<p>您的例子是一个奇怪的,如果不是一个无效的YAML文件,这使得它有点猜测工作在这里发生了什么。它是一个有问题的YAML文件的原因是</p>
<pre><code>LFSDetails: |
</code></pre>
<p>与前后行相比,具有不同缩进(即突出)的线条。在</p>
<p>在<code>LFSDetails</code>之前,YAML文件看起来像是在顶层有一个映射。所以最初的解决方案可能是用两个空格将<code>LFSDetails</code>压入,使其与之对齐。这将导致一个空字符串作为其文本块标量(用<code>|</code>引入),并且您的代码似乎依赖于YAML中的文本块YAML。所以看起来<code>LFSDetails</code>后面所有行后面的缩进都是正确的。在</p>
<p>要显示错误消息,您的YAML文件必须以短划线(顺序指示器)开头,缩进3个空格:</p>
^{pr2}$
<p>给出这个错误(我去掉了不相关的中间映射项)。但是,这将解析,但在输出后完全删除<code>LFSDetails</code>¹的任何内容:</p>
<pre><code>import ruamel.yaml as yaml
yaml_str = """\
-
Version: 1
LFSDetails: |
PriceInfos:
- {FaresRef: [1,2],Price: {Total: 1574.14},Amount: {Total: 1368.00},Taxes: {Total: 206.14},Surcharges: {Total: 0.00},Fees: {Total: 0.00}}
"""
for data in yaml.load_all(yaml_str):
print(data)
print data['LFSDetails']
</code></pre>
<p>给你:</p>
<pre><code>[{'Version': 1}]
Traceback (most recent call last):
File "try.py", line 54, in <module>
print data['LFSDetails']
TypeError: list indices must be integers, not str
</code></pre>
<p>由于破折号,以<code>Version:</code>开头的映射是序列/列表的第一个元素,然后尝试使用字符串(<code>LFSDetails</code>)访问列表元素会得到错误。在</p>
<p>因此,您应该<strong>首先清理您的山药,使其正确</strong>。我还建议包括<a href="http://yaml.org/spec/1.2/spec.html#id2760395" rel="nofollow">start of document marker</a>(<code> -</code>),即使示例文件中只有一个文档,因为您使用的是<code>load_all()</code>。并去掉多余的缩进(即从行的第一列开始)。删除任何虚假序列后,开始破折号并得到如下结果:</p>
<pre><code>import ruamel.yaml as yaml
yaml_str = """\
-
Version: 1
TxnCode: MPT
MessageID: "FFH-18544-1388620740-795905"
Recommendations:
- {ReqSegFlightRef: [[1,2]],TotalPriceRef: 1,PriceInfoRef: 1}
- {ReqSegFlightRef: [[3,4,2]],TotalPriceRef: 2,PriceInfoRef: 2}
- {ReqSegFlightRef: [[5,4,2]],TotalPriceRef: 3,PriceInfoRef: 3}
Flights:
- {OpCarrier: SN,MktCarrier: SN,FlightNb: 2902,DptDate: "0109",DptTime: "09:30",ArrTime: "11:05",DptAirport: VIE,ArrAirport: BRU}
- {OpCarrier: SN,MktCarrier: SN,FlightNb: 243,DptDate: "0109",DptTime: "12:15",ArrTime: "17:00",DptAirport: BRU,ArrAirport: FNA}
- {OpCarrier: OS,MktCarrier: LH,FlightNb: 6325,DptDate: "0109",DptTime: "06:30",ArrTime: "07:35",DptAirport: VIE,ArrAirport: MUC}
Prices:
- {TotalPrice: 1574.14,BaseAmount: 1368.00,TotalTaxe: 206.14,TotalSurcharge: 0.00,TotalFee: 0.00}
- {TotalPrice: 1633.57,BaseAmount: 1368.00,TotalTaxe: 265.57,TotalSurcharge: 0.00,TotalFee: 0.00}
- {TotalPrice: 1636.57,BaseAmount: 1368.00,TotalTaxe: 268.57,TotalSurcharge: 0.00,TotalFee: 0.00}
LFSDetails: |
PriceInfos:
- {FaresRef: [1,2],Price: {Total: 1574.14},Amount: {Total: 1368.00},Taxes: {Total: 206.14},Surcharges: {Total: 0.00},Fees: {Total: 0.00}}
- {FaresRef: [3,4,2],Price: {Total: 1633.57},Amount: {Total: 1368.00},Taxes: {Total: 265.57},Surcharges: {Total: 0.00},Fees: {Total: 0.00}}
- {FaresRef: [3,4,2],Price: {Total: 1636.57},Amount: {Total: 1368.00},Taxes: {Total: 268.57},Surcharges: {Total: 0.00},Fees: {Total: 0.00}}
ListCabinRequested: []
FareInfo:
- {RBD: M,FareBasis: BFFOWAT,PTC: ADT,BreakPointId: N,Availability: 9,Cabin: W,FareType: OB}
- {RBD: B,FareBasis: BFFOWAT,PTC: ADT,BreakPointId: Y,Availability: 9,Cabin: W,FareType: OB}
- {RBD: B,FareBasis: BFFOWAT,PTC: ADT,BreakPointId: N,Availability: 9,Cabin: M,FareType: OB}
Currency: EUR
"""
for data in yaml.load_all(yaml_str):
lfs_data = data['LFSDetails']
nested_data = yaml.load(lfs_data)
print(type(nested_data))
print(nested_data['FareInfo'][1]['BreakPointId'])
</code></pre>
<p>它将您作为输出:</p>
<pre><code><type 'dict'>
Y
</code></pre>
<hr/>
<p>¹<sub>这是使用<a href="https://pypi.python.org/pypi/ruamel.yaml" rel="nofollow">ruamel.yaml</a>完成的,我是其中的作者。它是PyYAML的增强版,使用它的结果应该是相似的。</sub></p>