import datapackage

dp = datapackage.DataPackage('http://data.okfn.org/data/core/gdp/datapackage.json')
brazil_gdp = [{'Year': int(row['Year']), 'Value': float(row['Value'])}
              for row in dp.resources[0].data if row['Country Code'] == 'BRA']

max_gdp = max(brazil_gdp, key=lambda x: x['Value'])
min_gdp = min(brazil_gdp, key=lambda x: x['Value'])
percentual_increase = max_gdp['Value'] / min_gdp['Value']

msg = (
    'The highest Brazilian GDP occured in {max_gdp_year}, when it peaked at US$ '
    '{max_gdp:1,.0f}. This was {percentual_increase:1,.2f}% more than its '
    'minimum GDP in {min_gdp_year}.'
).format(max_gdp_year=max_gdp['Year'],
         max_gdp=max_gdp['Value'],
         percentual_increase=percentual_increase,
         min_gdp_year=min_gdp['Year'])

print(msg)
# The highest Brazilian GDP occured in 2011, when it peaked at US$ 2,615,189,973,181. This was 172.44% more than its minimum GDP in 1960.

import datapackage

dp = datapackage.DataPackage('http://data.okfn.org/data/core/gdp/datapackage.json')
try:
    dp.validate()
except datapackage.exceptions.ValidationError as e:
    # Handle the ValidationError
    pass

import datapackage

# This descriptor has two errors:
#   * It has no "name", which is required;
#   * Its resource has no "data", "path" or "url".
descriptor = {
    'resources': [
        {},
    ]
}

dp = datapackage.DataPackage(descriptor)

for error in dp.iter_errors():
    # Handle error

import datapackage

dp = datapackage.DataPackage()
dp.descriptor['name'] = 'my_sleep_duration'
dp.descriptor['resources'] = [
    {'name': 'data'}
]

resource = dp.resources[0]
resource.descriptor['data'] = [
    7, 8, 5, 6, 9, 7, 8
]

with open('datapackage.json', 'w') as f:
  f.write(dp.to_json())
# {"name": "my_sleep_duration", "resources": [{"data": [7, 8, 5, 6, 9, 7, 8], "name": "data"}]}

import datapackage
import datapackage.registry

# This constant points to the official registry URL
# You can use any URL or path that points to a registry CSV
registry_url = datapackage.registry.Registry.DEFAULT_REGISTRY_URL
registry = datapackage.registry.Registry(registry_url)

descriptor = {}  # The datapackage.json file
schema = registry.get('tabular')  # Change to your schema ID

dp = datapackage.DataPackage(descriptor, schema)

from datapackage import push_datapackage, pull_datapackage

# Push
push_datapackage(
    descriptor='descriptor_path',
    backend='mystorage', **<mystorage_options>)

# Import
pull_datapackage(
    descriptor='descriptor_path', name='datapackage_name',
    backend='mystorage', **<mystorage_options>)