/usr/share/matplotlib/sample_data/demodata.csv is in python-matplotlib-data 1.3.1-1ubuntu5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | clientid,date,weekdays,gains,prices,up
0,2008-04-30,Wed,-0.52458192906686452,7791404.0091921333,False
1,2008-05-01,Thu,0.076191536201738269,3167180.7366340165,True
2,2008-05-02,Fri,-0.86850970062880861,9589766.9613829032,False
3,2008-05-03,Sat,-0.42701083852713395,8949415.1867596991,False
4,2008-05-04,Sun,0.2532553652693274,937163.44375252665,True
5,2008-05-05,Mon,-0.68151636911081892,949579.88022264629,False
6,2008-05-06,Tue,0.0071911579626532168,7268426.906552773,True
7,2008-05-07,Wed,0.67449747200412147,7517014.782897247,True
8,2008-05-08,Thu,-1.1841008656818983,1920959.5423492221,False
9,2008-05-09,Fri,-1.5803692595811152,8456240.6198725495,False
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