Скачать или смотреть How to Fix None Returns When Parsing XML in Python

Learn how to effectively parse XML strings in Python using ElementTree, and resolve the common issue of getting `None` when trying to access attributes.
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This video is based on the question https://stackoverflow.com/q/68632543/ asked by the user 'Haru Jeong' ( https://stackoverflow.com/u/13586906/ ) and on the answer https://stackoverflow.com/a/68632969/ 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 Fix None Returns When Parsing XML in Python

XML (eXtensible Markup Language) is widely used for storing and transporting data. When working with XML in Python, one common task is to parse an XML string to extract useful information. However, while trying to parse XML data using Python’s xml.etree.ElementTree module, you might encounter an issue where findall() returns an empty list or None attributes. In this post, we will explore the reasons behind this problem and how to resolve it effectively.

Understanding the Problem

In the example provided:

[[See Video to Reveal this Text or Code Snippet]]

When tree.findall('Parameter') is called, it returns an empty list. This occurs because the XML elements are defined within a specific namespace (xmlns="http://www.nexacroplatform.com/platfo..."), and the search for the Parameter tag must account for this namespace.

Solution: Adjusting for Namespaces

To solve this issue, we need to modify our code to include the namespace when searching for Parameter elements. Below is the corrected code:

[[See Video to Reveal this Text or Code Snippet]]

Output

When the above code is executed, you will get the following output:

[[See Video to Reveal this Text or Code Snippet]]

Key Takeaways

Namespaces Matter: When working with XML that has a namespace, always include it in your search queries. This ensures that you accurately target the elements you want to access.

Use XPath Syntax: The .//{namespace}tagname syntax allows you to search for elements within namespaces correctly.

By following these steps, you can successfully parse XML strings in Python without running into issues of empty lists or None returns. Happy coding!