It is best practice to use `/usr/bin/env python3` instead of a hard
coded path. This will search for "python3" in the PATH environment
variable.
Most Linux distributions install python to "/usr/bin". Most BSDs to
"/usr/local/bin".
Signed-off-by: Stefan Hagen <github@textmail.me>
Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
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