Use tqdm while reading a file (without reading the entire file into memory)

readfile.py

import subprocess
import tqdm
import os
import argparse


def get_line_count(file):
    abs_path = os.path.abspath(file)
    completed_process = subprocess.run(args=['wc', '-l', abs_path], check=True, encoding='utf-8',
                                       stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    return int(completed_process.stdout.split()[0])


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument('file')
    args = parser.parse_args()

    line_count = get_line_count(args.file)
    t = tqdm.tqdm(total=line_count, ncols=100)
    with open(args.file, 'r') as file:
        for line in file:
            # do stuff with this line
            # at some point, call:
            t.update()
    t.close()

if __name__ == '__main__':
    main()