[issue7919] reading scientific notation using d instead of e on max osx
New submission from ricitron ricit...@mac.com:
I would like to be able to read in data that uses scientific notation with a D
instead of an E. This is possible on windows and other builds, but not on Mac
OSX.
example:
float('1.23D+04')
Traceback (most recent call last):
File stdin, line 1, in module
ValueError: invalid literal for float(): 1.23D+04
--
assignee: ronaldoussoren
components: Macintosh
messages: 99281
nosy: ricitron, ronaldoussoren
severity: normal
status: open
title: reading scientific notation using d instead of e on max osx
type: feature request
versions: Python 2.5
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[issue7919] reading scientific notation using d instead of e on max osx
Eric Smith e...@trueblade.com added the comment: str-float conversions have been reworked in 2.7 and 3.1. The 'D' exponent will not on any platform starting with those versions. So, this would be a non-platform specific feature request. -- assignee: ronaldoussoren - components: +Interpreter Core -Macintosh nosy: +eric.smith, mark.dickinson versions: +Python 2.7, Python 3.2 -Python 2.5 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7919 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7919] reading scientific notation using d instead of e on max osx
Eric Smith e...@trueblade.com added the comment: That was supposed to say: The 'D' exponent will not work on any platform starting with those versions. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7919 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7919] reading scientific notation using d instead of e on max osx
Mark Dickinson dicki...@gmail.com added the comment: Out of curiosity, where are your data coming from? For Python, this seems like a needless complication. It should be simple enough to replace the 'D's with 'E's prior to passing the strings to float. I notice that some varieties of Lisp and Scheme use 's', 'f', 'd', 'l' as the exponent marker for floats of different precisions (short, single, double, long double). But Python only has one precision of float. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7919 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7919] reading scientific notation using d instead of e on max osx
ricitron ricit...@mac.com added the comment: I am running python 2.5.4. While it works on linux and windows, it does not work on mac. Fortran doubles are output using the D notation. If I am importing a large amount of data, I would rather not do a search and replace every time before reading in the data. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7919 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7919] reading scientific notation using d instead of e on max osx
Mark Dickinson dicki...@gmail.com added the comment: Sorry, I'm -1 on this: outside Fortran, using 'E' for the exponent marker seems to be near universal. It just doesn't seem worth adding the extra complication to the Python code, or going through all the various places that expect an 'e' (float literals in Python source, inputs to the float function, Decimal and Fraction inputs, complex numbers, etc.) and trying to decide whether 'd' should be supported there too. Even in Fortran, isn't it normal to output floats and doubles using the 'E' format specifier? -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7919 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7919] reading scientific notation using d instead of e on max osx
Mark Dickinson dicki...@gmail.com added the comment:
I would rather not do a search and replace every time before reading in the
data.
There's no need to do a search and replace *before* reading the data: read the
data first, then have Python do the replace for you before passing each string
to float:
t = string.maketrans('d', 'e')
'-14.235d+03'.translate(t)
'-14.235e+03'
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[issue7919] reading scientific notation using d instead of e on max osx
Eric Smith e...@trueblade.com added the comment: Unless and until we implement 'd' exponents, we should add a test to make sure they don't work. That they ever worked on any platform was a surprise. -- Eric. -- title: reading scientific notation using d instead of e on max osx - reading scientific notation using d instead of e on max osx ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7919 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7919] reading scientific notation using d instead of e on max osx
Mark Dickinson dicki...@gmail.com added the comment: Done in r78166 (trunk), r78167 (py3k). -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7919 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7919] reading scientific notation using d instead of e on max osx
Eric Smith e...@trueblade.com added the comment: I'm -1 on this, too. Closing. -- resolution: - rejected stage: - committed/rejected status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7919 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
