"Python" xpath-1

1, coverage package implementation code Coverage (1) pip install coverage (2) Coverage run xx.py (test script file) (3) Coverage report-m print out Coverage Information Report (4) coverage in the console HTML generates a Htmlcov file in the same directoryfolder, open index.html in folders to view code coverage in a graphical interface 2, Xpath Understanding(1) XPath is a language that looks for information in an XML document. XPath is used to navigate through elements and attributes in an XML document. 3, XPath basic Syntax http://www.w3school.com.cn/example/xmle/books.xml (1) slash/select from the root node, representing the absolute path (2) double slash//relative path, as long as the condition of the display exercise:

Select all the parent elements are the BBB element syntax for DDD://DDD/BBB

<AAA>  
<BBB/>  
<CCC/>  
<BBB/>  
<DDD>  
<BBB/>  
</DDD>  
<CCC>  
<DDD>  
<BBB/>  
<BBB/>  
</DDD>  
</CCC>  
</AAA>

Selects all BBB element syntax for the AAA's CCC:/aaa/ccc//bbb

<AAA>  
<BBB/>  
<CCC/>  
<BBB/>  
<DDD>  
<BBB/>  
</DDD>  
<CCC>  
<DDD>  
<BBB/>  
<BBB/>  
</DDD>  
</CCC>  
</AAA>

(3) point "." Select the current node

(2) point "..." Select the parent node of the current node

(4) [@] Property Select all Category property choose the book element with the Category property to select All Properties category= "Web" or "category=" by selecting the book element with the category= "cooking" property Paperback "element selects a book element with any attribute select an element relative to an attribute that does not have a property lookup (5) find the first element

Select the first BBB element syntax under AAA:/aaa/bbb[1]

< AAA >  
<BBB/>
<BBB/>
<BBB/>
<BBB/>
</AAA>

(6) Select the last BBB element under AAA syntax:/aaa/bbb[last ()]

< AAA >  
<BBB/>
<BBB/>
<BBB/>
<BBB/>
</AAA>

(7) Select the second-lowest BBB element under AAA syntax:/aaa/bbb[last ()-1]

< AAA >  
<BBB/>
<BBB/>
<BBB/>
<BBB/>
</AAA>

(8) Select the first two BBB element syntax under AAA:/aaa/bbb[position () <3]

< AAA >  
<BBB/>
<BBB/>
<BBB/>
<BBB/>
</AAA>

(9) Obtain the CCC element syntax under the BBB under the AAA with the S attribute:/aaa/bbb/ccc[@s]

<AAA> 
<BBB> 
<CCCs = "1"/> 
<CCCs = "2"/> 
<CCCs = "3"/> 
<CCCs = "4"/> 
<CCCs = "5"/> 
<CCC r = "a"/> 
</BBB> 
<CCC> 
<BBB r = "a"/> 
<BBB r = "B"/> 
<BBB r = "C"/> 
</CCC> 
<BBB/> 
<BBB/> 
</AAA>

"Python" xpath-1