[issue1168] complex arithmetic: strange results with "imag"

[Nusret BALCI]

New submission from Nusret BALCI:

"imag" returns incorrect results if invoked on a literal number.
Looks like a bug.

>>> 1-2j
(1-2j)
>>> 1-2j.real
1.0
>>> 1-2j.imag
-1.0
>>> 1-4j.imag
-3.0
>>> (1-4j).imag
-4.0
>>>

--
messages: 55940
nosy: newman
severity: normal
status: open
title: complex arithmetic: strange results with "imag"
type: behavior
versions: Python 2.5, Python 3.0

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[issue1168] complex arithmetic: strange results with "imag"

[Gabriel Genellina]

Gabriel Genellina added the comment:

Note that there are no complex literals in Python, only imaginary 
literals. 1-4j is an expression, not a literal.
So 1-4j.imag means 1-(4j.imag) = 1-4 = -3
See http://docs.python.org/ref/numbers.html#l2h-16

(I'd close this as not a bug)

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[issue1168] complex arithmetic: strange results with "imag"

[Georg Brandl]

Georg Brandl added the comment:

Exactly.

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nosy: +georg.brandl
resolution:  -> invalid
status: open -> closed

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[issue1134] Parsing a simple script eats all of your memory

[Alexey Suda-Chen]

Alexey Suda-Chen added the comment:

Oops, i see there are two bugs. Previously i have fixed multiline
strings only.

I think it will be:

Index: tokenizer.c
===
--- tokenizer.c (revision 58161)
+++ tokenizer.c (working copy)
@@ -395,6 +395,7 @@
goto error;
buflen = size;
}
+
memcpy(s, buf, buflen);
s[buflen] = '\0';
if (buflen == 0) /* EOF */
@@ -402,6 +403,12 @@
if (allocated) {
Py_DECREF(bufobj);
}
+
+  if ( bufobj == tok->decoding_buffer ){
+Py_XDECREF(tok->decoding_buffer);
+tok->decoding_buffer = 0;
+  }
+
return s;
 
 error:

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[issue1167] gdbm/ndbm 1.8.1+ needs libgdbm_compat.so

[Martin v. Löwis]

Changes by Martin v. Löwis:


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keywords: +patch

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[issue1146] TextWrap vs words 1-character shorter than the width

[Martin v. Löwis]

Changes by Martin v. Löwis:


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keywords: +patch

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[issue1727780] 64/32-bit issue when unpickling random.Random

[Martin v. Löwis]

Martin v. Löwis added the comment:

Would anybody of you like to work on a patch?

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[issue1169] Option -OO doesn't remove docstrings from functions

[Daniele Varrazzo]

New submission from Daniele Varrazzo:

The issue was already addressed in Issue1722485.

The fix applied in rev. 55732, 55733 only fixes module and class
docstrings, not function docstrings.

The attached patch fixed the issue for function docstrings too.

--
components: None
files: fix_function_docstring.patch
messages: 55945
nosy: piro
severity: normal
status: open
title: Option -OO doesn't remove docstrings from functions
type: compile error
versions: Python 2.5

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__--- compile.c.bak	2007-09-16 17:23:43.0 +0200
+++ compile.c	2007-09-16 17:26:38.0 +0200
@@ -1336,7 +1336,7 @@
 
 	st = (stmt_ty)asdl_seq_GET(s->v.FunctionDef.body, 0);
 	docstring = compiler_isdocstring(st);
-	if (docstring)
+	if (docstring && Py_OptimizeFlag < 2)
 	first_const = st->v.Expr.value->v.Str.s;
 	if (compiler_add_o(c, c->u->u_consts, first_const) < 0)	 {
 	compiler_exit_scope(c);
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[issue1169] Option -OO doesn't remove docstrings from functions

[Daniele Varrazzo]

Daniele Varrazzo added the comment:

The attached file shows the issue: running with -OO no docstring should
be printed.

In rev 58163 the functions docstrings are still printed.

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__"""Module docstring"""

class Test:
"""Class docstring"""
def test(self):
"""Method docstring."""
pass

def fun():
"""Function docstring."""
pass

print 'module', __doc__
print 'class', Test.__doc__
print 'method', Test.test.__doc__
print 'fun', fun.__doc__
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[issue1165] Should itertools.count work for arbitrary integers?

[Eduardo Padoan]

Changes by Eduardo Padoan:


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[issue1169] Option -OO doesn't remove docstrings from functions

[Martin v. Löwis]

Changes by Martin v. Löwis:


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[issue1165] Should itertools.count work for arbitrary integers?

[Raymond Hettinger]

Changes by Raymond Hettinger:


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[issue1158] %f format for datetime objects

[Skip Montanaro]

Changes by Skip Montanaro:


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[issue1158] %f format for datetime objects

[Skip Montanaro]

Skip Montanaro added the comment:

Here are new patches for 2.6 and 3.0 including changes
to doc and test cases.

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__Index: Lib/test/test_datetime.py
===
--- Lib/test/test_datetime.py	(revision 58174)
+++ Lib/test/test_datetime.py	(working copy)
@@ -1488,9 +1488,9 @@
 
 def test_more_strftime(self):
 # This tests fields beyond those tested by the TestDate.test_strftime.
-t = self.theclass(2004, 12, 31, 6, 22, 33)
-self.assertEqual(t.strftime("%m %d %y %S %M %H %j"),
-"12 31 04 33 22 06 366")
+t = self.theclass(2004, 12, 31, 6, 22, 33, 47)
+self.assertEqual(t.strftime("%m %d %y %f %S %M %H %j"),
+"12 31 04 47 33 22 06 366")
 
 def test_extract(self):
 dt = self.theclass(2002, 3, 4, 18, 45, 3, 1234)
@@ -1763,7 +1763,7 @@
 
 def test_strftime(self):
 t = self.theclass(1, 2, 3, 4)
-self.assertEqual(t.strftime('%H %M %S'), "01 02 03")
+self.assertEqual(t.strftime('%H %M %S %f'), "01 02 03 04")
 # A naive object replaces %z and %Z with empty strings.
 self.assertEqual(t.strftime("'%z' '%Z'"), "'' ''")
 
Index: Modules/datetimemodule.c
===
--- Modules/datetimemodule.c	(revision 58174)
+++ Modules/datetimemodule.c	(working copy)
@@ -1130,10 +1130,24 @@
 	return 0;
 }
 
+static PyObject *
+make_freplacement(PyObject *object)
+{
+	char freplacement[7];
+	if (PyTime_Check(object))
+	sprintf(freplacement, "%06d", TIME_GET_MICROSECOND(object));
+	else if (PyDateTime_Check(object))
+	sprintf(freplacement, "%06d", DATE_GET_MICROSECOND(object));
+	else
+	sprintf(freplacement, "%06d", 0);
+
+	return PyString_FromStringAndSize(freplacement, strlen(freplacement));
+}
+
 /* I sure don't want to reproduce the strftime code from the time module,
  * so this imports the module and calls it.  All the hair is due to
- * giving special meanings to the %z and %Z format codes via a preprocessing
- * step on the format string.
+ * giving special meanings to the %z, %Z and %f format codes via a
+ * preprocessing step on the format string.
  * tzinfoarg is the argument to pass to the object's tzinfo method, if
  * needed.
  */
@@ -1145,6 +1159,7 @@
 
 	PyObject *zreplacement = NULL;	/* py string, replacement for %z */
 	PyObject *Zreplacement = NULL;	/* py string, replacement for %Z */
+	PyObject *freplacement = NULL;	/* py string, replacement for %f */
 
 	char *pin;	/* pointer to next char in input format */
 	char ch;	/* next char in input format */
@@ -1186,11 +1201,11 @@
 		}
 	}
 
-	/* Scan the input format, looking for %z and %Z escapes, building
+	/* Scan the input format, looking for %z/%Z/%f escapes, building
 	 * a new format.  Since computing the replacements for those codes
 	 * is expensive, don't unless they're actually used.
 	 */
-	totalnew = PyString_Size(format) + 1;	/* realistic if no %z/%Z */
+	totalnew = PyString_Size(format) + 1;	/* realistic if no %z/%Z/%f */
 	newfmt = PyString_FromStringAndSize(NULL, totalnew);
 	if (newfmt == NULL) goto Done;
 	pnew = PyString_AsString(newfmt);
@@ -1272,6 +1287,18 @@
 			ptoappend = PyString_AS_STRING(Zreplacement);
 			ntoappend = PyString_GET_SIZE(Zreplacement);
 		}
+		else if (ch == 'f') {
+			/* format microseconds */
+			if (freplacement == NULL) {
+freplacement = make_freplacement(object);
+if (freplacement == NULL)
+	goto Done;
+			}
+			assert(freplacement != NULL);
+			assert(PyString_Check(freplacement));
+			ptoappend = PyString_AS_STRING(freplacement);
+			ntoappend = PyString_GET_SIZE(freplacement);
+		}
 		else {
 			/* percent followed by neither z nor Z */
 			ptoappend = pin - 2;
@@ -1313,6 +1340,7 @@
 		Py_DECREF(time);
 	}
  Done:
+	Py_XDECREF(freplacement);
 	Py_XDECREF(zreplacement);
 	Py_XDECREF(Zreplacement);
 	Py_XDECREF(newfmt);
Index: Doc/library/datetime.rst
===
--- Doc/library/datetime.rst	(revision 58174)
+++ Doc/library/datetime.rst	(working copy)
@@ -1297,10 +1297,16 @@
 be used, as time objects have no such values.  If they're used anyway, ``1900``
 is substituted for the year, and ``0`` for the month and day.
 
-For :class:`date` objects, the format codes for hours, minutes, and seconds
-should not be used, as :class:`date` objects have no such values.  If they're
-used anyway, ``0`` is substituted for them.
+For :class:`date` objects, the format codes for hours, minutes, seconds, and
+fractions of sections should not be used, as :class:`date` objects have no
+such values.  If they're used anyway, ``0`` is substituted for them.
 
+:class:`time` and :class:`datetime` objects support a ``%f`` format code
+which expands to the

[issue1158] %f format for datetime objects

[Skip Montanaro]

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[issue1164] tp_print slots don't release the GIL

[Guido van Rossum]

Guido van Rossum added the comment:

looks good to me :)

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[issue1164] tp_print slots don't release the GIL

[Brett Cannon]

Brett Cannon added the comment:

Applied in r58176.  And I am glad this is not an issue in Py3K.  =)

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status: open -> closed

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[issue1597011] Reading with bz2.BZ2File() returns one garbage character

[Sean Reifschneider]

Sean Reifschneider added the comment:

I have committed this into trunk and the 2.5 maintenance branch.  It
passes all tests and the resulting build passes the submitter-provided test.

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[issue1020] pydoc doesn't work on pyexpat

[Sean Reifschneider]

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[issue1021] logging.basicConfig does not allow to set NOTSET level

[Sean Reifschneider]

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[issue1025] tracebacks from list comps (probably other comps) don't show full stack

[Sean Reifschneider]

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[issue1042] test_glob fails with UnicodeDecodeError

[Sean Reifschneider]

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[issue1053] bogus attributes reported in asyncore doc

[Sean Reifschneider]

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[issue1053] bogus attributes reported in asyncore doc

[Sean Reifschneider]

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[issue1060] zipfile cannot handle files larger than 2GB (inside archive)

[Sean Reifschneider]

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[issue1003] zipfile password fails validation

[Sean Reifschneider]

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[issue1067] test_smtplib failures (caused by asyncore)

[Sean Reifschneider]

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[issue1079] decode_header does not follow RFC 2047

[Sean Reifschneider]

Sean Reifschneider added the comment:

Can you provide an example of an address that triggers this?  Preferably
in a code sample that can be used to reproduce it?  Uber-ideally, a
patch to the email module test suite would be great.

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[issue1597011] Reading with bz2.BZ2File() returns one garbage character

[Sean Reifschneider]

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[issue1081] file.seek allows float arguments

[Sean Reifschneider]

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