我目前正在从.yml文件中读取数据。文件内部是每个主条目的以下部分：
- !
name: Martial Focus
prerequisites:
tier1:
any:
Attribute:
- Attribute1:§ 1
- Attribute2:§ 1
Feat:
- Feat1
Other:
- Other Prerequisites
cost:
- 3
description: |
[...]
effect: |
[...]
我已经能够阅读所有数据，包括＆＃39;先决条件＆＃39;，但在这里我有一个特殊问题： 与其他数据一起，我能够访问子列表，它似乎与此不同：
＆＃34; any：＆＃34; part是可选的，所以它也可以说像
prerequisites:
tier1:
Attribute:
- Attribute1:§ 1
- Attribute2:§ 1
Feat:
- Feat1
Other:
- Other Prerequisites
读取.yml文件会将上面的部分转换为
'prerequisites': {
'tier1': {
'any': {
'Attribute': ['Attribute1:§ 1', 'Attribute2:§ 1'],
'Feat': ['Feat1'],
'Other': ['Other Prerequisites']
}
}
}
所以在我的代码中，对于每个＆＃34; tierX＆＃34;，我检查它是否包含一个键＆＃34; any：＆＃34;通过
if 'any' in tier:
# do the stuff to be done if 'any' exists
else:
# do the stuff to be done if it doesn't
但它似乎永远不会成真。因为＆＃34;属性：＆＃34;，＆＃34;壮举：＆＃34;和＆＃34;其他：＆＃34;也是可选的，我对if-else语句中的那些做同样的事情，但是对于那些没有else语句的人来说它们也是同样的问题。 您可以在下面找到我正在使用的代码。自从我今天开始使用python以来，它不会是最漂亮的，但我希望你能帮助我：
prerequisites = ""
tierNum = 0
for tier in data['prerequisites']:
tierNum += 1
thisTier = ""
if 'any' in tier:
print("'any' found!")
content = tier['any']
if 'Other' in content:
other = ""
for s2 in content['Other'][:-1]:
other += s2 + ", "
thisTier += "**" + other
if len(content['Other'][:-1]) == 0:
thisTier += str(content['Other'][-1:])
else:
thisTier += "or " + str(content['Other'][-1:])
if 'Attribute' in content:
attributes = ""
for s2 in content['Attribute'][:-1]:
attributes += s2 + ", "
if thisTier.length() == 0:
thisTier += "**" + attributes
else:
thisTier += ", or " + attributes
if len(content['Attribute'][:-1]) == 0:
thisTier += str(content['Attribute'][-1:])
else:
thisTier += "or " + str(content['Attribute'][-1:])
if 'Feat' in content:
feats = ""
for s2 in content['Feat'][:-1]:
feats += s2 + ", "
if thisTier.length() == 0:
thisTier += "**" + feats
else:
thisTier += ", or " + feats
if len(content['Feat'][:-1]) == 0:
thisTier += str(content['Feat'][-1:])
else:
thisTier += "or " + str(content['Feat'][-1:])
else:
content = tier
if 'Other' in content:
other = ""
for s2 in content['Other'][:-1]:
other += s2 + ", "
thisTier += "**" + other
if len(content['Other'][:-1]) == 0:
thisTier += str(content['Other'][-1:])
else:
thisTier += "or " + str(content['Other'][-1:])
if 'Attribute' in content:
attributes = ""
for s2 in content['Attribute'][:-1]:
attributes += s2 + ", "
thisTier += "**" + attributes
if len(content['Attribute'][:-1]) == 0:
thisTier += str(content['Attribute'][-1:])
else:
thisTier += "or " + str(content['Attribute'][-1:])
if 'Feat' in content:
feats = ""
for s2 in content['Feat'][:-1]:
feats += s2 + ", "
thisTier += "**" + feats
if len(content['Feat'][:-1]) == 0:
thisTier += str(content['Feat'][-1:])
else:
thisTier += "or " + str(content['Feat'][-1:])
prerequisites += "*Tier {0}:\n{1}\n".format(tierNum, thisTier)
prerequisites = prerequisites[:-1]
我正在做像content['Feat'][:-1]这样的事情，以获得除了最后一个元素之外的所有元素，所以我可以在最后一个元素前面添加", or "，如果有多个元素。
修改 我想要的输出类似于：
Prerequisites:
*Tier 1:
**Attribute1 1, or Attribute2 1
**Feat1
**Other Prerequisites
如果没有，
Prerequisites:
*Tier 1:
**Attribute1 1, or Attribute2 1, or Feat1, or Other Prerequisites
如果它没有
答案 0 :(得分：2)
您的问题是for tier in data["predicates"]遍历谓词字典的键，因此后续的if "any" in tier实际上会评估"any" in "tier1"，因为它总是错误的。
您要在此处测试的是"any" in data["predicates"]["tier1"]。使用词典（即映射）时，您必须区分key及其对应的value。
有趣的是，你已经适应了下一个级别：
# ...
content = tier['any']
if 'Other' in content:
other = ""
for s2 in content['Other']:
# ...
迭代字典的方法
d = {"key1":"value1", "key2":"value2", "key3":"value3"}
for key in d:
print(key)
# prints key1, key2, key3
for key in d.keys():
print(key)
# prints key1, key2, key3
for value in d.values():
print(value)
# prints value1, value2, value3
for item in d.items():
print(item)
# prints (key1,value1), (key2,value2), (key3,value3)
for key, value in d.items():
print(key)
print(value)
# prints key1, value1, key2, value2, key3, value3
由于您是Python的新手，并且不知道可能的内容，请允许我为您提供一个更优雅的解决方案，而不是所有重复的字符串操作：
import yaml
yamldata1 = r"""
- !
name: Martial Focus
prerequisites:
tier1:
any:
Attribute:
- Attribute1:§ 1
- Attribute2:§ 1
Feat:
- Feat1
Other:
- Other Prerequisites
cost:
- 3
description: |
[...]
effect: |
[...]
"""
yamldata2 = r"""
- !
name: Martial Focus
prerequisites:
tier1:
Attribute:
- Attribute1:§ 1
- Attribute2:§ 1
Feat:
- Feat1
Other:
- Other Prerequisites
cost:
- 3
description: |
[...]
effect: |
[...]
"""
def process(data):
output = ""
for tier_name, tier in data['prerequisites'].items():
output += f"* {tier_name}"
if 'any' in tier:
content = tier['any']
prerequisites = content.get('Other', []) + content.get('Attribute', []) + content.get('Feat', [])
if prerequisites:
output += "\n** " + " or ".join(prerequisites)
else:
content = tier
prerequisites = [content.get('Other', []), content.get('Attribute', []), content.get('Feat', [])]
for subset in prerequisites:
if subset:
output += "\n** " + " or ".join(subset)
return output
data = yaml.load(yamldata1)[0]
print(process(data))
print('#'*10)
data = yaml.load(yamldata2)[0]
print(process(data))