How to use the micawber.providers.ProviderRegistry function in micawber

def bootstrap_basic(cache=None, registry=None):
    # complements of oembed.com#section7
    pr = registry or ProviderRegistry(cache)

    # c
    pr.register(r'http://chirb\.it/\S+', Provider('http://chirb.it/oembed.json'))
    pr.register(r'https?://www\.circuitlab\.com/circuit/\S+', Provider('https://www.circuitlab.com/circuit/oembed'))

    # d
    pr.register(r'https?://(?:www\.)?dailymotion\.com/\S+', Provider('http://www.dailymotion.com/services/oembed'))

    # f
    pr.register(r'https?://\S*?flickr\.com/\S+', Provider('https://www.flickr.com/services/oembed/'))
    pr.register(r'https?://flic\.kr/\S*', Provider('https://www.flickr.com/services/oembed/'))
    pr.register(r'https?://(?:www\.)?funnyordie\.com/videos/\S+', Provider('http://www.funnyordie.com/oembed'))

    # g
    pr.register(r'https?://gist\.github\.com/\S*', Provider('https://github.com/api/oembed'))

from django.core.cache import cache
from micawber.providers import Provider, ProviderRegistry

oembed_providers = ProviderRegistry(cache)

oembed_providers.register(
    r'http://\S*imgur\.com/\S+',
    Provider('http://api.imgur.com/oembed')
),
oembed_providers.register(
    r'https?://\S*?flickr.com/\S+',
    Provider('https://www.flickr.com/services/oembed/')
)
oembed_providers.register(
    r'https?://flic\.kr/\S*',
    Provider('https://www.flickr.com/services/oembed/')
)
oembed_providers.register(
    r'http://i\S*.photobucket.com/albums/\S+',
    Provider('http://photobucket.com/oembed')

def bootstrap_noembed(cache=None, registry=None, **params):
    endpoint = 'http://noembed.com/embed'
    schema_url = 'http://noembed.com/providers'

    pr = registry or ProviderRegistry(cache)

    # fetch the schema
    contents = fetch(schema_url)
    json_data = json.loads(contents)

    for provider_meta in json_data:
        for regex in provider_meta['patterns']:
            pr.register(regex, Provider(endpoint, **params))
    return pr

def bootstrap_oembed(cache=None, registry=None, **params):
    schema_url = 'https://oembed.com/providers.json'
    pr = registry or ProviderRegistry(cache)

    # Fetch schema.
    contents = fetch(schema_url)
    json_data = json.loads(contents)

    for item in json_data:
        for endpoint in item['endpoints']:
            # Possibly this provider only supports discovery via  tags,
            # which is not supported by micawber.
            if 'schemes' not in endpoint:
                continue

            # Consists of one or more schemes, a destination URL and optionally
            # a format, e.g. "json".
            url = endpoint['url']
            if '{format}' in url:

def bootstrap_embedly(cache=None, registry=None, **params):
    endpoint = 'http://api.embed.ly/1/oembed'
    schema_url = 'http://api.embed.ly/1/services/python'

    pr = registry or ProviderRegistry(cache)

    # fetch the schema
    contents = fetch(schema_url)
    json_data = json.loads(contents)

    for provider_meta in json_data:
        for regex in provider_meta['regex']:
            pr.register(regex, Provider(endpoint, **params))
    return pr