bpo-39416: Document some restrictions on the default string representations of numeri...

[bpo-39416](): Document string representations of the Numeric classes

This is a change to the specification of the Python language.

The idea here is to put sane minimal limits on the Python language's default
representations of its Numeric classes.  That way "Marty's Robotic Massage Parlor
and Python Interpreter" implementation of Python won't do anything too
crazy.

Some discussion in the email thread:
Subject: Documenting Python's float.__str__()
https://mail.python.org/archives/list/python-dev@python.org/thread/FV22TKT3S2Q3P7PNN6MCXI6IX3HRRNAL/

diff --git a/Doc/reference/datamodel.rst b/Doc/reference/datamodel.rst
index 29e64cba2ca3ae076922e0b9c7ee3e42edc932be..d9b72a9a942ed8c2988e9ae591bc822a1fd91947 100644 (file)
--- a/Doc/reference/datamodel.rst
+++ b/Doc/reference/datamodel.rst
@@ -187,6 +187,24 @@ Ellipsis
    related to mathematical numbers, but subject to the limitations of numerical
    representation in computers.
 
+   The string representations of the Numeric classes, computed by
+   :meth:`__repr__` and :meth:`__str__`, have the following
+   properties:
+
+   * They are valid numeric literals which, when passed to their
+     class constructor, produce an object having the value of the
+     original numeric.
+
+   * The representation is in base 10, when possible.
+
+   * Leading zeros, possibly excepting a single zero before a
+     decimal point, are not shown.
+
+   * Trailing zeros, possibly excepting a single zero after a
+     decimal point, are not shown.
+
+   * A sign is shown only when the number is negative.
+
    Python distinguishes between integers, floating point numbers, and complex
    numbers:
 

diff --git a/Misc/NEWS.d/next/Documentation/2020-01-22-05-14-53.bpo-39416.uYjhEm.rst b/Misc/NEWS.d/next/Documentation/2020-01-22-05-14-53.bpo-39416.uYjhEm.rst
new file mode 100644 (file)
index 0000000..279a5f1
--- /dev/null
+++ b/Misc/NEWS.d/next/Documentation/2020-01-22-05-14-53.bpo-39416.uYjhEm.rst
@@ -0,0 +1 @@
+Document some restrictions on the default string representations of numeric classes.