Opening canvas in a pyroot program

Yes, I think that PyROOT in general has some preconditions before a canvas will even display permanently on the screen:

To even get the canvases to display when I run my code, I have to write:

$ python

execfile(“prob_bin.py”)

In other words, if I run this program from the linux command line

$ python prob_bin.py

the canvases do not even display for more than a second before they vanish (see Display canvas)