Message86283
When the Fractions module was first added to Python, it was decided that
when constructing from a string, decimal strings should be allowed, but
not those including an exponent. For example, Fraction('1.1') is
currently valid, but Fraction('1.1e6') is not.
I think exponents should be permitted, for a couple of reasons:
(1) consistency: there's a clearly-defined notion of a numeric string
of the form ([sign] integer_part [fractional_part] [exponent]); the
float and Decimal constructors both accept all numeric strings.
Fraction currently accepts some, but not all of these.
(2) Easy interactions with floats: with this addition, a Fraction can
always be constructed from the str() or repr() of a finite float or
finite Decimal; without it, only some of those strings can be converted.
(3) Ease of parsing files containing numeric strings.
(4) It's a very simple change! See attached patch.
Jeffrey, any thoughts? |
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Date |
User |
Action |
Args |
2009-04-22 10:04:27 | mark.dickinson | set | recipients:
+ mark.dickinson, jyasskin |
2009-04-22 10:04:27 | mark.dickinson | set | messageid: <1240394667.14.0.711650033948.issue5812@psf.upfronthosting.co.za> |
2009-04-22 10:04:24 | mark.dickinson | link | issue5812 messages |
2009-04-22 10:04:23 | mark.dickinson | create | |
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