One-key eject all external storage devices from macOS (works with external hard drives and USB devices, not tested with disc drives)

eject.py

#!/usr/bin/python

import os,re, subprocess

diskUtilList = os.popen('diskutil list').read()

externalPhysicalRegEx = r".*\/dev\/(disk((?:\d+))) \(external\, physical\).*"
extDiskIntRegex = r".*\/dev\/disk(\d+) \(external\, physical\).*"

diskList = re.findall(extDiskIntRegex, diskUtilList)

for disk in diskList:
    diskint = int(disk)
    match = "disk"+str(disk)
    print('Found '+ match)

    #Check if there are any APFS Volumes
    APFSVolCount = re.findall(r"Apple_APFS.*disk"+disk+r"s",diskUtilList)

    #Do unmount APFS procedure if there are any APFS Containers
    if len(APFSVolCount) == 0:
        print('No APFS Containers on this drive, skipping ...')
    else:
        if len(APFSVolCount) == 1:
            containerString = 'Container'
        else:
            containerString = 'Containers'
        print('\nFound '+ str(len(APFSVolCount)) + ' APFS '+containerString)

        #Unmount APFS volumes individually
        for APFSVols in APFSVolCount:
            diskassg = re.findall(r"Apple_APFS.*(disk\d+)(?!s)", APFSVols)
            print('Processing '+ ', '.join(diskassg))
            for motherVolume in diskassg:
                print('\nUnmounting APFS Volumes on ' + motherVolume)
                APFSvolumesList = re.findall(r"APFS Volume.*("+motherVolume+r"s\d+).*", diskUtilList)
                APFSvolumesListPrint = ', '.join(APFSvolumesList)
                print('APFS Volumes found: ' + APFSvolumesListPrint)
                for APFSVolume in APFSvolumesList:
                    print("Unmounting " + APFSVolume + " ...")
                    unmountProcess = subprocess.Popen('diskutil unmountDisk force '+APFSVolume, shell=True, stdout=subprocess.PIPE)
                    unmountProcess.wait()
                    if unmountProcess.returncode == 0:
                        print('Unmounted successfully')
                    else:
                        print('Unexpected error occured')
    #To unmount other volumes
    volumesList = re.findall(r".*(disk"+disk+r"s\d+).*", diskUtilList)
    volumesList = list(dict.fromkeys(volumesList))
    for volume in volumesList:
        print("\nUnmounting "+ volume + '...')
        unmountProcess = subprocess.Popen('diskutil unmountDisk force '+volume, shell=True, stdout=subprocess.PIPE)
        unmountProcess.wait()
        if unmountProcess.returncode == 0:
            print('Unmounted successfully')
        else:
            print('Unexpected error occured')

    #Eject disk after unmounting, hard drives should shut itself down
    print("\nEjecting " + match + " ...")
    unmountDiskProcess = subprocess.Popen('diskutil unmountDisk force '+match, shell=True, stdout=subprocess.PIPE)
    unmountDiskProcess.wait()
    if unmountDiskProcess.returncode == 0:
        print('Unmounted successfully')
    else:
        print('Unexpected error occured')
    ejectDiskProcess = subprocess.Popen('diskutil eject '+match, shell=True, stdout=subprocess.PIPE)
    ejectDiskProcess.wait()
    if ejectDiskProcess.returncode == 0:
        print('Ejected successfully')
    else:
        print('Unexpected error occured')