Hướng dẫn edit xml file python
XML stands for eXtensible Markup Language. It was designed to store and transport small to medium amounts of data and is widely used for sharing structured information. Python enables you to parse and modify XML documents. In order to parse XML document, you need to have the entire XML document in memory. In this tutorial, we will see how we can use XML minidom class in Python to load and parse XML files. We have created a sample XML file that we are going to parse. Step 1) Create Sample XML file Inside the file, we can see the first name, last name, home, and the area of expertise (SQL, Python, Testing and Business) Step 2) Use the parse function to load and parse the XML file Once we have parsed the document, we will print out the “node name” of the root of the document and the “firstchild tagname”. Tagname and nodename are the standard properties of the XML file.
Note: Nodename and child tagname are the standard names or properties of an XML dom. Step 3) Call the list of XML tags from the XML document and printed out Next, We can also call the list of XML tags from the XML document and printed out. Here we printed out the set of skills like SQL, Python, Testing and Business.
We can create a new attribute by using the “createElement” function and then append this new attribute or tag to the existing XML tags. We added a new tag “BigData” in our XML file.
XML Parser ExamplePython 2 Example import xml.dom.minidom def main(): # use the parse() function to load and parse an XML file doc = xml.dom.minidom.parse("Myxml.xml"); # print out the document node and the name of the first child tag print doc.nodeName print doc.firstChild.tagName # get a list of XML tags from the document and print each one expertise = doc.getElementsByTagName("expertise") print "%d expertise:" % expertise.length for skill in expertise: print skill.getAttribute("name") #Write a new XML tag and add it into the document newexpertise = doc.createElement("expertise") newexpertise.setAttribute("name", "BigData") doc.firstChild.appendChild(newexpertise) print " " expertise = doc.getElementsByTagName("expertise") print "%d expertise:" % expertise.length for skill in expertise: print skill.getAttribute("name") if name == "__main__": main(); Python 3 Example import xml.dom.minidom def main(): # use the parse() function to load and parse an XML file doc = xml.dom.minidom.parse("Myxml.xml"); # print out the document node and the name of the first child tag print (doc.nodeName) print (doc.firstChild.tagName) # get a list of XML tags from the document and print each one expertise = doc.getElementsByTagName("expertise") print ("%d expertise:" % expertise.length) for skill in expertise: print (skill.getAttribute("name")) # Write a new XML tag and add it into the document newexpertise = doc.createElement("expertise") newexpertise.setAttribute("name", "BigData") doc.firstChild.appendChild(newexpertise) print (" ") expertise = doc.getElementsByTagName("expertise") print ("%d expertise:" % expertise.length) for skill in expertise: print (skill.getAttribute("name")) if __name__ == "__main__": main(); How to Parse XML using ElementTreeElementTree is an API for manipulating XML. ElementTree is the easy way to process XML files. We are using the following XML document as the sample data:
Reading XML using ElementTree: we must first import the xml.etree.ElementTree module. import xml.etree.ElementTree as ET Now let’s fetch the root element: root = tree.getroot() Following is the complete code for reading above xml data import xml.etree.ElementTree as ET tree = ET.parse('items.xml') root = tree.getroot() # all items data print('Expertise Data:') for elem in root: for subelem in elem: print(subelem.text) output: Expertise Data: SQL Python Summary:Python enables you to parse the entire XML document at one go and not just one line at a time. In order to parse XML document you need to have the entire document in memory.
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