topic Re: Scientific Notation to Double in Python Questions

Scientific Notation to Double

WilliamIde — Thu, 26 Jan 2012 14:40:35 GMT

Does anyone know of an elegant way to convert a string that has a number represented by scientific notation ( e.g. .0340344E-4) to a double? I and trying to normalize a set of shape files from different sources and one of my providers gave me a length field in sci notation. All the others are doubles. or strings as doubles. (e.g. "23.5") I can handle the second case. Not sure how to do the first without resorting to "brute force" parsing.

Thanks

Re: Scientific Notation to Double

BruceNielsen — Sat, 11 Dec 2021 16:39:25 GMT

You could use string substitution techniques:

 print '%13.11f' % float('.0340344E-4')
'0.00000340344'

Re: Scientific Notation to Double

GerryGabrisch — Sat, 11 Dec 2021 16:39:27 GMT

def SciNoteToFloat(x):
    '''Takes a string writen in scientific notation and
    returns a float'''
    x = x.lower()
    x = x.partition("e")
    return (float(x[0])) * (int("1" + "0" * (-1 * int(x[2]))))
mynum = "0.223E-7"
print SciNoteToFloat(mynum)