> > > Thanks Matthew Lefavor! But specifically, why use "#!/usr/bin/env python3" > instead of "#!/usr/bin/python3"? >
The "env" program looks up its argument in the current $PATH environment variable, and then executes that. This means you aren't necessarily tied to /usr/bin/python3. It makes things more portable. For example, old Linux distributions don't have Python 3 installed with them, and the user might not have permissions to install Python 3 system-wide. Instead they have it in some sort of ~/HOME/bin directory, and then that is placed on the path by their .bashrc file. If your shebang line was "#!/usr/bin/python3", the program wouldn't work without them changing that line. If the shebang ling was "#!/usr/bin/env python3", it would find the Python3 binary no problem.
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