[Python] Pyttsx3 not saving MP3

Here is my code:

mp3_path = filedialog.asksaveasfile(filetypes=(("MP3 files", "*.mp3"),
("All files", "*.*"))) # User prompt to select a path.

engine = pyttsx3.init() # A pyttsx3 object

engine.setProperty('rate', 100) # Set speed to speed given in entry

engine.save_to_file('Hi and welcome to my audiobook.', mp3_path) # Save mp3 to specified path
engine.runAndWait()


Now, when I try to save the MP3, it doesn't work and the mp3 is empty. I copied and pasted the doc example but it still doesn't work.

I am using MacOS so installing espeak-ng is not needed too.

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