helpers.py 文件源码

def enum_column(enum_cls, name, metadata):
    class EnumColumn(_BaseEnumColumn):
        pass

    EnumColumn.enum_cls = enum_cls

    # Just as tables do, enum columns require metadata to bind to.
    EnumColumn.impl = ENUM(*(e.value for e in enum_cls), name=name, metadata=metadata)

    EnumColumn.reverse_enum_values = {e.value: e for e in enum_cls}
    EnumColumn.__name__ = str('EnumColumn_' + name)
    return EnumColumn()