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| ---- {{{ #!/usr/bin/env python r""" bsce.py Show that the Python decimal module understands computer engineering notation, in contrast with the Python math module that understands scientific notation. Thus help Python newbies unfamiliar with __future__, with, decimal 0 +, etc. >>> est(0) '0' >>> est(100) '100' >>> est(12300) '12.3e+3' >>> est(12345) '~12.3e+3' >>> est(987654321) '~988e+6' >>> est(987654321, 6) '~987.654e+6' >>> est(2 ** 40) '~1.10e+12' >>> >>> estsci(12300) '1.23e+4' >>> estsci(987654321) '~9.88e+8' >>> estsci(987654321, 6) '~9.87654e+8' >>> See also: http://www.google.com/search?q=python+notation+engineering+scientific See also: http://www.etsimo.uniovi.es/python/pycon/2005/papers/24/ See also: http://docs.python.org/lib/module-decimal.html """ from __future__ import with_statement import decimal import math def est(count, prec = 3): """ Return the count or an approximately equal value in engr. notation. """ with decimal.localcontext(decimal.Context(prec = prec)): eng = (0 + decimal.Decimal(count)).to_eng_string().lower() est = eng if count == int(float(eng)) else '~' + eng return est def estsci(count, prec = 3): """ Return the count or an approximately equal value in sci. notation. """ exp = int(math.log(count, 10)) sci = ('%.' + str(prec - 1) + 'fe+%d') % (count / (10.0 ** exp), exp) est = sci if count == int(float(sci)) else '~' + sci return est if __name__ == '__main__': import doctest (failings, testings) = doctest.testmod(optionflags = doctest.ELLIPSIS) }}} ---- CategoryFaq |
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I'm a 43 years old, married and work at the college (Industrial and Labor Relations).
In my free time I'm trying to teach myself French. I've been twicethere and look forward to go there sometime near future. I love to read, preferably on my ipad. I like to watch Game of Thrones and Family Guy as well as docus about nature. I love American football.
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