A python method that returns the human-readable size of a file.

python_human_readable_file_size.py

#!/usr/bin/env python
# Author: James Cherti
# License: MIT
# URL: https://gist.github.com/jamescherti/b8badae104576edc082f5095bfe0652f
"""Return the human-readable size of a file."""

from typing import Union

def human_readable_file_size(file_size: Union[int, float]) -> str:
    """Return the human-readable size of a file."""
    for unit in ["", "Kb", "Mb", "Gb", "Tb"]:
        if file_size < 1024.0:
            return "{:g} {}".format(round(file_size, 1), unit)
        file_size = file_size / 1024.0
    return str(file_size)


def main():
    """Test human_readable_file_size()."""
    print(human_readable_file_size(1023))
    print(human_readable_file_size(1024))
    print(human_readable_file_size(1024 + 512))
    print(human_readable_file_size(1024 * 1024))
    print(human_readable_file_size(1024 * 1024 * 1024))
    print(human_readable_file_size(1024 * 1024 * 1024 * 1024))

if __name__ == '__main__':
    main()

Output:

1023
1 Kb
1.5 Kb
1 Mb
1 Gb
1 Tb