Thanks Snippsat:
I learned a lot about doing things from the command prompt as you showed me, and am grateful for your help.
I found a solution to the problem. I reviewed the Youtube video How to Fix PyCharm Import Error and Setup Your Interpreter from about 7:52 to 8:45 where he talks about the system interpreter. I don't know exactly what I did with the System Interpreter but now I don't have the problem.
I learned a lot about doing things from the command prompt as you showed me, and am grateful for your help.
I found a solution to the problem. I reviewed the Youtube video How to Fix PyCharm Import Error and Setup Your Interpreter from about 7:52 to 8:45 where he talks about the system interpreter. I don't know exactly what I did with the System Interpreter but now I don't have the problem.