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Merge pull request #1331 from ellisonbg/celltypes...
Merge pull request #1331 from ellisonbg/celltypes Added plaintext and heading cells to the notebook UI and nbformat. In the process we have updated the nbformat to v3 and integrated these new cell types into the new toolbar.

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helloworld.ipynb
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Distributed hello world

Originally by Ken Kinder (ken at kenkinder dom com)

In [1]:
from IPython.parallel import Client
In [2]:
rc = Client()
view = rc.load_balanced_view()
In [3]:
def sleep_and_echo(t, msg):
    import time
    time.sleep(t)
    return msg
In [4]:
world = view.apply_async(sleep_and_echo, 3, 'World!')
hello = view.apply_async(sleep_and_echo, 2, 'Hello')
In [5]:
print "Submitted tasks:", hello.msg_ids, world.msg_ids
print hello.get(), world.get()
Submitted tasks: ['dd1052e0-aa75-4b25-9d35-ecbdaf6e3ed7'] ['1b46aa21-20d1-459c-bc36-2d8d03336f74']
Hello
 World!