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Created on 2015-03-27 13:01 by MonsieurPaul, last changed 2022-04-11 14:58 by admin. This issue is now closed.
| Messages (3) | |||
|---|---|---|---|
| msg239394 - (view) | Author: Paul Eckhardt (MonsieurPaul) | Date: 2015-03-27 13:01 | |
The bahaviour of __format__ for decimal.Decimal type differs in one detail from float:
The minimum number of digits used for the exponent is 1 for Decimal, and 2 for float.
e.g.: "{:8.2E}".format(1.0) --> "1.00E+00"
"{:8.2E}".format(Decimal(1.0)) --> " 1.00E+0"
Is there any reason for this?
If not, the following patch should do:
--- /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/decimal.py 2015-03-27 12:55:22.000000000 +0100
+++ ./decimal.py 2015-03-27 14:00:09.000000000 +0100
@@ -6116,7 +6116,7 @@
if exp != 0 or spec['type'] in 'eE':
echar = {'E': 'E', 'e': 'e', 'G': 'E', 'g': 'e'}[spec['type']]
- fracpart += "{0}{1:+}".format(echar, exp)
+ fracpart += "{0}{1:+03d}".format(echar, exp)
if spec['type'] == '%':
fracpart += '%'
|
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| msg239404 - (view) | Author: Paul Moore (paul.moore) *  |
Date: 2015-03-27 14:21 | |
I believe it's the way it is because Python follows the Standard Decimal Specification, which includes tests for conformance to the current formatting behaviour. |
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| msg239430 - (view) | Author: Mark Dickinson (mark.dickinson) * |
Date: 2015-03-27 19:34 | |
> I believe it's the way it is because Python follows the Standard Decimal Specification Yes, exactly. This is behaving as designed and as tested. |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:58:14 | admin | set | github: 67977 |
| 2015-03-27 19:34:09 | mark.dickinson | set | status: open -> closed nosy: + mark.dickinson messages: + msg239430 resolution: not a bug |
| 2015-03-27 15:00:38 | r.david.murray | set | nosy:
+ skrah |
| 2015-03-27 14:21:18 | paul.moore | set | nosy:
+ paul.moore messages: + msg239404 |
| 2015-03-27 13:01:13 | MonsieurPaul | create | |