/usr/lib/python2.7/dist-packages/sage/version.py is in sagemath-common 8.1-7ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | # Sage version information for Python scripts
# This file is auto-generated by the sage-update-version script, do not edit!
version = '8.1'
date = '2017-12-07'
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