Getting Data from a Package

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The examples in this section use the aleksey/hurdat demo package:
import quilt3
p = quilt3.Package.browse('aleksey/hurdat', 's3://quilt-example')
p
Loading manifest: 100%|██████████| 7/7 [00:00<00:00, 8393.40entries/s]
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(remote Package)
 └─.gitignore
 └─.quiltignore
 └─notebooks/
   └─QuickStart.ipynb
 └─quilt_summarize.json
 └─requirements.txt
 └─scripts/
   └─build.py
Slicing through a package
Use dict key selection to slice into a package tree:
# returns PackageEntry("requirements.txt")
p["requirements.txt"]
PackageEntry('s3://quilt-example/aleksey/hurdat/requirements.txt?versionId=bQtxuZlaylNVHi0GmxkSMofT5qXJvP95')
<!--pytest-codeblocks:cont-->
# returns (remote Package)
p["notebooks"]
(remote Package)
 └─QuickStart.ipynb
Slicing into a Package directory returns another Package rooted at that subdirectory. Slicing into a package entry returns an individual PackageEntry.
Downloading package data to disk
To download a subset of files from a package directory to a dest, use fetch:
# download a subfolder
p["notebooks"].fetch()
​
# download a single file
p["notebooks"]["QuickStart.ipynb"].fetch()
​
# download everything
p.fetch()
Copying objects: 100%|██████████| 36.7k/36.7k [00:01<00:00, 22.7kB/s]
100%|██████████| 36.7k/36.7k [00:01<00:00, 24.1kB/s]
Copying objects: 100%|██████████| 39.9k/39.9k [00:02<00:00, 16.5kB/s]
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(local Package)
 └─.gitignore
 └─.quiltignore
 └─notebooks/
   └─QuickStart.ipynb
 └─quilt_summarize.json
 └─requirements.txt
 └─scripts/
   └─build.py
fetch will default to downloading the files to the current directory, but you can also specify an alternative path:
p["notebooks"]["QuickStart.ipynb"].fetch("./references/")
100%|██████████| 36.7k/36.7k [00:01<00:00, 22.5kB/s]
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PackageEntry('file:///Users/gregezema/Documents/programs/quilt/docs/Walkthrough/references/')
Downloading package data into memory
Alternatively, you can download data directly into memory:
p["quilt_summarize.json"].deserialize()
['notebooks/QuickStart.ipynb']
To apply a custom deserializer to your data, pass the function as a parameter to the function. For example, to load a hypothetical yaml file using yaml.safe_load:
import yaml
# returns a dict
p["quilt_summarize.json"].deserialize(yaml.safe_load)
['notebooks/QuickStart.ipynb']
The deserializer should accept a byte stream as input.
Getting entry locations
You can get the path to a package entry or directory using get:
# returns /path/to/pkg/root/notebooks/QuickStart.ipynb
p["notebooks"]["QuickStart.ipynb"].get()
's3://quilt-example/aleksey/hurdat/notebooks/QuickStart.ipynb?versionId=PH.9gsCH6LM9RQIqsy1U4X6H6s.VoQ_B'
Getting metadata
Metadata is available using the meta property.
# get entry metadata
p["notebooks"]["QuickStart.ipynb"].meta
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# get directory metadata
p["notebooks"].meta
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# get package metadata
p.meta
Walkthrough - Previous
Installing a Package
Next - Walkthrough
Working with the Catalog
Last modified 2d ago
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Outline
Slicing through a package
Downloading package data to disk
Downloading package data into memory
Getting entry locations
Getting metadata