PEP 238 (revised)
tjenkins at nospiced.ham.devis.com
Thu Jul 26 21:51:36 EDT 2001
Guido van Rossum wrote:
> PEP: 238
> Title: Non-integer Division
> Version: $Revision: 1.10 $
> Author: pep at zadka.site.co.il (Moshe Zadka), guido at python.org (Guido van Rossum)
> Command Line Option
> The -D command line option takes a string argument that can take
> three values: "old", "warn", or "new". The default is "old" in
> Python 2.2 but will change to "warn" in later 2.x versions. The
> "old" value means the classic division operator acts as described.
> The "warn" value means the classic division operator issues a
> warning (a DeprecatinWarning using the standard warning framework)
> when applied to ints or longs. The "new" value changes the
> default globally so that the / operator is always interpreted as
> true division. The "new" option is only intended for use in
> certain educational environments, where true division is required,
> but asking the students to include the future division statement
> in all their code would be a problem.
I'm wondering if these command line options are too "generic" and not
explicit enough. Possibly
give more information as to what the options mean?
> Semantics of Floor Division
> Floor division will be implemented in all the Python numeric
> types, and will have the semantics of
> a // b == floor(a/b)
> except that the type of a//b will be the type a and b will be
> coerced into. Specifically, if a and b are of the same type, a//b
> will be of that type too.
I'm not sure I understand this part. Could you throw in an example?
Does it mean that if 'a' and 'b' are floats then a//b would return a
float? For example 3.5//2.0 == 1.0?
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