在python中使用lxml和XPath解析xml文件以提取元素值

Question

我有这个xml文件，我想提取与某些特定元素相关联的值。更具体地说，我想要的是当元素值为Marks时，检查下一个元素值是否为Marks of Student（它们在下面所示的示例xml中朝向的末尾）。如果提取/打印这两个标签和下三个标签（最小值、最大值和平均值）：

<?xml version="1.0"?>
<?mso-application progid="Excel.Sheet"?>
<Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet"
 xmlns:o="urn:schemas-microsoft-com:office:office"
 xmlns:x="urn:schemas-microsoft-com:office:excel"
 xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet"
 xmlns:html="http://www.w3.org/TR/REC-html40">
 <DocumentProperties xmlns="urn:schemas-microsoft-com:office:office">
  <Version>16.00</Version>
 </DocumentProperties>
 <OfficeDocumentSettings xmlns="urn:schemas-microsoft-com:office:office">
  <AllowPNG/>
 </OfficeDocumentSettings>
 <ExcelWorkbook xmlns="urn:schemas-microsoft-com:office:excel">
  <WindowHeight>9888</WindowHeight>
  <WindowWidth>15360</WindowWidth>
  <WindowTopX>0</WindowTopX>
  <WindowTopY>0</WindowTopY>
  <ProtectStructure>False</ProtectStructure>
  <ProtectWindows>False</ProtectWindows>
 </ExcelWorkbook>
 <Styles>
  <Style ss:ID="Default" ss:Name="Normal">
   <Alignment ss:Vertical="Bottom"/>
   <Borders/>
   <Font ss:FontName="Calibri" x:Family="Swiss" ss:Size="11" ss:Color="#000000"/>
   <Interior/>
   <NumberFormat/>
   <Protection/>
  </Style>
  <Style ss:ID="m5479808">
   <Alignment ss:Horizontal="Center" ss:Vertical="Bottom" ss:WrapText="1"/>
   <Borders>
    <Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
   </Borders>
   <Font ss:FontName="Arial, Helvetica" ss:Size="9" ss:Color="#000000" ss:Bold="1"/>
   <Interior ss:Color="#FFFFFF" ss:Pattern="Solid"/>
   <NumberFormat/>
   <Protection/>
  </Style>
  <Style ss:ID="m5479828">
   <Alignment ss:Horizontal="Center" ss:Vertical="Bottom" ss:WrapText="1"/>
   <Borders>
    <Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
   </Borders>
   <Font ss:FontName="Arial, Helvetica" ss:Size="9" ss:Color="#000000" ss:Bold="1"/>
   <Interior ss:Color="#FFFFFF" ss:Pattern="Solid"/>
   <NumberFormat/>
   <Protection/>
  </Style>
  <Style ss:ID="s62">
   <Alignment ss:Vertical="Bottom"/>
   <Borders/>
   <Font ss:FontName="Calibri" x:Family="Swiss" ss:Size="11" ss:Color="#000000"/>
   <Interior ss:Color="#FFFFFF" ss:Pattern="Solid"/>
   <NumberFormat/>
   <Protection/>
  </Style>
  <Style ss:ID="s64">
   <Alignment ss:Horizontal="Center" ss:Vertical="Bottom" ss:WrapText="1"/>
   <Borders/>
   <Font ss:FontName="Arial, Helvetica" ss:Size="12" ss:Color="#000000" ss:Bold="1"/>
   <Interior ss:Color="#FFFFFF" ss:Pattern="Solid"/>
   <NumberFormat/>
   <Protection/>
  </Style>
  <Style ss:ID="s65">
   <Alignment ss:Horizontal="Center" ss:Vertical="Bottom" ss:WrapText="1"/>
   <Borders>
    <Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
   </Borders>
   <Font ss:FontName="Arial, Helvetica" ss:Size="9" ss:Color="#000000" ss:Bold="1"/>
   <Interior ss:Color="#FFFFFF" ss:Pattern="Solid"/>
   <NumberFormat/>
   <Protection/>
  </Style>
  <Style ss:ID="s72">
   <Alignment ss:Horizontal="Right" ss:Vertical="Bottom" ss:WrapText="1"/>
   <Borders>
    <Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
   </Borders>
   <Font ss:FontName="Arial, Helvetica" ss:Size="9" ss:Color="#000000"/>
   <Interior/>
   <NumberFormat/>
   <Protection/>
  </Style>
  <Style ss:ID="s73">
   <Alignment ss:Horizontal="Left" ss:Vertical="Bottom" ss:WrapText="1"/>
   <Borders>
    <Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
   </Borders>
   <Font ss:FontName="Arial, Helvetica" ss:Size="9" ss:Color="#000000"/>
   <Interior/>
   <NumberFormat/>
   <Protection/>
  </Style>
  <Style ss:ID="s74">
   <Alignment ss:Horizontal="Center" ss:Vertical="Bottom" ss:WrapText="1"/>
   <Borders>
    <Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
   </Borders>
   <Font ss:FontName="Arial, Helvetica" ss:Size="9" ss:Color="#000000"/>
   <Interior/>
   <NumberFormat/>
   <Protection/>
  </Style>
  <Style ss:ID="s76">
   <Alignment ss:Horizontal="Center" ss:Vertical="Bottom" ss:WrapText="1"/>
   <Borders/>
   <Font ss:FontName="Arial, Helvetica" ss:Size="9" ss:Color="#000000"/>
   <Interior ss:Color="#FFFFFF" ss:Pattern="Solid"/>
   <NumberFormat/>
   <Protection/>
  </Style>
  <Style ss:ID="s78">
   <Alignment ss:Horizontal="Center" ss:Vertical="Bottom" ss:WrapText="1"/>
   <Borders/>
   <Font ss:FontName="Arial, Helvetica" ss:Size="9" ss:Color="#000000" ss:Bold="1"/>
   <Interior/>
   <NumberFormat/>
   <Protection/>
  </Style>
  <Style ss:ID="s79">
   <Alignment ss:Horizontal="Center" ss:Vertical="Bottom" ss:WrapText="1"/>
   <Borders>
    <Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
   </Borders>
   <Font ss:FontName="Arial, Helvetica" ss:Size="9" ss:Color="#000000" ss:Bold="1"/>
   <Interior ss:Color="#FFFFFF" ss:Pattern="Solid"/>
   <NumberFormat ss:Format="###0"/>
   <Protection/>
  </Style>
  <Style ss:ID="s80">
   <Alignment ss:Horizontal="Center" ss:Vertical="Bottom" ss:WrapText="1"/>
   <Borders>
    <Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
   </Borders>
   <Font ss:FontName="Arial, Helvetica" ss:Size="9" ss:Color="#000000" ss:Bold="1"/>
   <Interior ss:Color="#FFFFFF" ss:Pattern="Solid"/>
   <NumberFormat ss:Format="###0.00"/>
   <Protection/>
  </Style>
  <Style ss:ID="s81">
   <Alignment ss:Horizontal="Center" ss:Vertical="Bottom" ss:WrapText="1"/>
   <Borders>
    <Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
   </Borders>
   <Font ss:FontName="Arial, Helvetica" ss:Size="9" ss:Color="#000000" ss:Bold="1"/>
   <Interior ss:Color="#FFFFFF" ss:Pattern="Solid"/>
   <NumberFormat ss:Format="#,##0"/>
   <Protection/>
  </Style>
  <Style ss:ID="s82">
   <Alignment ss:Horizontal="Right" ss:Vertical="Bottom" ss:WrapText="1"/>
   <Borders>
    <Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
   </Borders>
   <Font ss:FontName="Arial, Helvetica" ss:Size="9" ss:Color="#000000"/>
   <Interior/>
   <NumberFormat ss:Format="###0"/>
   <Protection/>
  </Style>
  <Style ss:ID="s83">
   <Alignment ss:Horizontal="Right" ss:Vertical="Bottom" ss:WrapText="1"/>
   <Borders>
    <Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
   </Borders>
   <Font ss:FontName="Arial, Helvetica" ss:Size="9" ss:Color="#000000"/>
   <Interior/>
   <NumberFormat ss:Format="###0.00"/>
   <Protection/>
  </Style>
  <Style ss:ID="s84">
   <Alignment ss:Horizontal="Right" ss:Vertical="Bottom" ss:WrapText="1"/>
   <Borders>
    <Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
   </Borders>
   <Font ss:FontName="Arial, Helvetica" ss:Size="9" ss:Color="#000000"/>
   <Interior/>
   <NumberFormat ss:Format="#,##0"/>
   <Protection/>
  </Style>
  <Style ss:ID="s85">
   <Alignment ss:Horizontal="Center" ss:Vertical="Bottom" ss:WrapText="1"/>
   <Borders>
    <Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
   </Borders>
   <Font ss:FontName="Arial, Helvetica" ss:Size="9" ss:Color="#000000" ss:Bold="1"/>
   <Interior ss:Color="#FFFFFF" ss:Pattern="Solid"/>
   <NumberFormat ss:Format="##,##0"/>
   <Protection/>
  </Style>
  <Style ss:ID="s86">
   <Alignment ss:Horizontal="Center" ss:Vertical="Bottom" ss:WrapText="1"/>
   <Borders>
    <Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
   </Borders>
   <Font ss:FontName="Arial, Helvetica" ss:Size="9" ss:Color="#000000" ss:Bold="1"/>
   <Interior ss:Color="#FFFFFF" ss:Pattern="Solid"/>
   <NumberFormat ss:Format="####0.00"/>
   <Protection/>
  </Style>
  <Style ss:ID="s87">
   <Alignment ss:Horizontal="Right" ss:Vertical="Bottom" ss:WrapText="1"/>
   <Borders>
    <Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
   </Borders>
   <Font ss:FontName="Arial, Helvetica" ss:Size="9" ss:Color="#000000"/>
   <Interior/>
   <NumberFormat ss:Format="##,##0"/>
   <Protection/>
  </Style>
  <Style ss:ID="s88">
   <Alignment ss:Horizontal="Right" ss:Vertical="Bottom" ss:WrapText="1"/>
   <Borders>
    <Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
   </Borders>
   <Font ss:FontName="Arial, Helvetica" ss:Size="9" ss:Color="#000000"/>
   <Interior/>
   <NumberFormat ss:Format="####0.00"/>
   <Protection/>
  </Style>
  <Style ss:ID="s89">
   <Alignment ss:Horizontal="Center" ss:Vertical="Bottom" ss:WrapText="1"/>
   <Borders>
    <Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
   </Borders>
   <Font ss:FontName="Arial, Helvetica" ss:Size="9" ss:Color="#000000" ss:Bold="1"/>
   <Interior ss:Color="#FFFFFF" ss:Pattern="Solid"/>
   <NumberFormat ss:Format="@"/>
   <Protection/>
  </Style>
  <Style ss:ID="s90">
   <Alignment ss:Horizontal="Left" ss:Vertical="Bottom" ss:WrapText="1"/>
   <Borders>
    <Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
   </Borders>
   <Font ss:FontName="Arial, Helvetica" ss:Size="9" ss:Color="#000000"/>
   <Interior/>
   <NumberFormat ss:Format="@"/>
   <Protection/>
  </Style>
  <Style ss:ID="s91">
   <Alignment ss:Horizontal="Center" ss:Vertical="Bottom" ss:WrapText="1"/>
   <Borders>
    <Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
   </Borders>
   <Font ss:FontName="Arial, Helvetica" ss:Size="9" ss:Color="#000000"/>
   <Interior/>
   <NumberFormat ss:Format="@"/>
   <Protection/>
  </Style>
  <Style ss:ID="s92">
   <Alignment ss:Horizontal="Left" ss:Vertical="Bottom"/>
   <Borders/>
   <Font ss:FontName="Arial, Helvetica" ss:Size="12" ss:Color="#000000" ss:Bold="1"/>
   <Interior ss:Color="#FFFFFF" ss:Pattern="Solid"/>
   <NumberFormat/>
   <Protection/>
  </Style>
  <Style ss:ID="s98">
   <Alignment ss:Horizontal="Center" ss:Vertical="Bottom"/>
   <Borders/>
   <Font ss:FontName="Arial, Helvetica" ss:Size="12" ss:Color="#000000" ss:Bold="1"/>
   <Interior ss:Color="#FFFFFF" ss:Pattern="Solid"/>
   <NumberFormat/>
   <Protection/>
  </Style>
  <Style ss:ID="s99">
   <Alignment ss:Horizontal="Right" ss:Vertical="Bottom"/>
   <Borders>
    <Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
   </Borders>
   <Font ss:FontName="Arial, Helvetica" ss:Size="9" ss:Color="#000000" ss:Bold="1"/>
   <Interior ss:Color="#FFFFFF" ss:Pattern="Solid"/>
   <NumberFormat/>
   <Protection/>
  </Style>
  <Style ss:ID="s100">
   <Alignment ss:Horizontal="Left" ss:Vertical="Bottom"/>
   <Borders>
    <Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
   </Borders>
   <Font ss:FontName="Arial, Helvetica" ss:Size="9" ss:Color="#000000" ss:Bold="1"/>
   <Interior ss:Color="#FFFFFF" ss:Pattern="Solid"/>
   <NumberFormat ss:Format="@"/>
   <Protection/>
  </Style>
  <Style ss:ID="s101">
   <Alignment ss:Horizontal="Left" ss:Vertical="Bottom"/>
   <Borders>
    <Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
   </Borders>
   <Font ss:FontName="Arial, Helvetica" ss:Size="9" ss:Color="#000000" ss:Bold="1"/>
   <Interior ss:Color="#FFFFFF" ss:Pattern="Solid"/>
   <NumberFormat/>
   <Protection/>
  </Style>
  <Style ss:ID="s102">
   <Alignment ss:Horizontal="Right" ss:Vertical="Bottom"/>
   <Borders>
    <Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
   </Borders>
   <Font ss:FontName="Arial, Helvetica" ss:Size="9" ss:Color="#000000" ss:Bold="1"/>
   <Interior ss:Color="#FFFFFF" ss:Pattern="Solid"/>
   <NumberFormat ss:Format="@"/>
   <Protection/>
  </Style>
  <Style ss:ID="s103">
   <Alignment ss:Horizontal="Right" ss:Vertical="Bottom"/>
   <Borders>
    <Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
   </Borders>
   <Font ss:FontName="Arial, Helvetica" ss:Size="9" ss:Color="#000000"/>
   <Interior/>
   <NumberFormat/>
   <Protection/>
  </Style>
  <Style ss:ID="s104">
   <Alignment ss:Horizontal="Left" ss:Vertical="Bottom"/>
   <Borders>
    <Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
   </Borders>
   <Font ss:FontName="Arial, Helvetica" ss:Size="9" ss:Color="#000000"/>
   <Interior/>
   <NumberFormat ss:Format="@"/>
   <Protection/>
  </Style>
  <Style ss:ID="s105">
   <Alignment ss:Horizontal="Left" ss:Vertical="Bottom"/>
   <Borders>
    <Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
   </Borders>
   <Font ss:FontName="Arial, Helvetica" ss:Size="9" ss:Color="#000000"/>
   <Interior/>
   <NumberFormat/>
   <Protection/>
  </Style>
  <Style ss:ID="s106">
   <Alignment ss:Horizontal="Right" ss:Vertical="Bottom"/>
   <Borders>
    <Border ss:Position="Bottom" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Left" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Right" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
    <Border ss:Position="Top" ss:LineStyle="Continuous" ss:Weight="1"
     ss:Color="#000000"/>
   </Borders>
   <Font ss:FontName="Arial, Helvetica" ss:Size="9" ss:Color="#000000"/>
   <Interior/>
   <NumberFormat ss:Format="@"/>
   <Protection/>
  </Style>
  <Style ss:ID="s108">
   <Alignment ss:Horizontal="Left" ss:Vertical="Bottom"/>
   <Borders/>
   <Font ss:FontName="Arial, Helvetica" ss:Size="9" ss:Color="#000000"/>
   <Interior ss:Color="#FFFFFF" ss:Pattern="Solid"/>
   <NumberFormat/>
   <Protection/>
  </Style>
  <Style ss:ID="s109">
   <Alignment ss:Horizontal="Left" ss:Vertical="Bottom"/>
   <Borders/>
   <Font ss:FontName="Calibri" x:Family="Swiss" ss:Size="11" ss:Color="#000000"/>
   <Interior ss:Color="#FFFFFF" ss:Pattern="Solid"/>
   <NumberFormat/>
   <Protection/>
  </Style>
 </Styles>
 <Worksheet ss:Name="dataset Contents">
  <Table ss:ExpandedColumnCount="6" ss:ExpandedRowCount="86" x:FullColumns="1"
   x:FullRows="1" ss:StyleID="s62" ss:DefaultRowHeight="14.4">
   <Column ss:StyleID="s62" ss:Width="33.6"/>
   <Column ss:StyleID="s62" ss:Width="108"/>
   <Column ss:StyleID="s62" ss:Width="67.8" ss:Span="1"/>
   <Column ss:Index="5" ss:StyleID="s62" ss:Width="94.8"/>
   <Column ss:StyleID="s62" ss:Width="229.8"/>
   <Row ss:AutoFitHeight="0" ss:Height="31.95">
    <Cell ss:MergeAcross="5" ss:StyleID="s64"><Data ss:Type="String">Students Score Summary</Data></Cell>
   </Row>

  <!--...bunch of <Row><Cell><Data> tags which I don't want to extract..-->

  <Cell ss:StyleID="s65"><Data ss:Type="String">Variable Name</Data></Cell>
    <Cell ss:StyleID="s65"><Data ss:Type="String">Variable Label</Data></Cell>
    <Cell ss:StyleID="s79"><Data ss:Type="String">Minimum&#10;Value</Data></Cell>
    <Cell ss:StyleID="s79"><Data ss:Type="String">Maximum&#10;Value</Data></Cell>
    <Cell ss:StyleID="s80"><Data ss:Type="String">Mean&#10;Value</Data></Cell>

   <Row ss:AutoFitHeight="0" ss:Height="15">
    <Cell ss:StyleID="s73"><Data ss:Type="String">Marks</Data></Cell>
    <Cell ss:StyleID="s73"><Data ss:Type="String">Marks of Student</Data></Cell>
    <Cell ss:StyleID="s82"><Data ss:Type="Number">0</Data></Cell>
    <Cell ss:StyleID="s82"><Data ss:Type="Number">96</Data></Cell>
    <Cell ss:StyleID="s83"><Data ss:Type="Number">65.71</Data></Cell>
   </Row>
   <Row ss:AutoFitHeight="0" ss:Height="15">
    <Cell ss:StyleID="s73"><Data ss:Type="String">Name</Data></Cell>
    <Cell ss:StyleID="s73"><Data ss:Type="String">Name of Students</Data></Cell>
    <Cell ss:StyleID="s82"><Data ss:Type="Number">n/a</Data></Cell>
    <Cell ss:StyleID="s82"><Data ss:Type="Number">n/a</Data></Cell>
    <Cell ss:StyleID="s83"><Data ss:Type="Number">n/a</Data></Cell>
   </Row>

   <!--...bunch of <Row><Cell><Data> tags which I don't want to extract..-->
    .
    .
    .
</Workbook>

目前我有这段代码，我使用ElementTree来解析xml文件，但是它没有产生任何输出（它不打印任何内容）。在

^{pr2}$

我试图寻找lxml和{}，但不知道如何去做。如何修改当前代码以使用lxml和XPath解析xml文件并获得我想要的输出？在

Answer 1

下面是一种使用ElementTree提取所需信息的方法：

from xml.etree import ElementTree as ET

NSMAP = {"ss": "urn:schemas-microsoft-com:office:spreadsheet"}

tree = ET.parse("xmlFile1.xml")

# Find all Row elements
rows = tree.findall(".//ss:Row", NSMAP)

# For each Row, get all Data 'grandchildren'
for row in rows:
    data = row.findall("ss:Cell/ss:Data", NSMAP)

    if data and len(data) == 5:     
        # If first two Data elements are what we want, print out all Data element values
        if data[0].text == "Marks" and data[1].text == "Marks of Student":
            for d in data:
                print (d.text)

输出：

^{pr2}$

默认名称空间是urn:schemas-microsoft-com:office:spreadsheet，您感兴趣的元素就在这个名称空间中。这就是为什么我们需要使用NSMAP字典。见https://docs.python.org/3/library/xml.etree.elementtree.html#parsing-xml-with-namespaces。在