PyTables User's Guide: Hierarchical datasets in Python - Release 1.3.3
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# 6.2. Finding a FileNode node

FileNode nodes can be recognized because they have a `NODE_TYPE` system attribute with a `'file'` value. It is recommended that you use the `getNodeAttr()` method (see 4.2.2) of `tables.File` class to get the `NODE_TYPE` attribute independently of the nature (group or leaf) of the node, so you do not need to care about.

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