Last login: Sun May 13 13:24:10 on ttys000
Louis-MacBook-Pro:~ louisling$ sudo python /Users/louisling/Desktop/demo1.py 
Password:
Traceback (most recent call last):
  File "/Users/louisling/Desktop/demo1.py", line 1, in <module>
    from ROOT import gROOT, TCanvas, TF1
ImportError: No module named ROOT
Louis-MacBook-Pro:~ louisling$