Convert a textual PDF file to an audio book using Pyhon

pdf2audio.py

import PyPDF3
import pyttsx3
import pdfplumber
import os

pdf_file_path = r"path_to_pdf_file.pdf"
root, ext = os.path.splitext(pdf_file_path)
output_audio_file = root + ".mp3"

# get num of pages
book = open(pdf_file_path, "rb")
pdf_reader = PyPDF3.PdfFileReader(book)
pages_num = pdf_reader.numPages

# extract text from the textual file
extracted_text = "" 
with pdfplumber.open(pdf_file_path) as pdf:
    for i in range(0, pages_num):
        page = pdf.pages[i]
        extracted_text += page.extract_text()

# tts part
engine = pyttsx3.init()
engine.save_to_file(extracted_text, output_audio_file)
engine.runAndWait()