To format bytes to human readable Size in Python you can use the following snippet.
Sample Python
fileSize = 12454162221
for count in ['Bytes','KB','MB','GB']:
if fileSize > -1024.0 and fileSize < 1024.0:
print "%3.1f%s" % (fileSize, count)
fileSize /= 1024.0
print "%3.1f%s" % (fileSize, 'TB')
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