys())) cls_attrs['choices'] = classmethod(choices) cls_attrs['values'] = classmethod(values) cls_attrs['keys'] = classmethod(keys) cls_attrs['combined_length'] = classmethod(combined_length) cls_attrs['max_length'] = classmethod(max_length) return type(name, bases, cls_attrs)class SideHemType: __ordering__ = ['double', 'single'] __metaclass__ = Enummeta Single = "Single side hem for opaque fabrics" Double = "Double side hem for transparent fabrics"print SideHemType.keys()print SideHemType.values()
