指定PyYAML转储(II)部分的样式:序列 [英] Specifying styles for portions of a PyYAML dump (II): sequences
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问题描述
考虑以下代码作为输入手动格式化的YAML数据。我正在修改YAML数据,但希望在写入的YAML文件中保留单行的边缘。
import yaml
st2 = yaml.load(
edges:
- [1,2]
- [2,1,[1,0]]
print yaml.dump(st2)
$ b $ class blockseq(dict):pass
def blockseq_rep(dumper,data):
return dumper。表达式映射(u'tag:yaml.org,2002:seq',data,flow_style = False)
类流程图(dict):pass
def flowmap_rep(dumper,data):
return dumper.represent_mapping(u'tag:yaml.org,2002:map',data,flow_style = True)
class blockseqtrue(dict):pass
def blockseqtrue_rep(dumper,数据):
return dumper.represent_mapping(u'tag:yaml.org,2002:seq',data,flow_style = True)
yaml.add_representer(blockseq,blockseq_rep)
yaml.add_representer(blockseqtrue,blockseqtrue_rep)
yaml.add_representer(flowmap,flowmap_rep)
st2 ['edges'] = [blockseqtrue(x)for x in s t2 ['edges']]
print yaml.dump(st2)
此脚本退出以下输出显示错误:
边缘:
- [1,2]
- - 2
- 1
- [1,0]
Traceback(最近一次调用最后一次):
文件test-yaml-rep.py,第42行,在< module>
st2 ['edges'] = [blockseqtrue(x)for st2 ['edges']]
TypeError:无法将字典更新序列元素#0转换为序列
解决方案您的问题是,我有两个类都操作在字典,而不是列表。你想要的东西,将与列表:
class blockseqtrue(list):pass
def blockseqtrue_rep(dumper,data ):
return dumper.represent_sequence(u'tag:yaml.org,2002:seq',data,flow_style = True)
Python列表是YAML序列/ seqs。 Python字典是YAML映射/地图。
This is a follow up question to Specifying styles for portions of a PyYAML dump:
Consider following code contaning as input manually formatted YAML data. I am modifying the YAML data, but would like to keep edges on single lines in the written YAML file.
import yaml
st2 = yaml.load("""
edges:
- [1, 2]
- [2, 1, [1,0]]
""")
print yaml.dump(st2)
class blockseq( dict ): pass
def blockseq_rep(dumper, data):
return dumper.represent_mapping( u'tag:yaml.org,2002:seq', data, flow_style=False )
class flowmap( dict ): pass
def flowmap_rep(dumper, data):
return dumper.represent_mapping( u'tag:yaml.org,2002:map', data, flow_style=True )
class blockseqtrue( dict ): pass
def blockseqtrue_rep(dumper, data):
return dumper.represent_mapping( u'tag:yaml.org,2002:seq', data, flow_style=True )
yaml.add_representer(blockseq, blockseq_rep)
yaml.add_representer(blockseqtrue, blockseqtrue_rep)
yaml.add_representer(flowmap, flowmap_rep)
st2['edges'] = [ blockseqtrue(x) for x in st2['edges'] ]
print yaml.dump(st2)
This script exits with following output showing an error:
edges:
- [1, 2]
- - 2
- 1
- [1, 0]
Traceback (most recent call last):
File "test-yaml-rep.py", line 42, in <module>
st2['edges'] = [ blockseqtrue(x) for x in st2['edges'] ]
TypeError: cannot convert dictionary update sequence element #0 to a sequence
解决方案 Your problem is that the two classes I had both operate on dicts, not lists. You want something that will work with lists:
class blockseqtrue( list ): pass
def blockseqtrue_rep(dumper, data):
return dumper.represent_sequence( u'tag:yaml.org,2002:seq', data, flow_style=True )
Python lists are YAML sequences / seqs. Python dicts are YAML mappings/maps.
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