plot() command in load .sage script

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plot(f,(x,-3,3)) defines a graphical object. From a .sage script, this is just the object.

When you call an object from the command line, it wants to be represented, by calling the hidden .__repr__() method. For a plot object, the .__repr__() method just calls the .show() method.

Hence, if you want your .sage script to show the graphical object you defined with the command plot, you should tell it explicitely, by writing:

plot(f,(x,-3,3)).show()

instead of just

plot(f,(x,-3,3))

As a comparison, it is the same difference between

2

and

print(2)

Both will output 2 in the command line, but only the second will write something when called from a .sage script.