I am getting a little bit confused. Have you been using SymPy and you are having difficulty getting the results to plot? If so, is that the reason why you are looking for another way to get your expressions plotted? If this is the case, then you need to take a completely different approach.
Obviously, if the Plot module in SymPy is not working, then your installation is somehow messed up and needs to be fixed. SymPy will do everything you need it to do. I suggest contacting the people on the SymPy mailing list:
and see if they can help you with the plotting issue. Be sure to tell them that you are having difficulty with importing the Plot module. Copy and paste the error message that you get so that they can help you resolve that issue.