def registered_providers():
"""Return the currently registered providers.
.. deprecated:: 0.6+
After 0.6, this function is deprecated. Please use the methods in
`qiskit.IBMQ` instead (`active_accounts()`).
"""
warnings.warn(
'registered_providers() will be deprecated after 0.6. Please '
'use the qiskit.IBMQ.active_accounts() method instead.',
DeprecationWarning)
return IBMQ.active_accounts()
def __init__(self, wires, provider=None, backend="ibmq_qasm_simulator", shots=1024, **kwargs):
token = os.getenv("IBMQX_TOKEN") or kwargs.get("ibmqx_token", None)
url = os.getenv("IBMQX_URL") or kwargs.get("ibmqx_url", None)
if token is not None:
# token was provided by the user, so attempt to enable an
# IBM Q account manually
ibmq_kwargs = {"url": url} if url is not None else {}
IBMQ.enable_account(token, **ibmq_kwargs)
else:
# turn off deprecation warnings
# TODO: remove IBM Q v1 API calls when fully deprecated
with warnings.catch_warnings():
warnings.filterwarnings("ignore", category=DeprecationWarning)
# check if an IBM Q account is already active.
#
# * IBMQ v1 credentials stored in active_accounts().
# If no accounts are active, it returns []
#
# * IBMQ v2 credentials stored in active_account().
# If no accounts are active, it returns None.
if IBMQ.active_account() is None and not IBMQ.active_accounts():
# no active account
try:
# attempt to load a v1 account stored on disk
IBMQ.load_accounts()
except IBMQAccountError:
try:
# attempt to load a v2 account stored on disk
IBMQ.load_account()
except IBMQAccountError:
# attempt to enable an account manually using
# a provided token
raise IBMQAccountError(
"No active IBM Q account, and no IBM Q token provided."
) from None
# IBM Q account is now enabled
# get a provider
p = provider or IBMQ.get_provider()
super().__init__(wires=wires, provider=p, backend=backend, shots=shots, **kwargs)
