Generate random string with given prefix (Python3)

utils.py

import random
import string


def random_str(prefix="", size=10) -> str:
    """Generate random string with given prefix.

    Args:
        prefix : Prefix of string
        size : Random string's total size
    """
    s = "".join(
        [random.choice(string.digits + string.ascii_lowercase) for i in range(size)]
    )
    return (prefix + s)[:size]