/usr/share/matplotlib/sampledata/testdata.csv is in python-matplotlib-data 1.1.1~rc1+git20120423-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | name,age
john,41
miriam,38
rahel,11
|