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Error "AttributeError: object" NoneType "does not have a core attribute when using just vpython

I'm just starting to try using vpython, hoping to eventually use it to simulate an elliptical or parabolic orbit. I downloaded the module and tried to create a simple sphere, and when I do this, I get the above error. As far as I can tell, I correctly defined / named the function. Here is my code

from vpython import *
Sun = sphere(pos=(0,0,0), radius =0.5))
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vpython IPython ( Python , , - python).

vpython PPL REPL, get_ipython() None, .

IPython - Jupyter, http://jupyter.org/. jupyter notebook, , , .

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:

from visual import *
Sun = sphere(pos=(0,0,0), radius=0.5))

http://www.vpython.org/contents/docs_vp5/visual/VPython_Intro.pdf

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