upstream/ipython Files · IPython/testing/__main__.py

avoid race condition when deleting/starting sessions...

avoid race condition when deleting/starting sessions javascript doesn't guarantee the order of AJAX requests, so we give `Session.delete` and `Kernel.kill` a callback signature. Changing the kernel type calls `Notebook.start_kernel`, which terminates the previous session, if defined, before starting the new one. A flag is stored, to prevent multiple simultaneous attempts to start sessions, raising a SessionAlreadyStarting Error, preventing the spec_changed event from firing.

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      if __name__ == '__main__':

          from IPython.testing import iptestcontroller

          iptestcontroller.main()

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				if __name__ == '__main__':
				from IPython.testing import iptestcontroller
				iptestcontroller.main()