It creates a modified copy of an object by calling the object's
__replace__() method.
It is a generalization of dataclasses.replace(), named tuple's _replace()
method and replace() methods in various classes, and supports all these
stdlib classes.
copy.copy() and copy.deepcopy() now always raise a TypeError if
__reduce__() returns a tuple with length 6 instead of silently ignore
the 6th item or produce incorrect result.
Previously, the result could have been an instance of a subclass of int.
Also revert bpo-26202 and make attributes start, stop and step of the range
object having exact type int.
Add private function _PyNumber_Index() which preserves the old behavior
of PyNumber_Index() for performance to use it in the conversion functions
like PyLong_AsLong().
Copying property objects results in a TypeError. Steps to reproduce:
```
>>> import copy
>>> obj = property()
>>> copy.copy(obj)
````
This affects both shallow and deep copying.
My idea for a fix is to add property objects to the list of "atomic" objects in the copy module.
These already include types like functions and type objects.
I also added property objects to the unit tests test_copy_atomic and test_deepcopy_atomic. This is my first PR, and it's highly likely I've made some mistake, so please be kind :)
https://bugs.python.org/issue38293
I have compared output between pre- and post-patch runs of these tests
to make sure there's nothing missing and nothing broken, on both
Windows and Linux. The only differences I found were actually tests
that were previously *not* run.
Updated documentation.
Merged revisions 63042 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk
........
r63042 | alexandre.vassalotti | 2008-05-11 04:25:28 -0400 (Sun, 11 May 2008) | 5 lines
Added module stub for copy_reg renaming in 3.0.
Renamed copy_reg to copyreg in the standard library, to avoid
spurious warnings and ease later merging to py3k branch. Public
documentation remains intact.
........
svn+ssh://pythondev@svn.python.org/python/trunk
........
r60990 | eric.smith | 2008-02-23 17:05:26 +0100 (Sat, 23 Feb 2008) | 1 line
Removed duplicate Py_CHARMASK define. It's already defined in Python.h.
........
r60991 | andrew.kuchling | 2008-02-23 17:23:05 +0100 (Sat, 23 Feb 2008) | 4 lines
#1330538: Improve comparison of xmlrpclib.DateTime and datetime instances.
Remove automatic handling of datetime.date and datetime.time.
This breaks backward compatibility, but python-dev discussion was strongly
against this automatic conversion; see the bug for a link.
........
r60994 | andrew.kuchling | 2008-02-23 17:39:43 +0100 (Sat, 23 Feb 2008) | 1 line
#835521: Add index entries for various pickle-protocol methods and attributes
........
r60995 | andrew.kuchling | 2008-02-23 18:10:46 +0100 (Sat, 23 Feb 2008) | 2 lines
#1433694: minidom's .normalize() failed to set .nextSibling for last element.
Fix by Malte Helmert
........
r61000 | christian.heimes | 2008-02-23 18:40:11 +0100 (Sat, 23 Feb 2008) | 1 line
Patch #2167 from calvin: Remove unused imports
........
r61001 | christian.heimes | 2008-02-23 18:42:31 +0100 (Sat, 23 Feb 2008) | 1 line
Patch #1957: syslogmodule: Release GIL when calling syslog(3)
........
r61002 | christian.heimes | 2008-02-23 18:52:07 +0100 (Sat, 23 Feb 2008) | 2 lines
Issue #2051 and patch from Alexander Belopolsky:
Permission for pyc and pyo files are inherited from the py file.
........
svn+ssh://pythondev@svn.python.org/python/branches/p3yk
........
r55077 | guido.van.rossum | 2007-05-02 11:54:37 -0700 (Wed, 02 May 2007) | 2 lines
Use the new print syntax, at least.
........
r55142 | fred.drake | 2007-05-04 21:27:30 -0700 (Fri, 04 May 2007) | 1 line
remove old cruftiness
........
r55143 | fred.drake | 2007-05-04 21:52:16 -0700 (Fri, 04 May 2007) | 1 line
make this work with the new Python
........
r55162 | neal.norwitz | 2007-05-06 22:29:18 -0700 (Sun, 06 May 2007) | 1 line
Get asdl code gen working with Python 2.3. Should continue to work with 3.0
........
r55164 | neal.norwitz | 2007-05-07 00:00:38 -0700 (Mon, 07 May 2007) | 1 line
Verify checkins to p3yk (sic) branch go to 3000 list.
........
r55166 | neal.norwitz | 2007-05-07 00:12:35 -0700 (Mon, 07 May 2007) | 1 line
Fix this test so it runs again by importing warnings_test properly.
........
r55167 | neal.norwitz | 2007-05-07 01:03:22 -0700 (Mon, 07 May 2007) | 8 lines
So long xrange. range() now supports values that are outside
-sys.maxint to sys.maxint. floats raise a TypeError.
This has been sitting for a long time. It probably has some problems and
needs cleanup. Objects/rangeobject.c now uses 4-space indents since
it is almost completely new.
........
r55171 | guido.van.rossum | 2007-05-07 10:21:26 -0700 (Mon, 07 May 2007) | 4 lines
Fix two tests that were previously depending on significant spaces
at the end of a line (and before that on Python 2.x print behavior
that has no exact equivalent in 3.0).
........
The compiler package hasn't been updated yet; test_compiler.py fails.
Otherwise all tests seem to be passing now. There are no occurrences
of __metaclass__ left in the standard library.
Docs have not been updated.
and .keys(), .items(), .values() return dict views.
The dict views aren't fully functional yet; in particular, they can't
be compared to sets yet. but they are useful as "iterator wells".
There are still 27 failing unit tests; I expect that many of these
have fairly trivial fixes, but there are so many, I could use help.
*ordering* between objects; there is only a default equality test
(defined by an object being equal to itself only). Read the comment
in object.c. The current implementation never uses a three-way
comparison to compute a rich comparison, but it does use a rich
comparison to compute a three-way comparison. I'm not quite done
ripping out all the calls to PyObject_Compare/Cmp, or replacing
tp_compare implementations with tp_richcompare implementations;
but much of that has happened (to make most unit tests pass).
The following tests still fail, because I need help deciding
or understanding:
test_codeop -- depends on comparing code objects
test_datetime -- need Tim Peters' opinion
test_marshal -- depends on comparing code objects
test_mutants -- need help understanding it
The problem with test_codeop and test_marshal is this: these tests
compare two different code objects and expect them to be equal.
Is that still a feature we'd like to support? I've temporarily
removed the comparison and hash code from code objects, so they
use the default (equality by pointer only) comparison.
For the other two tests, run them to see for yourself.
(There may be more failing test with "-u all".)
A general problem with getting lots of these tests to pass is
the reality that for object types that have a natural total ordering,
implementing __cmp__ is much more convenient than implementing
__eq__, __ne__, __lt__, and so on. Should we go back to allowing
__cmp__ to provide a total ordering? Should we provide some other
way to implement rich comparison with a single method override?
Alex proposed a __key__() method; I've considered a __richcmp__()
method. Or perhaps __cmp__() just shouldn't be killed off...
- The copy module now "copies" function objects (as atomic objects).
- dict.__getitem__ now looks for a __missing__ hook before raising
KeyError.
- Added a new type, defaultdict, to the collections module.
This uses the new __missing__ hook behavior added to dict (see above).
and test_support.run_classtests() into run_unittest()
and use it wherever possible.
Also don't use "from test.test_support import ...", but
"from test import test_support" in a few spots.
From SF patch #662807.
atomically, but deepcopy() didn't support this at all.
I don't see any reason for this, so I'm adding ClassType
to the set of types that are deep-copied atomically.
Max Muoto
Serhiy Storchaka
Nikita Sobolev
Guðni Natan Gunnarsson
Yury Selivanov
Zachary Ware
Antoine Pitrou
Alexandre Vassalotti
Sandro Tosi
Benjamin Peterson
Ezio Melotti
Mark Dickinson
Christian Heimes
Collin Winter
Guido van Rossum
Neal Norwitz
Walter Dörwald
Armin Rigo
Martin v. Löwis