774479c68b
Fix:
...
[ 1176893 ] Readline segfault
by unsilly-ing PyGILState_Release().
Backport candidate.
2005-04-18 08:46:17 +00:00
8ec676e9fa
Update permissions for Finn Bock.
2005-04-13 22:04:21 +00:00
3033734081
Update permissions for Eric Price.
2005-04-11 03:11:11 +00:00
95ed80b0e0
Update status for Irme de Jong.
2005-04-10 16:36:16 +00:00
ab9ec1654f
Patch #1177597 : Fix various bugs in Demo/classes/Complex.py.
2005-04-09 10:53:34 +00:00
f4189916e3
Flush out support for ``class B(): pass`` syntax by adding support to the
...
'parser' module and 'compiler' package.
Closes patch #1176012 . Thanks logistix.
2005-04-09 02:30:16 +00:00
da524a9d30
Record removal of permissions for Charles Waldman.
2005-04-08 20:43:19 +00:00
207d5ebfc4
Add ESR info.
2005-04-08 20:02:08 +00:00
efcd1d3c41
Record a drop request by Ken Manheimer.
2005-04-08 19:09:19 +00:00
1f0d103da9
Record a drop request by Moshe Zadka.
2005-04-08 18:36:14 +00:00
b53b741171
Info about Eric Price.
2005-04-08 17:16:28 +00:00
af2c70a5c7
Update permissions log for Reedy, Holden, Haring, and Cole.
2005-04-08 03:19:09 +00:00
e3afc598bc
In a threads-disabled build, typing Ctrl-C into a raw_input() crashed,
...
because (essentially) I didn't realise that PY_BEGIN/END_ALLOW_THREADS
actually expanded to nothing under a no-threads build, so if you somehow
NULLed out the threadstate (e.g. by calling PyThread_SaveThread) it would
stay NULLed when you return to Python. Argh!
Backport candidate.
2005-04-07 10:11:19 +00:00
a739b08d12
By popular demand from Linux-heads(!), renamed developers to developers.txt.
2005-04-06 00:59:02 +00:00
7dcdd8c3e8
Begin a log of developer permissions.
2005-04-05 22:35:15 +00:00
a6e8a4ad12
Since PyPI only accepts UTF-8 encoded data now, make sure that the data is
...
properly encoded and include the encoding in the Content-Type header.
2005-03-31 13:57:38 +00:00
b330adf9eb
NEWS entries for the bugs I fixed yesterday.
2005-03-31 09:35:44 +00:00
ed233460d8
Update NEWS for patch 1171735 (Darwin 8 build fixes)
2005-03-29 13:47:59 +00:00
12b6f6cac7
Move exception finalisation later in the shutdown process - this
...
fixes the crash seen in bug #1165761
2005-03-29 13:36:16 +00:00
267b868f23
* Fix decimal's handling of foreign types. Now returns NotImplemented
...
instead of raising a TypeError. Allows other types to successfully
implement __radd__() style methods.
* Remove future division import from test suite.
* Remove test suite's shadowing of __builtin__.dir().
2005-03-27 10:47:39 +00:00
55f1bb8bfa
Add the upload command. Make all dist commands register their
...
outputs with the distribution object.
2005-03-21 20:56:35 +00:00
e6c430dffe
Add comment about optional option for keeping indentation level from previous
...
line.
2005-03-21 20:41:51 +00:00
31a58df5ed
fix two typos in python(1)
2005-03-20 14:16:03 +00:00
4aec61e0fc
Add a remove() method to collections.deque objects.
2005-03-18 21:20:23 +00:00
09515af5e2
Fix typo.
2005-03-18 10:28:24 +00:00
bea3f6f5c7
Bug #1163325 : "special" decimals aren't hashable
2005-03-15 04:59:17 +00:00
96229b1918
Add two new functions, any() and all().
2005-03-11 06:49:40 +00:00
984f9bb714
operator.itemgetter() and operator.attrgetter() now support extraction
...
of multiple fields. This provides direct support for sorting by
multiple keys.
2005-03-09 16:38:48 +00:00
e2713becd8
Build with --disable-unicode again. Fixes #1158607 .
...
Will backport to 2.4.
2005-03-08 15:03:08 +00:00
b60ae99601
Convert file names of posix.access according to the file system encoding.
2005-03-08 09:10:29 +00:00
78be7df9e4
Patch #918101 : Add tarfile open mode r|* for auto-detection of the
...
stream compression; add, for symmetry reasons, r:* as a synonym of r.
2005-03-05 12:47:42 +00:00
409d8f2ebd
Allow classes to be defined with empty parentheses. This means that
...
``class C(): pass`` is no longer a syntax error.
2005-03-05 06:47:57 +00:00
07eca3a99b
Add a highlight group for denoting bad whitespace. Also added a match rule for
...
leading tabs in a line when in Python mode.
Also fixed some grammatical errors in the comments.
2005-03-05 05:52:21 +00:00
40407943b7
SF #1149508 : ensure textwrap handles hyphenated numbers correctly,
...
eg. "2004-03-04" is not broken across lines. (Merged from 2.4 branch.)
2005-03-05 02:53:17 +00:00
00a73e7715
Patch #1043890 : tarfile: add extractall() method.
2005-03-04 19:40:34 +00:00
fd78a6f7f8
Patches #925152 , #1118602 : Avoid reading after the end of the buffer
...
in pyexpat.GetInputContext. Will backport to 2.4.
2005-03-04 14:37:01 +00:00
c72dd38f30
Patch #1075887 : Don't require MSVC in distutils if there is nothing
...
to build. Will backport to 2.4
2005-03-04 13:50:17 +00:00
637431bf14
Patch #1103407 : Properly deal with tarfile iterators when untarring
...
symbolic links on Windows. Fixes #1100429 . Will backport to 2.4.
2005-03-03 23:12:42 +00:00
96d743ec8b
Patch #1115086 : support PY_LONGLONG in structmember.
2005-03-03 23:00:26 +00:00
b67cc80bb9
SF bug #1155938 : Missing None check for __init__().
2005-03-03 16:45:19 +00:00
4bf108d74f
Patch #802188 : better parser error message for non-EOL following line cont.
2005-03-03 11:45:45 +00:00
a4dac4094a
Patch #645894 : Use getrusage for computing the time consumption in
...
profile.py if available.
2005-03-03 11:39:45 +00:00
7fe60c0a0a
Patches #749830 , #1144555 : allow UNIX mmap size to default to current
...
file size.
2005-03-03 11:22:44 +00:00
df37c8c1ad
Patch #1046831 : Use get_python_version where appropriate in sysconfig.py.
2005-03-03 11:08:03 +00:00
c5574e809b
Patch #1117454 : Remove code to special-case cookies without values
...
in LWPCookieJar. Backported to 2.4.
2005-03-03 10:57:37 +00:00
4ea3eade51
Patch #1117339 : Add cookielib special name tests.
...
Backported to 2.4.
2005-03-03 10:48:12 +00:00
e869eb1953
Patch #1112812 : Make bsddb/__init__.py more friendly for modulefinder.
...
Backported to 2.4.
2005-03-03 09:46:07 +00:00
ff232d7230
Clear internal call error in 'L' format. Fixes #723201 .
...
Backported to 2.4.
2005-03-03 09:24:38 +00:00
f2a8d63e4f
Patch #1110248 : SYNC_FLUSH the zlib buffer for GZipFile.flush.
...
Partially fixes #1110242 .
2005-03-03 08:35:22 +00:00
df24153f65
Patch #1107973 : tarfile.ExFileObject iterators.
2005-03-03 08:17:42 +00:00
8ed338ab44
Patch #1104111 : Alter setup.py --help and --help-commands.
2005-03-03 08:12:27 +00:00
4afe154369
Patch #1121234 : Properly cleanup _exit and tkerror commands.
...
Will backport to 2.4.
2005-03-01 08:09:28 +00:00
9c323f8de4
SF patch #941881 : PEP 309 Implementation (Partial Function Application).
...
Combined efforts of many including Peter Harris, Hye-Shik Chang,
Martin v. Löwis, Nick Coghlan, Paul Moore, and Raymond Hettinger.
2005-02-28 19:39:44 +00:00
9533e34024
Patch #1093585 : raise a ValueError for negative history items in
...
remove_history and replace_history. Will backport to 2.4.
2005-02-27 20:33:25 +00:00
c2a0ac20b7
Patch #1049151 : adding bool support to xdrlib.py.
...
Also add xdrlib._test into the test suite.
2005-02-24 20:22:10 +00:00
af3b39a182
Add support for negative indices in UserString.MutableString.__setitem__
...
and UserString.MutableString.__delitem__.
2005-02-18 13:22:43 +00:00
8e1afab111
NEWS blurb for fix of:
...
[ 1124295 ] Function's __name__ no longer accessible in restricted mode
2005-02-17 14:55:21 +00:00
46d9623875
spwdmodule.c should only be built when either HAVE_GETSPNAM or HAVE_GETSPENT is
...
defined.
2005-02-16 00:07:19 +00:00
ced04e0936
Add mention of patch #1095802 (fixing "Macintosh" references to represent OS
...
X).
2005-02-13 22:53:22 +00:00
4380242580
Modified test for tzset to not rely on tm->tm_zone's existence. Also added
...
sanity checks on tzname if HAVE_TZNAME defined.
Closes bug #1096244 . Thanks Gregory Bond.
2005-02-10 20:48:03 +00:00
bab4143348
SF patch #1116583 : NameError in cookielib domain check
2005-02-05 01:31:19 +00:00
ab630507de
Add NEWS item about future parser bug.
2005-02-04 18:44:06 +00:00
d064142579
Security fix PSF-2005-001 for SimpleXMLRPCServer.py.
2005-02-03 15:01:24 +00:00
faa7648ffe
More bug #1077106 stuff, sorry -- modem induced impatiece!
...
This should go on whatever bugfix branches the other fetches up on.
2005-01-31 17:09:25 +00:00
1d11de6dbd
Revert os.py 1.75, and directly implement update.
...
Fixes #1110478 and #1100235 .
2005-01-29 13:29:23 +00:00
13a1fde4da
Partially revert #1074011 ; don't try to fflush stdin.
...
Backported to 2.3 and 2.4.
2005-01-27 18:56:16 +00:00
9c131f2879
add missing word
2005-01-23 15:16:08 +00:00
8e3ca8af26
Flush std{in,out,err} before closing it. Fixes #1074011 .
...
Will backport to 2.4 and 2.3.
2005-01-23 09:41:49 +00:00
c300175547
Patch #579435 : Shadow Password Support Module
2005-01-23 09:27:24 +00:00
4d394dfebb
Truncate st_?time before comparing it with ST_?TIME in the tests.
2005-01-23 09:19:22 +00:00
d6c6e2224b
distutils/command/install.py change.
2005-01-20 19:20:16 +00:00
46e6d92dc1
tweaks, small updates
2005-01-18 15:53:59 +00:00
058858151d
Document the reconvert module.
2005-01-16 20:48:27 +00:00
fe33d0ba87
Default stat_float_times to true.
2005-01-16 08:57:39 +00:00
22b457e03b
Added SEEK_* constants. Fixes #711830 .
2005-01-16 08:40:58 +00:00
f69d94f6c0
Moved reader \r and \n processing from the iterator to the state machine -
...
this allows for better handling of newline characters in quoted fields (and
hopefully resolves Bug 967934).
2005-01-13 11:30:54 +00:00
0af3ade6aa
Add strptime() constructor to datetime class. Thanks to Josh Spoerri for
...
the changes.
2005-01-13 04:12:31 +00:00
7f2053eff3
Add counting of source iterator lines to the reader object - handy for
...
user error messages (otherwise difficult to do without instrumenting
the source).
2005-01-12 11:17:16 +00:00
0f0599ddc1
When quoting=QUOTE_NONNUMERIC, the reader now casts unquoted fields
...
to floats.
2005-01-12 09:45:18 +00:00
c89f284df8
When using QUOTE_NONNUMERIC, we now test for "numericness" with
...
PyNumber_Check, rather than trying to convert to a float. Reimplemented
writer - now raises exceptions when it sees a quotechar but neither
doublequote or escapechar are set. Doublequote results are now more
consistent (eg, single quote should generate """", rather than "",
which is ambiguous).
2005-01-12 07:44:42 +00:00
31d8896ee2
Rename csv.set_field_limit to csv.field_size_limit (since it both sets and
...
gets).
2005-01-12 03:45:10 +00:00
a08eecb638
Add news about csv module updates.
2005-01-12 03:25:27 +00:00
a422c34b70
SF 1098985: set objects cannot be marshalled
2005-01-11 03:03:27 +00:00
afd77d980e
Add definitions for "up" and "down" commands that print/display the current
...
Python file/line when the current C execution frame is inside
PyEval_EvalFrame. These are commented out by default because GDB sometimes
crashes as a result (seems like a GDB bug).
Add a pyframe command that displays the current Python stack frame. If the
marked lines are uncommented, it will also cause Emacs/XEmacs to display the
current file/line.
2005-01-08 21:56:43 +00:00
e6539c4401
In _DummyThread objects the lock stored in __block (allocated thanks to
...
_Thread.__init__) was never used. This is a waste since locks use OS
primitives that are in limited supply. So the lock is deleted in
_DummyThread.__init__ .
Closes bug #1089632 .
2005-01-08 02:43:53 +00:00
97db05de3e
SF #75103 : imghdr -- identify JPEGs in EXIF format
2005-01-07 08:15:41 +00:00
c34f8673a1
Teach the peephole optimizer to fold simple constant expressions.
2005-01-02 06:17:33 +00:00
3b585b30c0
[Bug #1083110 ] calling .flush() on decompress objects causes a segfault due to an uninitialized pointer: fixes the problem and adds a test case
2004-12-28 20:10:48 +00:00
3673369951
Add NEWS entry about bug #1076985 .
2004-12-22 12:50:50 +00:00
7caafe7018
Changing the idle wrapper to use Python and execvp() to pass arguments to
...
idle.
2004-12-21 02:22:29 +00:00
6065d32325
SF bug #951915 : fix bug in StringIO.truncate - length not changed
...
(Patch by Armin Rigo.)
2004-12-20 23:51:53 +00:00
b0900e6a21
SF #1085304 : Make array.array pickle-able
2004-12-16 16:23:40 +00:00
bb4f1bdd8b
locale.py now uses an updated locale alias table (built using
...
Tools/i18n/makelocalealias.py, a tool to parse the X11 locale
alias file); the encoding lookup was enhanced to use Python's
encoding alias table
As sige-effect, this fixes SF bug [ 1080864 ] locale.py doesn't recognize
valid locale setting.
2004-12-10 21:58:14 +00:00
3557f42658
Combined several entries.
2004-12-07 12:02:02 +00:00
a6b45cc31d
Eliminate the deprecated option to return None instead of a tuple of arguments in __reduce__().
2004-12-07 07:05:57 +00:00
84667c063a
Change code in setup.py for parsing LDFLAGS and CPPFLAGS to use optparse
...
instead of getopt. Required making use of gettext._ as optional (optparse
changed OK'ed by Greg Ward in private email).
2004-12-07 03:25:18 +00:00
516592f4ff
setup.py now uses the library directories specified in LDFLAGS (``-L``
...
directories) and the include directories specified in CPPFLAGS (``-I``
directories) for compiling the extension modules.
This has led to the core being compiled with the values in the shell's
CPPFLAGS. It has also removed the need for special casing to use Fink and
DarwinPorts under darwin since the needed directories can now be specified in
LDFLAGS and CPPFLAGS (e.g., DarwinPorts users can now do
``LDFLAGS=-L/opt/local/lib; CPPFLAGS=-I/opt/local/include; ./configure`` for
everything to work properly).
Parsing the values in the environment variables is done with getopt. While optparse
would have been a nicer solution it cannot be used because of dependency issues
at execution time; optparse uses gettext which uses struct which will not have
been compiled when the code is imported. If optparse ever makes its
importation of gettext optional by catching ImportError and setting _() to an
identity function then it can be used.
2004-12-07 00:42:59 +00:00
c7979f16ec
Removed deprecated tzparse module.
2004-12-05 11:38:18 +00:00
b2594050ea
Added optional None arguments to itertools.islice().
2004-12-05 09:25:51 +00:00
3489cad30a
Removed the deprecated bin parameter from the pickle module.
2004-12-05 05:20:42 +00:00
4ebe364277
Remove the deprecated statcache module.
2004-12-05 04:55:14 +00:00
1bc82f891c
Removed deprecated method arguments from the shelve module.
2004-12-05 03:58:17 +00:00
6c92d76abc
Removed deprecated method from pstats.
2004-12-05 03:28:00 +00:00
f3fa9460de
Removed deprecated use_statcache argument.
2004-12-05 01:58:09 +00:00
664347be94
SF bug #1078905 : Docs for unittest run() methods are misleading
2004-12-04 21:21:53 +00:00
784ab76c87
Remove the deprecated whrandom module.
2004-12-04 10:50:51 +00:00
665174834a
Remove PyRange_New().
2004-12-03 11:45:13 +00:00
f9245578c9
Acknowledge contribution of a thorough tutorial review.
2004-12-03 08:33:32 +00:00
3b0c7c20a1
SF patch #1077353 : add key= argument to min and max
...
(First draft of patch contributed by Steven Bethard.)
2004-12-03 08:30:39 +00:00
4901a1f267
Add key= argument to heapq.nsmallest() and heapq.nlargest().
2004-12-02 08:59:14 +00:00
4277ed8d0a
whoops!
2004-11-30 11:53:10 +00:00
e2648eeb14
doodedoodedoo on the way to 2.4 final
2004-11-30 01:28:55 +00:00
e48bad7a24
preparing for 2.4 final (wooooooo!)
2004-11-29 01:40:31 +00:00
4c79a83e0c
Hye-Shik Chang's fix for Bug 875692.
...
Improve signal handling, especially when using threads, by forcing an early
re-execution of PyEval_EvalFrame() "periodic" code when things_to_do is not
cleared by Py_MakePendingCalls().
M Misc/NEWS
M Python/ceval.c
2004-11-23 18:06:08 +00:00
5cc727ad7b
2.4rc1
2004-11-18 12:32:27 +00:00
39e92ead4b
Mark PyRange_New() as deprecated.
2004-11-18 09:41:45 +00:00
0bb2a65dbd
split functionality into pystack and pystackv commands. The former will
...
work with core dumps because it avoids calling any Python API routines. The
latter prints all the local variable values as well as the stack frames but
won't work with core dumps because it relies on _PyObject_Dump to print
variables.
2004-11-17 16:04:15 +00:00
bbc0d4409c
SF bug 1065388: calendar day/month name lookup too slow
...
__getitem__() methods: compute only the new spellings needed to satisfy
the given indexing object. This is purely an optimization (it should
have no effect on visible semantics).
2004-11-13 16:18:32 +00:00
96b49a51d0
SF patch 1062495: Modules/zipimport.c does not compile on solaris (Contributed by Niki W. Waibel.)
...
Simple renaming to avoid a conflict that prevented compilation on Solaris.
2004-11-10 13:13:05 +00:00
50c6bdb1d6
test_doctest.py test_pdb_set_trace_nested(): A new test from Jim Fulton
...
showing that doctest's pdb.set_trace() support was dramatically broken.
doctest.py _OutputRedirectingPdb.trace_dispatch(): Return a local trace
function instead of (implicitly) None. Else interaction with pdb was
bizarre, noticing only 'call' events. Amazingly, the existing set_trace()
tests didn't care.
2004-11-08 22:07:37 +00:00
fb1ffb0ebb
SF bug 1061968: threads: segfault or Py_FatalError at exit
...
PyGILState_Ensure(): The fix in 2.4a3 for bug 1010677 reintroduced thread
shutdown race bug 225673. Repaired by (once again) ensuring the GIL is
held whenever deleting a thread state.
Alas, there's no useful test case for this shy bug. Four years ago, only
Guido could provoke it, on his box, and today only Armin can provoke it
on his box. I've never been able to provoke it (but not for lack of
trying!).
This is a critical fix for 2.3.5 too, since the fix for 1010677 got
backported there already and so also reintroduced 225673. I don't intend to
backport this fix. For whoever (if anyone) does, there are other thread
fixes in 2.4 that need backporting too, and I bet they need to happen first
for this patch to apply cleanly.
2004-11-08 04:30:21 +00:00
def9d2a17c
Fix for SF bug 988120 via patch 1061941.
...
If read() returned less than the number of bytes request, the full amount was subtracted from length instead of the actually read amount.
2004-11-07 16:13:49 +00:00
7d28e96a41
Add comment about removal of CoreServices/CoreFoundation compilation against
...
the core on OS X (also specifically mention removal of
PyMac_GetAppletScriptFile() ).
2004-11-07 01:19:00 +00:00
90cf212cef
Essentially SF patch 1061679: add missing __all__ to pickletools.py.
...
Harmless.
2004-11-06 23:45:48 +00:00
b12efd3f8a
Comment cleanup.
2004-11-06 19:56:45 +00:00
b0c6630794
post-release
2004-11-04 05:23:17 +00:00
599bd5e1e1
Fix bug 1052242. Also includes rewrite of test case using unittest and
...
avoiding use of popen.
2004-11-04 04:31:30 +00:00
9f41f3a192
release shenanigans
2004-11-03 06:21:37 +00:00
8c72eae237
SF patch #1056967 , changes the semantics of Template.safe_substitute() to not
...
raise a ValueError for dangling delimiters (the delimiter itself is returned).
2004-11-01 03:52:43 +00:00
ead8b7ab30
SF 1055820: weakref callback vs gc vs threads
...
In cyclic gc, clear weakrefs to unreachable objects before allowing any
Python code (weakref callbacks or __del__ methods) to run.
This is a critical bugfix, affecting all versions of Python since weakrefs
were introduced. I'll backport to 2.3.
2004-10-30 23:09:22 +00:00
337614993e
Patch #1044395 : Allow configure option --enable-shared in FreeBSD.
...
(Submitted by James William Pye, Patch revised by Jiwon Seo)
2004-10-26 09:53:46 +00:00
182ac85147
SF #737473 : Show up-to-date source code in tracebacks always.
...
And add an optional argument 'filename' to linecache.checkcache()
to enable checking caches per-file.
2004-10-26 09:16:42 +00:00
561fbf138d
SF bug #1054139 : serious string hashing error in 2.4b1
...
_PyString_Resize() readied strings for mutation but did not invalidate
the cached hash value.
2004-10-26 01:52:37 +00:00
2ef7e6c8f2
SF bug #1052503 : pdb runcall should accept keyword arguments
2004-10-24 00:32:24 +00:00
9047c8f73d
SF bug #1048870 : call arg of lambda not updating
2004-10-24 00:10:06 +00:00
acaffe65a3
Move to version 2 of the PSF license, approved by the Board earlier today.
2004-10-23 03:43:54 +00:00
06a30b087e
Fix minor reST error in Misc/NEWS.
...
Applies patch #1051866 . Thanks Felix Wiemann.
2004-10-22 06:22:54 +00:00
054541e924
Latest version for beta 1.
2004-10-21 23:35:45 +00:00
66e80baea2
Add item
2004-10-20 11:56:15 +00:00
c64aab8400
SF bug #902037 : relative on-disk SYSTEM id handling is incorrect
2004-10-20 08:21:57 +00:00
e54e726f0b
SF patch #1038388 : __main__ for whichdb.py
...
(Contributed by Oleg Broytmann.)
2004-10-20 07:17:16 +00:00
9414ded8f3
Delete empty sections in beta1 news
2004-10-19 19:56:55 +00:00
0d19bae30e
Add item
2004-10-19 19:54:41 +00:00
8abcc5d533
Add support for %U and %W to contribute to calculating the date when the year
...
and day of the week are specified.
Closes bug #1045381 .
2004-10-18 01:37:57 +00:00
be8370dc9c
Add sections for 2.4b2
2004-10-18 01:32:09 +00:00
6a587c160b
release shenanigans
2004-10-15 08:07:21 +00:00
a024034b94
Patch 1046644 - improved distutils support for SWIG.
2004-10-14 10:02:08 +00:00
22dcf66f84
Patch 983206: distutils obeys LDSHARED env var. Removed the code in
...
Python's own setup.py that did the same thing (and tested on Solaris,
where LDSHARED is needed...)
2004-10-13 15:54:17 +00:00
e4f8a48b8f
969574
2004-10-13 14:55:56 +00:00
518d393e0e
Fix PEP number
2004-10-12 15:32:10 +00:00
Michael W. Hudson
Raymond Hettinger
Martin v. Löwis
Brett Cannon
Tim Peters
Walter Dörwald
Bob Ippolito
Anthony Baxter
Matthias Klose
Greg Ward
Jeremy Hylton
Guido van Rossum
Fred Drake
Thomas Heller
Skip Montanaro
Andrew McNamara
Andrew M. Kuchling
Sean Reifschneider
Marc-André Lemburg
Kurt B. Kaiser
Barry Warsaw
Hye-Shik Chang