pycrunch 0.1.12

Using pycrunch

To use pycrunch in your project, run:

$ python setup.py develop

This will make the code in this directory available to other projects.

Getting started

Start a simple session via:

>>> import pycrunch
>>> session = pycrunch.Session("me@mycompany.com", password)
>>> site = session.get("https://beta.crunch.io/api/").payload

Then, you can browse the site. Use print to pretty-indent JSON payloads:

>>> print site
pycrunch.shoji.Catalog(**{
    "element": "shoji:catalog",
    "self": "https://beta.crunch.io/api/",
    "description": "The API root.",
    "catalogs": {
        "datasets": "https://beta.crunch.io/api/datasets/",
        "specifications": "https://beta.crunch.io/api/specifications/",
        ...
    },
    "urls": {
        "logout_url": "https://beta.crunch.io/api/logout/",
        ...
    },
    "views": {
        "migration": "https://beta.crunch.io/api/migration/"
    }
})

URI’s in payloads’ catalogs, views, fragments, and urls collections are followable automatically:

>>> print site.datasets
pycrunch.shoji.Catalog(**{
    "self": "https://beta.crunch.io/api/datasets/",
    "element": "shoji:catalog",
    "index": {
        "https://beta.crunch.io/api/datasets/dbf9fca7b727/": {
            "owner_display_name": "me@mycompany.com",
            "description": "",
            "id": "dbf9fca7b727",
            "owner_id": "https://beta.crunch.io/api/users/253b68/",
            "archived": false,
            "name": "Hog futures tracking (May 2014)"
        },
    },
    ...
})

Each recognized JSON payload also automatically gives dotted-attribute access to the members of each JSON object:

>>> print site.datasets.index.values()[0]
pycrunch.shoji.Tuple(**{
    "owner_display_name": "me@mycompany.com",
    "description": "",
    "id": "dbf9fca7b727",
    "owner_id": "https://beta.crunch.io/api/users/253b68/",
    "archived": false,
    "name": "Hog futures tracking (May 2014)"
})

Responses may also possess additional helpers, like the entity property of each Tuple in a catalog’s index, which follows the link to the Entity resource:

>>> print site.datasets.index.values()[0].entity_url
"https://beta.crunch.io/api/datasets/dbf9fca7b727/"

>>> print site.datasets.index.values()[0].entity
pycrunch.shoji.Entity(**{
    "self": "https://beta.crunch.io/api/datasets/dbf9fca7b727/",
    "element": "shoji:entity",
    "description": "Detail for a given dataset",
    "specification": "https://beta.crunch.io/api/specifications/datasets/",
    "body": {
        "archived": false,
        "user_id": "253b68",
        "name": "Hog futures tracking (May 2014)"
        "weight": "https://beta.crunch.io/api/datasets/dbf9fca7b727/variables/36f5404/",
        "creation_time": "2014-03-06T18:23:26.780752+00:00",
        "description": ""
    },
    "catalogs": {
        "batches": "https://beta.crunch.io/api/datasets/dbf9fca7b727/batches/",
        "joins": "https://beta.crunch.io/api/datasets/dbf9fca7b727/joins/",
        "variables": "https://beta.crunch.io/api/datasets/dbf9fca7b727/variables/",
        "filters": "https://beta.crunch.io/api/datasets/dbf9fca7b727/filters/",
        ...
    },
    "views": {
        "cube": "https://beta.crunch.io/api/datasets/dbf9fca7b727/cube/",
        ...
    },
    "urls": {
        "revision_url": "https://beta.crunch.io/api/datasets/dbf9fca7b727/revision/",
        ...
    },
    "fragments": {
        "table": "https://beta.crunch.io/api/datasets/dbf9fca7b727/table/"
    }
})

You typically add new resources to a Catalog via its create method:

>>> ds = site.datasets.create({"body": {
        'name': "My first dataset"
    }}, refresh=True)
>>> gender = ds.variables.create({"body": {
        'name': 'Gender',
        'alias': 'gender',
        'type': 'categorical',
        'categories': [
            {'id': -1, 'name': 'No Data', 'numeric_value': None, 'missing': True},
            {'id': 1, 'name': 'M', 'numeric_value': None, 'missing': False},
            {'id': 2, 'name': 'F', 'numeric_value': None, 'missing': False}
        ],
        'values': [1, 2, {"?": -1}, 2]
    }}, refresh=True)
>>> print ds.table.data
pycrunch.elements.JSONObject(**{
    "e7f361628": [
        1,
        2,
        {"?": -1},
        2
    ]
})