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Obtaining/compiling/installing python3.7

I wish to try some beta software which assumes python3.7 is installed. I have Debian 9.8 installed on a machine dedicated to this exercise. I did a web search and got a half dozen on topic hits. There were enough differences that I wasn't sure if I was missing something important. The last time I compiled something was on a PDP 11/45 in approximately 1975.