def start_kernel(
cls,
kernelspec_name=None,
connection_info=None,
connection_name=None,
):
"""Start kernel and return a `Kernel` instance."""
kernel_id = uuid.uuid4()
if kernelspec_name:
kernel_manager = KernelManager(kernel_name=kernelspec_name)
kernel_manager.start_kernel()
elif connection_info:
kernel_manager = KernelManager()
kernel_manager.load_connection_info(connection_info)
# `KernelManager.kernel_name` is not automatically set from connection info.
kernel_manager.kernel_name = connection_info.get("kernel_name", "")
else:
raise Exception(
"You must specify any of {`kernelspec_name`, `connection_info`}."
)
kernel = KernelConnection(kernel_id,
kernel_manager,
cls,
connection_name=connection_name,
logger=cls.logger)
cls.kernels[kernel_id] = kernel
return kernel
