如何使用Python解析文件夹中的多个XML文件？

Alright, let's break down how to parse all those XML files in your folder using Python. I'll cover two reliable approaches, using your sample XML snippet as a reference:

方法一：用Python内置的xml.etree.ElementTree #

This is the go-to option if you don't want to install any extra libraries—it's built right into Python, perfect for handling standard XML files.

Here's how it works: #

1. Loop through your target folder and pick out all files with the .xml extension
2. Read and parse each XML file one by one
3. Extract the specific fields you need (like case name, AustLII link, citation details)

Code example: #

import os
import xml.etree.ElementTree as ET

# Replace this with the actual path to your XML folder
xml_folder = "./your_xml_directory"

# Iterate over all XML files in the folder
for filename in os.listdir(xml_folder):
    if filename.endswith(".xml"):
        file_path = os.path.join(xml_folder, filename)
        try:
            # Parse the XML file
            tree = ET.parse(file_path)
            root = tree.getroot()

            # Pull out the case name
            case_name = root.find("name").text
            print(f"Case Name: {case_name}")

            # Grab the AustLII link
            austlii_link = root.find("AustLII").text
            print(f"AustLII Link: {austlii_link}")

            # Extract citation details
            citations_section = root.find("citations")
            if citations_section is not None:
                for citation in citations_section.findall("citation"):
                    # Quick note: Your sample XML has a syntax error here—`<citation "id=c0">` should be `<citation id="c0">`
                    cite_class = citation.find("class").text
                    cited_case = citation.find("tocase").text
                    print(f"Citation Type: {cite_class}, Cited Case: {cited_case}")

            print("---")
        except ET.ParseError as e:
            print(f"Failed to parse {filename}: {e}")
        except Exception as e:
            print(f"Error processing {filename}: {e}")

方法二：用lxml库（更强大的XML处理工具） #

If you need to handle more complex XML structures or want to use XPath queries for easier extraction, lxml is the way to go. First, you'll need to install it:

pip install lxml

Code example: #

import os
from lxml import etree

xml_folder = "./your_xml_directory"

for filename in os.listdir(xml_folder):
    if filename.endswith(".xml"):
        file_path = os.path.join(xml_folder, filename)
        try:
            # Parse the XML file
            tree = etree.parse(file_path)

            # Use XPath to get the case name
            case_name = tree.xpath("//name/text()")[0]
            print(f"Case Name: {case_name}")

            # Extract the AustLII link with XPath
            austlii_link = tree.xpath("//AustLII/text()")[0]
            print(f"AustLII Link: {austlii_link}")

            # Grab all citation entries
            citations = tree.xpath("//citations/citation")
            for cite in citations:
                cite_class = cite.xpath("./class/text()")[0]
                cited_case = cite.xpath("./tocase/text()")[0]
                print(f"Citation Type: {cite_class}, Cited Case: {cited_case}")

            print("---")
        except etree.XMLSyntaxError as e:
            print(f"XML syntax error in {filename}: {e}")
        except IndexError:
            print(f"Missing expected fields in {filename}")
        except Exception as e:
            print(f"Error processing {filename}: {e}")

A couple of important notes: #

• Fix XML syntax first: Your sample XML has an invalid tag <citation "id=c0">—this should be <citation id="c0"> (attribute values need to be wrapped in quotes, and the attribute name comes first). Invalid XML will break any parser.
• Handle encoding if needed: If your XML files use a non-UTF-8 encoding (like GB2312), you can specify it when parsing. For ElementTree, add parser=ET.XMLParser(encoding='your_encoding') to the parse() call; for lxml, use parser=etree.XMLParser(encoding='your_encoding').

内容的提问来源于stack exchange，提问作者marisa