[Python] How do I use the MIDIUtil library without raising an Import Error?

I have already got MIDIUtil to work in the past without an import error on my Mac. For some reason, it has now stopped working and throws an import error, no matter how I try to change the file directory or the name of the module in my code:

ImportError: No module named midiutil


I am just trying to run the 'example' file located in the package:

#!/usr/bin/env python

from midiutil import MIDIFile

degrees = [60, 62, 64, 65, 67, 69, 71, 72] # MIDI note number
track = 0
channel = 0
time = 0 # In beats
duration = 1 # In beats
tempo = 60 # In BPM
volume = 100 # 0-127, as per the MIDI standard

MyMIDI = MIDIFile(1) # One track
MyMIDI.addTempo(track, time, tempo)

for i, pitch in enumerate(degrees):
MyMIDI.addNote(track, channel, pitch, time + i, duration, volume)

with open("major-scale.mid", "wb") as output_file:
MyMIDI.writeFile(output_file)


I have read some stack overflow posts on this subject, who recommend:

from midiutil.MidiFile import MIDIFile


and:

from midiutil.MidiFile3 import MIDIFile


I seem to have tried every option, but there is definitely something that I am missing!

I am a beginner at Python and coding in general so thanks in advance for the help!

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