post_install.py

import subprocess
import sys

def install_fluidsynth():
    try:
        subprocess.check_call([
            'conda', 'install', '-c', 'conda-forge', 'fluidsynth', '-y'
        ])
    except subprocess.CalledProcessError as e:
        sys.exit(e.returncode)

if __name__ == "__main__":
    install_fluidsynth()