datadotworld 1.0.1

Python library for data.world

A python library for working with data.world datasets

Quick start

Install

You can install it using pip directly from PyPI:

pip install datadotworld

Optionally, you can install the library including pandas support:

pip install datadotworld[PANDAS]

Configure

Before you start using the library, you must first set it up with your access token. To do that, run the following command:

dw configure

Your API token can be obtained on data.world under Settings > Advanced

Load a dataset

The load_dataset() function facilitates maintaining copies of datasets on the local filesystem. It will download a given dataset’s datapackage and store it under ~/.dw/cache. When used subsequently, load_dataset() will use the copy stored on disk and will work offline, unless it’s called with force_update=True.

Once loaded, a dataset (data and metadata) can be conveniently accessed via the object returned by load_dataset().

Start by importing the datadotworld module:

import datadotworld as dw

Then, invoke the load_dataset() function, to download a dataset and work with it locally. For example:

intro_dataset = dw.load_dataset('jonloyens/an-intro-to-dataworld-dataset')

Dataset objects allow access to data via three different properties raw_data, tables and dataframes. Each of these properties is a mapping (dict) whose values are of type bytes, list and pandas.DataFrame, respectively. Values are lazy loaded and cached once loaded. Their keys are the names of the files contained in the dataset.

For example:

>>> intro_dataset.dataframes
LazyLoadedDict({
    'changelog': LazyLoadedValue(<pandas.DataFrame>),
    'datadotworldbballstats': LazyLoadedValue(<pandas.DataFrame>),
    'datadotworldbballteam': LazyLoadedValue(<pandas.DataFrame>)})

IMPORTANT: Not all files in a dataset are tabular, therefore some will be exposed via raw_data only.

Tables are lists of rows, each represented by a mapping (dict) of column names to their respective values.

For example:

>>> stats_table = intro_dataset.tables['datadotworldbballstats']
>>> stats_table[0]
OrderedDict([('Name', 'Jon'),
             ('PointsPerGame', Decimal('20.4')),
             ('AssistsPerGame', Decimal('1.3'))])

You can also review the metadata associated with a file or the entire dataset, using the describe function. For example:

>>> intro_dataset.describe()
{'homepage': 'https://data.world/jonloyens/an-intro-to-dataworld-dataset',
 'name': 'jonloyens_an-intro-to-dataworld-dataset',
 'resources': [{'format': 'csv',
   'name': 'changelog',
   'path': 'data/ChangeLog.csv'},
  {'format': 'csv',
   'name': 'datadotworldbballstats',
   'path': 'data/DataDotWorldBBallStats.csv'},
  {'format': 'csv',
   'name': 'datadotworldbballteam',
   'path': 'data/DataDotWorldBBallTeam.csv'}]}
>>> intro_dataset.describe('datadotworldbballstats')
{'format': 'csv',
 'name': 'datadotworldbballstats',
 'path': 'data/DataDotWorldBBallStats.csv',
 'schema': {'fields': [{'name': 'Name', 'title': 'Name', 'type': 'string'},
                       {'name': 'PointsPerGame',
                        'title': 'PointsPerGame',
                        'type': 'number'},
                       {'name': 'AssistsPerGame',
                        'title': 'AssistsPerGame',
                        'type': 'number'}]}}

Query a dataset

The query() function allows datasets to be queried live using SQL or SPARQL query languages.

To query a dataset, invoke the query() function. For example:

results = dw.query('jonloyens/an-intro-to-dataworld-dataset', 'SELECT * FROM DataDotWorldBBallStats')

Query result objects allow access to the data via raw_data, table and dataframe properties, of type json, list and pandas.DataFrame, respectively.

For example:

>>> results.dataframe
      Name  PointsPerGame  AssistsPerGame
0      Jon           20.4             1.3
1      Rob           15.5             8.0
2   Sharon           30.1            11.2
3     Alex            8.2             0.5
4  Rebecca           12.3            17.0
5   Ariane           18.1             3.0
6    Bryon           16.0             8.5
7     Matt           13.0             2.1

Tables are lists of rows, each represented by a mapping (dict) of column names to their respective values. For example:

>>> results.table[0]
OrderedDict([('Name', 'Jon'),
             ('PointsPerGame', Decimal('20.4')),
             ('AssistsPerGame', Decimal('1.3'))])

To query using SPARQL invoke query() using query_type='sparql', or else, it will assume the query to be a SQL query.

Just like in the dataset case, you can view the metadata associated with a query result using the describe() function.

For example:

>>> results.describe()
{'fields': [{'name': 'Name', 'type': 'string'},
            {'name': 'PointsPerGame', 'type': 'number'},
            {'name': 'AssistsPerGame', 'type': 'number'}]}

Create and update datasets

To create and update datasets, start by calling the api_client() function. For example:

client = dw.api_client()

The client supports various methods for creating and updating datasets and dataset files:

• create_dataset

• update_dataset

• replace_dataset

• get_dataset

• add_files_via_url

• sync_files

• upload_files

• delete_files

You can find more about those functions using help()