我用xmltodict解析了一个XML文件，我发现了<coordinates>标记的路径，我希望从中提取lat＆amp;要添加到数据框的长值。这是一个小样本：
<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2">
<Document>
<Folder>
<name>One Line Diagram</name>
<open>0</open>
<Folder>
<name>SectionOne</name>
<open>0</open>
<Folder>
<name>Node</name>
<open>0</open>
<Placemark>
<name>5680420</name>
<styleUrl>#Style_0</styleUrl>
<description />
<MultiGeometry type="MultiGeometry" Type="MultiGeometry">
<Polygon>
<outerBoundaryIs>
<LinearRing>
<coordinates>-83.6514766,67.0234192 -83.6515403,67.0233918 -83.6515309,67.0233134 -83.6514609,67.0232885 -83.5778406,67.0246267 -83.5777768,67.0246541 -83.5777861,67.0247325 -83.5778560,67.0247574 -83.6514766,67.0234192</coordinates>
</LinearRing>
</outerBoundaryIs>
</Polygon>
</MultiGeometry>
</Placemark>
<Placemark>
<name>25934531</name>
<styleUrl>#Style_0</styleUrl>
ML60
<description />
<MultiGeometry type="MultiGeometry" Type="MultiGeometry">
<Polygon>
<outerBoundaryIs>
<LinearRing>
<coordinates>-83.6512679,67.0216805 -83.6513317,67.0216531 -83.6513222,67.0215747 -83.6512522,67.0215498 -83.5967049,67.0225434 -83.5966412,67.0225708 -83.5966505,67.0226492 -83.5967204,67.0226741 -83.6512679,67.0216805</coordinates>
</LinearRing>
</outerBoundaryIs>
</Polygon>
</MultiGeometry>
</Placemark>
</Folder>
</Folder>
</Folder>
</Document>
</kml>
路径在下面。
> doc['kml']['Document']['Folder']['Folder']['Folder'][0]['Placemark'][0]['MultiGeometry']['Polygon']['outerBoundaryIs']['LinearRing']['coordinates']
这是一个非常长的xml文档，包含4个Folder标记，但我只需要第一个['Folder'][0]中的值。我不知道该怎么做是遍历所有['Placemark'][n]，直到提取出所有坐标。
我已经尝试了几件事，最后一件是下面的，这是尝试开始向下工作到正确的标签。但无济于事。
root_elements = doc['Document'] if type(doc['Document']) == OrderedDict else [doc['Document']]
for element in root_elements:
print(element['Placemark'])
回溯：
Traceback (most recent call last)
<ipython-input-69-db580dc8b6e2> in <module>()
----> 1 root_elements = doc['Document'] if type(doc['Document']) == OrderedDict else [doc['Document']]
2 for element in root_elements:
3 print(element['Placemark'])
KeyError: 'Document'
感谢任何帮助。
答案 0 :(得分：0)
您的xml缺少2个文件夹的结束标记（第4个到最后一个和第3个到最后一行。只需将它们复制并粘贴到您的XML文件中）。
使用此工具缩进XML https://www.freeformatter.com/xml-formatter.html#ad-output
in_array()使用xmltodict从包含XML的coordinates.xml文件中提取坐标（包含2个缺少的文件夹结束标记）
$search = 'b';
$result = 'nothing';
foreach ($arrayglobal as $array) {
if (in_array($search, $array)) {
$result = 'found';
break;
}
}
print $result;
输出打印“坐标”列表
<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2">
<Document>
<Folder>
<name>One Line Diagram</name>
<open>0</open>
<Folder>
<name>SectionOne</name>
<open>0</open>
<Folder>
<name>Node</name>
<open>0</open>
<Placemark>
<name>5680420</name>
<styleUrl>#Style_0</styleUrl>
<description />
<MultiGeometry type="MultiGeometry" Type="MultiGeometry">
<Polygon>
<outerBoundaryIs>
<LinearRing>
<coordinates>-83.6514766,67.0234192 -83.6515403,67.0233918 -83.6515309,67.0233134 -83.6514609,67.0232885 -83.5778406,67.0246267 -83.5777768,67.0246541 -83.5777861,67.0247325 -83.5778560,67.0247574 -83.6514766,67.0234192</coordinates>
</LinearRing>
</outerBoundaryIs>
</Polygon>
</MultiGeometry>
</Placemark>
<Placemark>
<name>25934531</name>
<styleUrl>#Style_0</styleUrl>
ML60
<description />
<MultiGeometry type="MultiGeometry" Type="MultiGeometry">
<Polygon>
<outerBoundaryIs>
<LinearRing>
<coordinates>-83.6512679,67.0216805 -83.6513317,67.0216531 -83.6513222,67.0215747 -83.6512522,67.0215498 -83.5967049,67.0225434 -83.5966412,67.0225708 -83.5966505,67.0226492 -83.5967204,67.0226741 -83.6512679,67.0216805</coordinates>
</LinearRing>
</outerBoundaryIs>
</Polygon>
</MultiGeometry>
</Placemark>
</Folder>
</Folder>
</Folder>
</Document>
</kml>
coordinates [0]给出第一个地标标记
的坐标列表import xmltodict
with open('coordinates.xml') as coords:
doc = xmltodict.parse(coords.read())
coordinates = []
#Loop and get each placemark tag in document
for placemark in doc['kml']['Document']['Folder']['Folder']['Folder']['Placemark']:
#Get coordinates string from current placemark
coordinateString=placemark['MultiGeometry']['Polygon']['outerBoundaryIs']['LinearRing']['coordinates']
#split coordinates string into lists of coordinates. Split co-ord pairs by space (" "). Split x & y of each co-ord by comma (",")
coordinateList=[x.split(",") for x in coordinateString.split(" ")]
coordinates.append(coordinateList)
print(coordinates)
coordinates [0] [0]给出第一个地标标记
的第一个坐标对[[[u'-83.6514766', u'67.0234192'], [u'-83.6515403', u'67.0233918'], [u'-83.6515309', u'67.0233134'], [u'-83.6514609', u'67.0232885'], [u'-83.5778406', u'67.0246267'], [u'-83.5777768', u'67.0246541'], [u'-83.5777861', u'67.0247325'], [u'-83.5778560', u'67.0247574'], [u'-83.6514766', u'67.0234192']], [[u'-83.6512679', u'67.0216805'], [u'-83.6513317', u'67.0216531'], [u'-83.6513222', u'67.0215747'], [u'-83.6512522', u'67.0215498'], [u'-83.5967049', u'67.0225434'], [u'-83.5966412', u'67.0225708'], [u'-83.5966505', u'67.0226492'], [u'-83.5967204', u'67.0226741'], [u'-83.6512679', u'67.0216805']]]
coordinates [0] [0]给出第一个地标标记
的第一个坐标对的x值[[u'-83.6514766', u'67.0234192'], [u'-83.6515403', u'67.0233918'], [u'-83.6515309', u'67.0233134'], [u'-83.6514609', u'67.0232885'], [u'-83.5778406', u'67.0246267'], [u'-83.5777768', u'67.0246541'], [u'-83.5777861', u'67.0247325'], [u'-83.5778560', u'67.0247574'], [u'-83.6514766', u'67.0234192']], [[u'-83.6512679', u'67.0216805']