Скачать или смотреть How to Properly Update CDATA Sections in XML Using Python xml.etree.ElementTree

Learn how to effectively parse and update CDATA sections in XML documents using Python's `xml.etree.ElementTree` library to retain the structure and content you need.
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This video is based on the question https://stackoverflow.com/q/62668479/ asked by the user 'user1619472' ( https://stackoverflow.com/u/1619472/ ) and on the answer https://stackoverflow.com/a/62672959/ provided by the user 'balderman' ( https://stackoverflow.com/u/415016/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Properly Update CDATA Sections in XML Using Python

When working with XML in Python, especially when CDATA sections are involved, it can be challenging to parse and update necessary values without losing the integrity of the overall structure. If you've found yourself in a situation like this, you're not alone. In this blog, we'll tackle a common problem of updating a value in a CDATA section of an XML document using Python's xml.etree.ElementTree module.

Problem Breakdown

You may have an XML document that includes a CDATA section, which contains nested XML elements. When attempting to update a specific value, such as the value of <f1>, you notice that the overall structure gets lost, and only the content of the CDATA section remains.

Sample XML

Consider the following XML structure:

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The Goal

Your goal is to change the value of <f1> from 10 to, say, 999, while retaining the entire structure of the original XML.

Solution Steps

To achieve this, we'll walk through a simple yet effective solution using Python's XML parsing capabilities. Here’s how you can do it:

1. Import the Required Module

To get started with XML parsing, ensure you import the ElementTree module.

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2. Define Your XML String

Start by defining your XML string.

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3. Parse the XML and Update the Value

Next, we parse the XML and update the desired value in the CDATA section.

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4. Expected Output

After running the above code, your output will be:

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Conclusion

Final Thoughts

Updating values within CDATA sections can be tricky, but with a clear understanding of how to parse XML and handle nested elements, you can efficiently manage and manipulate your XML documents. The method provided above retains the necessary structure while allowing for the modification of values as needed.

If you encounter any challenges or have questions while implementing this solution, feel free to reach out in the comments!