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Created on 2015-03-10 14:26 by pushpendre rastogi, last changed 2022-04-11 14:58 by admin. This issue is now closed.
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| msg237769 - (view) | Author: pushpendre rastogi (pushpendre rastogi) | Date: 2015-03-10 14:26 | |
Hi, The string formatting module in python 2.7 incorrectly formats floating point values. The following code shows the problem >>> print "%.10s"%(-7.7176718e-05) -7.7176718 >> print "%.10s"%(-0.0000771767) -7.71767e- Ideally the code should have thrown an exception (first preference) or it should have printed -0.0000771767 (second preference) or -7.7176718e-05 (third preference) |
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| msg237772 - (view) | Author: Eric V. Smith (eric.smith) *  |
Date: 2015-03-10 15:01 | |
By using %s, you're asking the formatting code to first convert the parameter to a string. Then, by using .10, you're asking it to truncate the value. It's essentially equivalent to: >>> str(-7.7176718e-05) '-7.7176718e-05' >>> str(-7.7176718e-05)[:10] '-7.7176718' and: >>> str(-0.0000771767) '-7.71767e-05' >>> str(-0.0000771767)[:10] '-7.71767e-' This isn't a bug. If you want more control over the formatting, use %f, %e, or %g: >>> '%.10f' % -7.7176718e-05 '-0.0000771767' |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:58:13 | admin | set | github: 67815 |
| 2015-03-10 15:01:09 | eric.smith | set | status: open -> closed nosy: + eric.smith messages: + msg237772 resolution: not a bug stage: resolved |
| 2015-03-10 14:26:26 | pushpendre rastogi | create | |