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update from Mike Meyer

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David Goodger 2003-04-04 21:19:59 +00:00
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pep-0313.txt
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@ -13,10 +13,11 @@ Post-History:
Abstract Abstract
This PEP proposes adding Roman numerals as a literal type. It This PEP (also known as PEP CCCXIII) proposes adding Roman
also proposes the new built-in function "roman", which converts an numerals as a literal type. It also proposes the new built-in
object to an integer, then converts the integer to a string that function "roman", which converts an object to an integer, then
is the Roman numeral literal equivalent to the integer. converts the integer to a string that is the Roman numeral literal
equivalent to the integer.
Rationale Rationale
@ -38,12 +39,13 @@ Syntax for Roman literals
case, and represent an integer with the following rules: case, and represent an integer with the following rules:
1. Except as noted below, they must appear in the order M, D, C, 1. Except as noted below, they must appear in the order M, D, C,
L, X, V then I. Each occurence of each character adds 1000, 500, L, X, V then I. Each occurrence of each character adds 1000, 500,
100, 50, 10, 5 and 1 to the value of the literal, respectively. 100, 50, 10, 5 and 1 to the value of the literal, respectively.
2. Only one D, V or L may appear in any given literal. 2. Only one D, V or L may appear in any given literal.
3. At most three Is, Xs and Cs may appear in any given literal. 3. At most three each of Is, Xs and Cs may appear consecutively
in any given literal.
4. A single I may appear immediately to the left of the single V, 4. A single I may appear immediately to the left of the single V,
followed by no Is, and adds 4 to the value of the literal. followed by no Is, and adds 4 to the value of the literal.
@ -62,21 +64,21 @@ Syntax for Roman literals
because explicit is better than implicit. because explicit is better than implicit.
Builtin "roman" Function Built-In "roman" Function
The new builtin function "roman" will aide the translation from The new built-in function "roman" will aide the translation from
integers to Roman numeral literals. It will accept a single integers to Roman numeral literals. It will accept a single
object as an argument, and return a string containing the literal object as an argument, and return a string containing the literal
of the same value. If the argument is not an integer or a of the same value. If the argument is not an integer or a
rational (see PEP 239 [1]) it will passed through the existing rational (see PEP 239 [1]) it will passed through the existing
builtin "int" to obtain the value. This may cause a loss of built-in "int" to obtain the value. This may cause a loss of
information if the object was a float. If the object is a information if the object was a float. If the object is a
rational, then the result will be formatted as a rational literal rational, then the result will be formatted as a rational literal
(see PEP 240 [2]) with the integers in the string being Roman (see PEP 240 [2]) with the integers in the string being Roman
numeral literals. numeral literals.
Compatability Issues Compatibility Issues
No new keywords are introduced by this proposal. Programs that No new keywords are introduced by this proposal. Programs that
use variable names that are all upper case and contain only the use variable names that are all upper case and contain only the