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What does this line of code mean? Without it, my python3 http server can’t understand and let the browser download an empty .py file (depend on the link to the .py file)
#! /usr/local/bin/python3
It’s not a Python thing, it a hashbang (or shebang) line which indicates which interpreter should process the file.
The rules vary but, in its simplest form, a file with the name
xyz(containing that as the first line), when run from the command line withxyz, will run it using that interpreter, similar to: