common/prettysize.py
author Radek Brich <radek.brich@devl.cz>
Mon, 18 Jul 2011 17:39:37 +0200
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Fix pgmanager exceptions. Add CLI tools: bigtables, longqueries, schemadiff.
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# -*- coding: utf-8 -*-
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#
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# prettysize - print data sizes in format easily readable by humans
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#
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# Copyright (c) 2011  Radek Brich <radek.brich@devl.cz>
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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iec_prefixes = ('Ki', 'Mi', 'Gi', 'Ti', 'Pi', 'Ei', 'Zi', 'Yi')
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si_prefixes = 'kMGTPEZY'
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big_prefixes = 'KMGTPEZY'
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def prettysize(num, base=1024, prefixes=si_prefixes, unit='B', sep=' '):
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    '''Convert data size in bytes to human readable aproximation.
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    Beware that default output is invalid by recent standardization.
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    Still, this form was in use for ages.
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    For standardized output, see prettysize_si and prettysize_iec.
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    '''
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    prefixes = list(prefixes)
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    prefix = ''
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    num = float(num)
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    while True:
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        if num < base:
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            # format number
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            out = '{:.2f}'.format(num)
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            # cut off trailing zeros
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            out = out.rstrip('0')
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            if out.endswith('.'):
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                out = out[:-1]
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            return out + sep + prefix + unit
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        num /= base
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        prefix = prefixes.pop(0)
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    raise OverflowError('Number is too large.')
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def prettysize_si(num, **kw):
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    return prettysize(num, base=1000, **kw)
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def prettysize_short(num):
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    return prettysize(num, unit='', sep='', prefixes=big_prefixes)
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def prettysize_iec(num):
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    return prettysize(num, prefixes=iec_prefixes)
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