Size of files in human, readable form

[Martin Pool]

Thomas Weholt wrote:

> Just wondered if there are any modules/methods/ways to get a file`s size
> in kilobytes or megabytes etc, based on what`s appropriate? Probably a
> simple thing to do, but my attempts have failed.

As tim muddletin said, 

>>> import os,sys
>>> os.path.getsize(sys.executable)
24638
>>> os.stat(sys.executable)[6]
24638
>>>

to get the size of the file, and then something like this to convert to
human-readable form:

_abbrevs = [
    (1<<50L, 'P'),
    (1<<40L, 'T'), 
    (1<<30L, 'G'), 
    (1<<20L, 'M'), 
    (1<<10L, 'k'),
    (1, '')
    ]

def greek(size):
    """Return a string representing the greek/metric suffix of a size"""
    for factor, suffix in _abbrevs:
        if size > factor:
            break
    return `int(size/factor)` + suffix

You can change the comparison or int if you'd prefer to see things like
"3023kb" or "3.02Mb".

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