qiskit/providers/providerutils.py
def filter_backends(backends, filters=None, **kwargs):
    """Return the backends matching the specified filtering.

    Filter the `backends` list by their `configuration` or `status`
    attributes, or from a boolean callable. The criteria for filtering can
    be specified via `**kwargs` or as a callable via `filters`, and the
    backends must fulfill all specified conditions.

    Args:
        backends (list[BaseBackend]): list of backends.
        filters (callable): filtering conditions as a callable.
        **kwargs (dict): dict of criteria.

    Returns:
        list[BaseBackend]: a list of backend instances matching the
            conditions.
    """
    def _match_all(obj, criteria):
        """Return True if all items in criteria matches items in obj."""
        return all(getattr(obj, key_, None) == value_ for
                   key_, value_ in criteria.items())

    # Inspect the backends to decide which filters belong to
    # backend.configuration and which ones to backend.status, as it does
    # not involve querying the API.
    configuration_filters = {}
    status_filters = {}
    for key, value in kwargs.items():
        if all(key in backend.configuration() for backend in backends):
            configuration_filters[key] = value
        else:
            status_filters[key] = value

    # 1. Apply backend.configuration filtering.
    if configuration_filters:
        backends = [b for b in backends if
                    _match_all(b.configuration(), configuration_filters)]

    # 2. Apply backend.status filtering (it involves one API call for
    # each backend).
    if status_filters:
        backends = [b for b in backends if
                    _match_all(b.status(), status_filters)]

    # 3. Apply acceptor filter.
    backends = list(filter(filters, backends))

    return backends
def filter_backends(backends, filters=None, **kwargs):
    def _match_all(obj, criteria):
        """Return True if all items in criteria matches items in obj."""
        return all(getattr(obj, key_, None) == value_ for
                   key_, value_ in criteria.items())

    # Inspect the backends to decide which filters belong to
    # backend.configuration and which ones to backend.status, as it does
    # not involve querying the API.
    configuration_filters = {}
    status_filters = {}
    for key, value in kwargs.items():
        if all(key in backend.configuration() for backend in backends):
            configuration_filters[key] = value
        else:
            status_filters[key] = value

    # 1. Apply backend.configuration filtering.
    if configuration_filters:
        backends = [b for b in backends if
                    _match_all(b.configuration(), configuration_filters)]

    # 2. Apply backend.status filtering (it involves one API call for
    # each backend).
    if status_filters:
        backends = [b for b in backends if
                    _match_all(b.status(), status_filters)]

    # 3. Apply acceptor filter.
    backends = list(filter(filters, backends))

    return backends
def filter_backends ( backends , filters = None , * * kwargs ) : def _match_all ( obj , criteria ) : """Return True if all items in criteria matches items in obj.""" return all ( getattr ( obj , key_ , None ) == value_ for key_ , value_ in criteria . items ( ) ) # Inspect the backends to decide which filters belong to # backend.configuration and which ones to backend.status, as it does # not involve querying the API. configuration_filters = { } status_filters = { } for key , value in kwargs . items ( ) : if all ( key in backend . configuration ( ) for backend in backends ) : configuration_filters [ key ] = value else : status_filters [ key ] = value # 1. Apply backend.configuration filtering. if configuration_filters : backends = [ b for b in backends if _match_all ( b . configuration ( ) , configuration_filters ) ] # 2. Apply backend.status filtering (it involves one API call for # each backend). if status_filters : backends = [ b for b in backends if _match_all ( b . status ( ) , status_filters ) ] # 3. Apply acceptor filter. backends = list ( filter ( filters , backends ) ) return backends
Return the backends matching the specified filtering.

    Filter the `backends` list by their `configuration` or `status`
    attributes, or from a boolean callable. The criteria for filtering can
    be specified via `**kwargs` or as a callable via `filters`, and the
    backends must fulfill all specified conditions.

    Args:
        backends (list[BaseBackend]): list of backends.
        filters (callable): filtering conditions as a callable.
        **kwargs (dict): dict of criteria.

    Returns:
        list[BaseBackend]: a list of backend instances matching the
            conditions.
Return the backends matching the specified filtering .