我一直在尝试与PyYAML接触，因为我喜欢它的可读性，并且希望在一些我正在替代JSON的开源项目中使用它。
但是，我正在努力了解如何确切地构造具有合成的对象。我打开了一个问题：PyYAML - how to deal with compositon，它似乎在读取信息方面有效，但在整个程序范围内无效。
这是我尝试YAMLify的精简示例：
import yaml
import data
class DungeonObject(yaml.YAMLObject):
yaml_tag = u'!DungeonObject'
def __init__(self, x, y, char, name, blocks=False, fighter=None):
self.x = x
self.y = y
self.char = char
self.name = name
self.blocks = blocks
self.fighter = fighter
if self.fighter:
self.fighter.owner = self
def __repr__(self):
return "%s(x=%r, y=%r, char=%r, name=%r, blocks=%r fighter=%r)" % (self.__class__.__name__, self.x, self.y, self.char, self.name, self.blocks, self.fighter)
class Fighter(yaml.YAMLObject):
yaml_tag = u'!Fighter'
#combat-related properties and methods (monster, player, NPC).
def __init__(self, hp, defense, strength):
self.hp = hp
self.base_defense = defense
self.base_strength = strength
def __repr__(self):
return "%s(hp=%r, defense=%r, strength=%r)" % (self.__class__.__name__, self.hp, self.defense, self.strength)
monsters = {DungeonObject.name : DungeonObject for DungeonObject in yaml.load_all(data.monsterdata)}
print (monsters)
和我的YAML文件：
monsterdata = """
---
!Fighter &fighter_component
hp: 20
defense: 0
strength: 4
!DungeonObject
x: x
y: y
char: 'o'
name: 'orc'
blocks: True
fighter: fighter_component
---
!Fighter &fighter_component
hp: 9
defense: 0
strength: 10
!DungeonObject
x: x
y: y
char: 't'
name: 'troll'
blocks: True
fighter: fighter_component
"""
有了这个，我得到了错误：
第32行，在
monsters = {DungeonObject.name：yaml.load_all（data.monsterdata）中DungeonObject的DungeonObject}
AttributeError：“ Fighter”对象没有属性“ name”
最佳答案
每个文档应包含由Fighter和DungeonObject组成的序列/列表。前者没有名称，因此您应该过滤DungeonObject类型而不是Fighter类型的DungeonObject。
有点令人困惑的是，您也使用了变量DungeonObject，因此请尝试对变量使用dungeon_object：
from ruamel import yaml
monsterdata = """
---
- !Fighter &fighter_component
hp: 20
defense: 0
strength: 4
- !DungeonObject
x: x
y: y
char: 'o'
name: 'orc'
blocks: True
fighter: fighter_component
---
- !Fighter &fighter_component
hp: 9
defense: 0
strength: 10
- !DungeonObject
x: x
y: y
char: 't'
name: 'troll'
blocks: True
fighter: fighter_component
"""
class DungeonObject(yaml.YAMLObject):
yaml_tag = u'!DungeonObject'
def __init__(self, x, y, char, name, blocks=False, fighter=None):
self.x = x
self.y = y
self.char = char
self.name = name
self.blocks = blocks
self.fighter = fighter
if self.fighter:
self.fighter.owner = self
def __repr__(self):
return "{}(x={!r}, y={!r}, char={!r}, name={!r}, blocks={!r} fighter={!r})".format(
self.__class__.__name__, self.x, self.y, self.char, self.name,
self.blocks, self.fighter)
class Fighter(yaml.YAMLObject):
yaml_tag = u'!Fighter'
# combat-related properties and methods (monster, player, NPC).
def __init__(self, hp, defense, strength):
self.hp = hp
self.base_defense = defense
self.base_strength = strength
def __repr__(self):
return "{}(hp={!r}, defense={!r}, strength={!r})".format(
self.__class__.__name__, self.hp, self.defense, self.strength)
monsters = {}
for doc in yaml.load_all(monsterdata, Loader=yaml.Loader):
for dungeon_object in doc:
if isinstance(dungeon_object, DungeonObject):
monsters[dungeon_object.name] = dungeon_object
print (monsters)
这使：
{'orc': DungeonObject(x='x', y='y', char='o', name='orc', blocks=True fighter='fighter_component'), 'troll': DungeonObject(x='x', y='y', char='t', name='troll', blocks=True fighter='fighter_component')}
我更新了
__repr__以使用更现代的.format()方法。由于我正在使用ruamel.yaml（这是PyYAML功能的超集，并且向后兼容），因此我需要明确指定Loader，以抑制使用默认加载器时load_all不安全的警告。 （免责声明：我是该软件包的开发人员）关于python - PyYAML和组成，属性错误，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/42251684/