Get human readable version of file size?

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Addressing the above “too small a task to require a library” issue by a straightforward implementation (using f-strings, so Python 3.6+):

def sizeof_fmt(num, suffix="B"):
    for unit in ["", "Ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi"]:
        if abs(num) < 1024.0:
            return f"{num:3.1f}{unit}{suffix}"
        num /= 1024.0
    return f"{num:.1f}Yi{suffix}"

Supports:

  • all currently known binary prefixes
  • negative and positive numbers
  • numbers larger than 1000 Yobibytes
  • arbitrary units (maybe you like to count in Gibibits!)

Example:

>>> sizeof_fmt(168963795964)
'157.4GiB'

by Fred Cirera

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