Working with Paths#

Paths provide a way to navigate, reference, and create nodes in the notebook tree using Unix-style slash-separated strings. This is an alternative to chained index access and is especially useful when working with deeply nested structures.

Warning

For duplicate-name and first-match lookup behavior, see Accessing Items with Index. This page focuses on path syntax and traversal rules.

from labapi import TraversalError

# Index access (chained)
page = notebook["Experiments"]["2024"]["Results"]

# Path-based (equivalent)
page = notebook.traverse("Experiments/2024/Results")

try:
    notebook.traverse("Experiments/2024/Results/Figure 1")
except TraversalError:
    # An intermediate segment exists but is not a directory
    ...

Traversing the Tree#

The traverse() method is available on any tree node and accepts a slash-separated path string.

folder = notebook.traverse("Experiments")
page = notebook.traverse("Experiments/2024/Results")

Note

If duplicate sibling names appear in a path segment, traverse() selects the first match for that segment. For deterministic selection, index from the parent container with Index.Id (see Accessing Items with Index).

Absolute vs Relative Paths#

Paths starting with / are absolute — they are resolved from the notebook root regardless of where you call traverse.

# Relative: resolved from `folder`
page = folder.traverse("2024/Results")

# Absolute: always resolved from the notebook root
page = folder.traverse("/Experiments/2024/Results")

Parent Navigation#

Use .. to navigate to the parent container.

parent = page.traverse("..")
grandparent = page.traverse("../..")

Note

To inspect duplicate child names under a container, use explicit indexing on that container (for example, container[Index.Name: "Results"]) to retrieve all matches; then use Index.Id to select exactly one (see Accessing Items with Index).

Warning

Nodes with the literal name ".." cannot be accessed via traverse, as .. is reserved for parent navigation.

Enumerating Descendants#

The enumeration methods return relative path strings for all descendants, up to a specified depth. This is useful for listing or searching the tree without fetching every node individually.

# All descendants (directories and pages), depth 1 (default)
notebook.enumerate_all()
# e.g. ["Experiments", "Experiments/2024", "Protocols"]

# Only directories
notebook.enumerate_dirs(depth=2)

# Only pages
notebook.enumerate_pages(depth=2)

depth defaults to 1 (immediate children only). To fetch the full tree you can increase it, but be aware that this makes one API request per directory level visited.

# Enumerate up to 3 levels deep
all_paths = notebook.enumerate_all(depth=3)

for path in all_paths:
    node = notebook.traverse(path)
    print(path, "->", node.id)

Creating Nodes with Paths#

The create() method accepts a path string (or NotebookPath) as the name argument. When a multi-segment path is provided, you must pass parents=True to allow intermediate directories to be created automatically.

from labapi import NotebookPage, NotebookDirectory

# Create a page at a nested path; intermediate directories are created as needed
page = notebook.create(NotebookPage, "Experiments/2024/Results", parents=True)

# Without parents=True, a ValueError is raised if an intermediate directory is missing
page = notebook.create(NotebookPage, "Experiments/2024/Results")  # raises if missing

See Creating Pages and Entries for details on the if_exists parameter and other creation options.

Convenience Methods: dir() and page()#

For common “ensure this path exists” workflows, use the convenience methods dir() and page().

These methods are shorthand for create() with:

  • parents=True (create missing intermediate directories), and

  • if_exists=InsertBehavior.Retain (return an existing matching node instead of raising).

from labapi import NotebookDirectory, NotebookPage, InsertBehavior

# Equivalent calls:
reports_dir = notebook.dir("Experiments/2024/Reports")
reports_dir = notebook.create(
    NotebookDirectory,
    "Experiments/2024/Reports",
    parents=True,
    if_exists=InsertBehavior.Retain,
)

summary_page = notebook.page("Experiments/2024/Summary")
summary_page = notebook.create(
    NotebookPage,
    "Experiments/2024/Summary",
    parents=True,
    if_exists=InsertBehavior.Retain,
)

When to Use Them#

Use dir() and page() when you want concise, idempotent setup code. They are especially useful in scripts that may run repeatedly.

# Safe to run multiple times; existing nodes are returned.
notebook.dir("Experiments/2024").page("Results")
notebook.page("Experiments/2024/Raw Data")

Because both methods retain existing nodes, calling them again for the same path returns the existing directory/page instead of creating a duplicate.

They can also be used for navigation when you expect the path to already exist: the same call either returns the existing node or creates it if missing.

# Navigate to an existing directory (or create it if needed)
reports = notebook.dir("Experiments/2024/Reports")

# Navigate to an existing page (or create it if needed)
summary = notebook.page("Experiments/2024/Summary")

The NotebookPath Class#

NotebookPath is a structured path object that can be constructed from nodes or strings, combined with /, and converted back to strings. It is used internally by traverse and create, but is also available for your own path logic.

Constructing a path from a node:

from labapi import NotebookPath

path = NotebookPath(folder)
print(path)           # /Experiments/2024
print(path.name)      # 2024  (last segment)
print(path.parts)     # ['Experiments']  (all but last)
print(path.is_absolute())  # True

Constructing from a string:

abs_path = NotebookPath("/Experiments/2024")
rel_path = NotebookPath("2024/Results")

Combining paths with ``/``:

base = NotebookPath(notebook)          # /
path = base / "Experiments" / "2024"  # /Experiments/2024

Resolving relative paths:

rel = NotebookPath("Results")
abs_path = rel.resolve(NotebookPath(folder))  # /Experiments/2024/Results

Getting a relative path between two nodes:

page_path = NotebookPath(page)                  # /Experiments/2024/Results
rel = page_path.relative_to(folder)             # Results  (relative to /Experiments/2024)

Checking containment:

page_path.is_relative_to(folder)   # True if page is inside folder
page_path.is_relative_to(notebook) # True (everything is inside the notebook)