I'm trying to understand one of the answers to this question:

Cannot pass an argument to python with "#!/usr/bin/env python"

#!/bin/sh
''''exec python -u -- "$0" ${1+"$@"} # '''

This works well, but I do not understand why it works with four ticks at the beginning of that line rather than three.

In addition, why the hash near the end of that string?

python bash arguments sh shebang
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