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Handle some tricky Comm lifecycle issues...
Handle some tricky Comm lifecycle issues * If the comm was a primary comm, but there was an error opening it, _closed was False, which is wrong * If Comm.close() was called, but an error happened, it still appeared to be open This change makes the _closed attribute more conservative. If _closed is False, the comm is definitely open for messages. If _closed is True, we either didn't initialize correctly, or we tried to close at some point.

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test_example.txt
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Tests in example form - pure python
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This file contains doctest examples embedded as code blocks, using normal
Python prompts. See the accompanying file for similar examples using IPython
prompts (you can't mix both types within one file). The following will be run
as a test::
>>> 1+1
2
>>> print ("hello")
hello
More than one example works::
>>> s="Hello World"
>>> s.upper()
'HELLO WORLD'
but you should note that the *entire* test file is considered to be a single
test. Individual code blocks that fail are printed separately as ``example
failures``, but the whole file is still counted and reported as one test.