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/usr/lib/python2.7/dist-packages/ipykernel/inprocess/constants.py is in python-ipykernel 4.5.2-2.

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"""Shared constants.
"""

# Because inprocess communication is not networked, we can use a common Session
# key everywhere. This is not just the empty bytestring to avoid tripping
# certain security checks in the rest of Jupyter that assumes that empty keys
# are insecure.
INPROCESS_KEY = b'inprocess'