modify large randomly

random_modify.py

#!/usr/bin/env python

import os
import sys
import mmap
import string
import random
from pathlib import Path

def random_str(len):
    return ''.join(random.choices(string.ascii_letters + string.digits + string.whitespace, k=len))

def random_modify(file_path, count):
    p = Path(file_path)
    if(not os.path.exists(file_path)):
        p.touch()

    count = random.randint(1, count)
    with p.open('a') as f:
        size = os.path.getsize(file_path)
        for i in range(count):
            end = 0 if size == 0 else size - 1
            pos = random.randint(0, end)
            f.seek(pos)
            randstr_len = random.randint(1, 250)
            s = random_str(randstr_len)
            size += randstr_len
            print(i, size, end, pos, '\n')
            print("\n****\n")
            f.write(s)
            f.flush()

if __name__ == '__main__':
    if (len(sys.argv) != 3):
        print("Usage: python script.py file_path count")
        exit(-1)
    random_modify(sys.argv[1], int(sys.argv[2]))