Issue #7117 (backport py3k float repr) continued:
Add sys.float_repr_style attribute ('short' if short float
repr is in used; 'legacy' otherwise).
diff --git a/Doc/library/sys.rst b/Doc/library/sys.rst
index 8264a39..5a04f39 100644
--- a/Doc/library/sys.rst
+++ b/Doc/library/sys.rst
@@ -332,6 +332,18 @@
.. versionadded:: 2.6
+.. data:: float_repr_style
+
+ A string indicating how the :func:`repr` function behaves for
+ floats. If the string has value ``'short'`` then for a finite
+ float ``x``, ``repr(x)`` aims to produce a short string with the
+ property that ``float(repr(x)) == x``. This is the usual behaviour
+ in Python 2.7 and later. Otherwise, ``float_repr_style`` has value
+ ``'legacy'`` and ``repr(x)`` behaves in the same way as it did in
+ versions of Python prior to 2.7.
+
+ .. versionadded:: 2.7
+
.. function:: getcheckinterval()
diff --git a/Lib/test/test_sys.py b/Lib/test/test_sys.py
index 0e364af..1d0e2ef 100644
--- a/Lib/test/test_sys.py
+++ b/Lib/test/test_sys.py
@@ -369,6 +369,8 @@
self.assertEqual(vi[3], vi.releaselevel)
self.assertEqual(vi[4], vi.serial)
self.assertTrue(vi > (1,0,0))
+ self.assertIsInstance(sys.float_repr_style, str)
+ self.assertTrue(sys.float_repr_style in ('short', 'legacy'))
def test_43581(self):
# Can't use sys.stdout, as this is a cStringIO object when
diff --git a/Python/sysmodule.c b/Python/sysmodule.c
index 86e0feb..c9bc4a3 100644
--- a/Python/sysmodule.c
+++ b/Python/sysmodule.c
@@ -1056,6 +1056,7 @@
executable -- pathname of this Python interpreter\n\
prefix -- prefix used to find the Python library\n\
exec_prefix -- prefix used to find the machine-specific Python library\n\
+float_repr_style -- string indicating the style of repr() output for floats\n\
"
)
#ifdef MS_WINDOWS
@@ -1498,6 +1499,15 @@
FlagsType.tp_init = NULL;
FlagsType.tp_new = NULL;
+ /* float repr style: 0.03 (short) vs 0.029999999999999999 (legacy) */
+#ifndef PY_NO_SHORT_FLOAT_REPR
+ SET_SYS_FROM_STRING("float_repr_style",
+ PyString_FromString("short"));
+#else
+ SET_SYS_FROM_STRING("float_repr_style",
+ PyString_FromString("legacy"));
+#endif
+
#undef SET_SYS_FROM_STRING
if (PyErr_Occurred())
return NULL;