Bytes to human-readable format

human_size.py

# Formats `n` bytes into human representation.
#
# Sample usage:
#
#   >>> human_size(10)
#   '10 B'
#
#   >>> human_size(1_048)
#   '1 KB'
#
#   >>> human_size(10_000_000)
#   '9 MB'
#
#   >>> human_size(10_000_000_000)
#   '9 GB'
#
def human_size(n, units=('B','KB','MB','GB','TB', 'PB', 'EB')):
    n = int(n)

    if n < 1024:
        return f'{n} {units[0]}'

    return human_size(n >> 10, units[1:])