[Python-checkins] r74380 - in python/branches/release31-maint: Doc/tutorial/floatingpoint.rst Lib/base64.py Objects/rangeobject.c

Thu Aug 13 10:47:18 CEST 2009

Author: georg.brandl
Date: Thu Aug 13 10:47:18 2009
New Revision: 74380
Log:
Merged revisions 73656,73658,73663,73666 via svnmerge from 
svn+ssh://svn.python.org/python/branches/py3k
........
 r73656 | mark.dickinson | 2009年06月29日 00:08:40 +0200 (Mo, 29 Jun 2009) | 1 line
 
 Fix description of range_length_obj
........
 r73658 | raymond.hettinger | 2009年06月29日 00:30:13 +0200 (Mo, 29 Jun 2009) | 1 line
 
 Small doc fix-ups to floatingpoint.rst. More are forthcoming.
........
 r73663 | raymond.hettinger | 2009年06月29日 01:21:38 +0200 (Mo, 29 Jun 2009) | 1 line
 
 Clean-up floating point tutorial.
........
 r73666 | alexandre.vassalotti | 2009年06月29日 03:13:41 +0200 (Mo, 29 Jun 2009) | 2 lines
 
 Make b64encode raises properly a TypeError when altchars is not bytes.
........
Modified:
 python/branches/release31-maint/ (props changed)
 python/branches/release31-maint/Doc/tutorial/floatingpoint.rst
 python/branches/release31-maint/Lib/base64.py
 python/branches/release31-maint/Objects/rangeobject.c
Modified: python/branches/release31-maint/Doc/tutorial/floatingpoint.rst
==============================================================================

--- python/branches/release31-maint/Doc/tutorial/floatingpoint.rst	(original)
+++ python/branches/release31-maint/Doc/tutorial/floatingpoint.rst	Thu Aug 13 10:47:18 2009
@@ -82,7 +82,7 @@
 while still preserving the invariant ``eval(repr(x)) == x``.
 
 Historically, the Python prompt and built-in :func:`repr` function would chose
-the one with 17 significant digits, ``0.10000000000000001``, Starting with
+the one with 17 significant digits, ``0.10000000000000001``. Starting with
 Python 3.1, Python (on most systems) is now able to choose the shortest of
 these and simply display ``0.1``.
 
@@ -123,9 +123,9 @@
 
 Though the numbers cannot be made closer to their intended exact values,
 the :func:`round` function can be useful for post-rounding so that results
-have inexact values that are comparable to one another::
+with inexact values become comparable to one another::
 
- >>> round(.1 + .1 + .1, 1) == round(.3, 1)
+ >>> round(.1 + .1 + .1, 10) == round(.3, 10)
 True
 
 Binary floating-point arithmetic holds many surprises like this. The problem
@@ -137,7 +137,7 @@
 wary of floating-point! The errors in Python float operations are inherited
 from the floating-point hardware, and on most machines are on the order of no
 more than 1 part in 2\*\*53 per operation. That's more than adequate for most
-tasks, but you do need to keep in mind that it's not decimal arithmetic, and
+tasks, but you do need to keep in mind that it's not decimal arithmetic and
 that every float operation can suffer a new rounding error.
 
 While pathological cases do exist, for most casual use of floating-point
@@ -165,7 +165,7 @@
 
 >>> x = 3.14159
 >>> x.as_integer_ratio()
- (3537115888337719L, 1125899906842624L)
+ (3537115888337719, 1125899906842624)
 
 Since the ratio is exact, it can be used to losslessly recreate the
 original value::
Modified: python/branches/release31-maint/Lib/base64.py
==============================================================================
--- python/branches/release31-maint/Lib/base64.py	(original)
+++ python/branches/release31-maint/Lib/base64.py	Thu Aug 13 10:47:18 2009
@@ -58,8 +58,8 @@
 encoded = binascii.b2a_base64(s)[:-1]
 if altchars is not None:
 if not isinstance(altchars, bytes_types):
- altchars = TypeError("expected bytes, not %s"
- % altchars.__class__.__name__)
+ raise TypeError("expected bytes, not %s"
+ % altchars.__class__.__name__)
 assert len(altchars) == 2, repr(altchars)
 return _translate(encoded, {'+': altchars[0:1], '/': altchars[1:2]})
 return encoded
Modified: python/branches/release31-maint/Objects/rangeobject.c
==============================================================================
--- python/branches/release31-maint/Objects/rangeobject.c	(original)
+++ python/branches/release31-maint/Objects/rangeobject.c	Thu Aug 13 10:47:18 2009
@@ -126,10 +126,9 @@
 PyObject_Del(r);
 }
 
-/* Return number of items in range (lo, hi, step), when arguments are PyLong
- * objects. Return a value < 0 if & only if the true value is too large to
- * fit in a signed long. Arguments MUST return 1 with PyLong_Check(). Return
- * -1 when there is an error.
+/* Return number of items in range (lo, hi, step) as a PyLong object,
+ * when arguments are PyLong objects. Arguments MUST return 1 with
+ * PyLong_Check(). Return NULL when there is an error.
 */
 static PyObject*
 range_length_obj(rangeobject *r)
