pretty.py

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def prettySize(size):
        suffixes = [("B",2**10), ("K",2**20), ("M",2**30), ("G",2**40), ("T",2**50)]
        for suf, lim in suffixes:
                if size > lim:
                        continue
                else:
                        return round(size/float(lim/2**10),2).__str__()+suf

if (__name__ == '__main__'):
        print prettySize(213458923)
        # Output: 203.57M
        
        print prettySize(1234)
        # Output: 1.21K