Mailman 3 September 2021 - Python-Dev

Porting python.gram to Python
by Erik Demaine Sept. 23, 2021

Sept. 23, 2021

Dear python-dev, I've been working on a port of cpython/Grammar/python.gram from C (as currently used in all the {} expressions to build the AST) to Python, directly building nodes via the ast package. My motivation for this (as opposed to calling ast.parse, which uses the C parser) is to make it easy to experiment with adding features to the syntax, without having to build CPython. Porting is mostly straightforward, but it is a fair amount of work, because there are a lot of expressions to port My first question is whether anyone is working on this as well (or has already done so and I missed it), to avoid duplication of effort. Assuming not, my next question is where this belongs. Some natural options I see: 1. Add it to cpython as a grammar maintained in parallel with the C grammar. This would mean more maintenance when the grammar changes, but the plus side is it guarantees that the two grammars (and ast) remain synchronized. 2. PyPy 3. 3rd party library (e.g., my own repo) Let me know what you think would be best. Erik -- Erik Demaine | edemaine(a)mit.edu | http://erikdemaine.org/

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July Steering Council update.
by Thomas Wouters Sept. 23, 2021

Sept. 23, 2021

FYI, I've just published the July steering council update, also included below: https://github.com/python/steering-council/blob/main/updates/2021-07-steeri… Just as a reminder, if you have any questions or concerns, feel free to contact us or open an issue in the SC repo: https://github.com/python/steering-council July 5 - No regular meeting because of the US holiday. - Most of the Steering Council met with Nathaniel Smith to discuss his alternative proposal for PEP 654 <https://www.python.org/dev/peps/pep-0654/> (Exception Groups and except *). - Nathaniel and Carol will work to flesh out his proposal. <https://github.com/python/steering-council/blob/main/updates/2021-07-steeri…>July 12 - Steering Council discussed a clarification request from the PyPA folks around PEPs. It was determined that PyPA folks can sponsor their own PEPs. Brett informed them by responding to the comment. - SC discussed the enum repr() and str() changes in 3.10 and 3.11. - SC discussed PEP 582 <https://www.python.org/dev/peps/pep-0582/> (Python local packages directory). <https://github.com/python/steering-council/blob/main/updates/2021-07-steeri…>July 19 - Steering Council met with Łukasz, the Developer-in-Residence for the first time. The group discussed prioritization, balancing, and how to handle group requests. The Steering Council needs to handle prioritization if folks send Łukasz their lists of jobs. The group also discussed how this role is going to impact the strategic approach of merging issues from bugs.python.org to GitHub. A group Slack channel was created for Łukasz to have a way to ping the SC outside of email. The SC and Łukasz will meet every two weeks for now. - Group discussed PEP 649 <https://www.python.org/dev/peps/pep-0649/> (Deferred Evaluation Of Annotations Using Descriptors) and typing in general. The group determined that they need to discuss the status of typing as part of the language, and write up a PEP to the community so the community knows how to proceed with typing PEPs. - Steering Council will continue to review PEP 648 <https://www.python.org/dev/peps/pep-0648/> (Extensible customizations of the interpreter at startup) and will discuss it via email. <https://github.com/python/steering-council/blob/main/updates/2021-07-steeri…>July 26 - The Steering Council discussed PEP 648 <https://www.python.org/dev/peps/pep-0648/> (Extensible customizations of the interpreter at startup) and decided the PEP needed more use cases and feedback from the community. The group is going to draft a response (reject it and tell them use cases are needed) and Barry will send it. If the PEP author provides use cases the SC can revisit the PEP later. - The SC discussed PEP 467 <https://www.python.org/dev/peps/pep-0467/> (Minor API improvements for binary sequences) and decided that they will recommend removing the bchr builtin from the PEP and then the SC can review the revised PEP if the author wants to revisit it. - Thomas created the private Python committers Discord and Pablo suggested we use it for the next virtual Sprint, which the group agrees with. -- Thomas Wouters <thomas(a)python.org> Hi! I'm an email virus! Think twice before sending your email to help me spread!

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Re: f-strings in the grammar
by Anders Munch Sept. 21, 2021

Sept. 21, 2021

Pablo Galindo Salgado [mailto:pablogsal@gmail.com] wrote: > We already expose APIs that return AST objects that can be used for all sort of things and a tokenizer module that exposes some form of lexing that is relatively close to the one that CPython uses internally. What do you envision tokenize.py will do with f-strings after this? What would be the output of, say, $ echo 'f"hello {world!r}."' | python3 -m tokenize ? regards, Anders

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Re: f-strings in the grammar
by Patrick Reader Sept. 20, 2021

Sept. 20, 2021

I didn't meant to bring back backticks, but to use the semantics they have in shell languages of using backslashes to escape nested substitutions, like this: f"string {code f\"string2 \{code2\} string2\" code} string" Upon reflection though, I agree that since we already use brackets which lend themselves to nesting, it probably does make more sense to use them for nesting. On 20/09/2021 21:25, Guido van Rossum wrote: > On Mon, Sep 20, 2021 at 1:07 PM Patrick Reader <_(a)pxeger.com <http://pxeger.com>> wrote: > > > The current restrictions will also confuse some users (e.g. those used to bash, and IIRC JS, where the rules are similar as what Pablo is proposing). > > -- > > --Guido van Rossum (python.org/~guido <http://python.org/~guido> <http://python.org/~guido>) > > WRT the similar syntax in bash (and similar shells), there are two options: > > "string `code` string" > > "string $(code) string" > > The latter, $(), allows fully-featured nesting in the way Pablo is suggesting: > > "string $(code "string2 $(code2) string2" code) string" > > The former, using backticks, does not allow nesting directly, but it allows extra backslashes inside the backticks to escape the nested ones, like this: > > "string `code "string2 \`code2\` string2" code` string" > > This can be nested infinitely using lots of backslashes. Is this worth considering as another option? It doesn't have the disadvantage of complicating lexing (as much), although nesting with backslashes is quite ugly. IMO nesting things in f-strings would be ugly anyway, so I don't think that would matter too much. > > > F-strings are more like $(...), since the interpolation syntax uses {...} delimiters. So it probably should work that way. JS interpolation works that way too, see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_… . > > I wouldn't want to do anything to bring `backticks` back in the language. > > -- > --Guido van Rossum (python.org/~guido <http://python.org/~guido>) > /Pronouns: he/him //(why is my pronoun here?)/ <http://feministing.com/2015/02/03/how-using-they-as-a-singular-pronoun-can-…>

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Regressions caused the recent work on ceval.c and frame objects
by Victor Stinner Sept. 20, 2021

Sept. 20, 2021

Hi, The recent optimization work on ceval.c and frame objects introduced regressions and the situation is stuck for 4 months (bpo-43760). Right now, maybe the best would be to revert the 2 commits in the 3.10 branch, to get more time in Python 3.11 development cycle to solve these issues. (1) "The DISPATCH() macro is not as efficient as it could be (move PyThreadState.use_tracing)" https://bugs.python.org/issue43760 This change introduced an incompatible C API change. It's not documented in What's New in Python 3.10 and there is no solution for the 4 broken projects (including Cython). I proposed a C API but so far, nobody implemented it. Another option is to fix each project since the list is short. Right now, only 4 projects are known to be broken. Fixing Cython is not enough, you need to get a new release of broken projects (using Cython) to regenerate the C code with the updated Cython. (2) "Performance regression 3.10b1 and later on Windows: Py_DECREF() not inlined in PGO build" https://bugs.python.org/issue45116 Changes made in bpo-43760 caused a performance regression on the PGO build of Windows. It's a tricky issue about thresholds in compiler PGO optimization, inlining or not static inline functions, number of statements per function, etc. It was proposed to workaround the specific case of the huge _PyEval_EvalFrameDefault() function (3500 lines of C code) by converting again some static inline functions to macros. They were macros in Python 3.8 and were fine in Python 3.9. The performance regression with the Windows PGO build was introduced by the recent ceval.c work. Victor -- Night gathers, and now my watch begins. It shall not end until my death.

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Summary of Python tracker Issues
by Python tracker Sept. 17, 2021

Sept. 17, 2021

ACTIVITY SUMMARY (2021-09-10 - 2021-09-17) Python tracker at https://bugs.python.org/ To view or respond to any of the issues listed below, click on the issue. Do NOT respond to this message. Issues counts and deltas: open 7381 ( +5) closed 49587 (+63) total 56968 (+68) Open issues with patches: 2938 Issues opened (37) ================== #45170: tarfile missing cross-directory checking https://bugs.python.org/issue45170 opened by xiongpanju #45171: stacklevel handling in logging module is inconsistent https://bugs.python.org/issue45171 opened by joukewitteveen #45172: netbsd CAN protocol flags addition https://bugs.python.org/issue45172 opened by devnexen #45173: Remove configparser deprecations https://bugs.python.org/issue45173 opened by hugovk #45174: DragonflyBSD fix nis module build https://bugs.python.org/issue45174 opened by devnexen #45176: Many regtest failures on Windows with non-ASCII account name https://bugs.python.org/issue45176 opened by minghua #45178: Support for linking unnamed temporary files into filesystem on https://bugs.python.org/issue45178 opened by WGH #45183: Unexpected exception with zip importer https://bugs.python.org/issue45183 opened by ronaldoussoren #45184: Add `pop` function to remove context manager from (Async)ExitS https://bugs.python.org/issue45184 opened by andreash #45189: Drop the "list_frozen" command from _test_embed. https://bugs.python.org/issue45189 opened by eric.snow #45191: Error.__traceback__.tb_lineno is wrong https://bugs.python.org/issue45191 opened by nahco314 #45192: The tempfile._infer_return_type function cannot infer the type https://bugs.python.org/issue45192 opened by rekyungmin #45193: IDLE Show completions pop-up not working on Ubuntu Linux https://bugs.python.org/issue45193 opened by taleinat #45197: IDLE should suppress ValueError for list.remove() https://bugs.python.org/issue45197 opened by rhettinger #45198: __set_name__ documentation not clear about its usage with non- https://bugs.python.org/issue45198 opened by xitop #45199: IDLE: document search (find) and replace better https://bugs.python.org/issue45199 opened by terry.reedy #45200: test_multiprocessing_fork failws with timeout https://bugs.python.org/issue45200 opened by terry.reedy #45201: API function PySignal_SetWakeupFd is not exported and unusable https://bugs.python.org/issue45201 opened by cy #45203: Improve specialization stats for LOAD_METHOD and BINARY_SUBSC https://bugs.python.org/issue45203 opened by Mark.Shannon #45206: test_contextlib_async logs "Task was destroyed but it is pendi https://bugs.python.org/issue45206 opened by vstinner #45209: multiprocessing tests log: UserWarning: resource_tracker: Ther https://bugs.python.org/issue45209 opened by vstinner #45210: tp_dealloc docs should mention error indicator may be set https://bugs.python.org/issue45210 opened by ezyang #45211: Useful (expensive) information is discarded in getpath.c. https://bugs.python.org/issue45211 opened by eric.snow #45213: Frozen modules are looked up using a linear search. https://bugs.python.org/issue45213 opened by eric.snow #45214: implement LOAD_NONE opcode https://bugs.python.org/issue45214 opened by iritkatriel #45215: Add docs for Mock name and parent args and deprecation warning https://bugs.python.org/issue45215 opened by andrei.avk #45216: Remove redundand information from difflib docstrings https://bugs.python.org/issue45216 opened by serhiy.storchaka #45218: cmath.log has an invalid signature https://bugs.python.org/issue45218 opened by mark.dickinson #45221: Linker flags starting with -h breaks setup.py (regression) https://bugs.python.org/issue45221 opened by ux #45222: test_venv: test_with_pip fails on version 3.8.12 with: pip._ve https://bugs.python.org/issue45222 opened by sxt1001 #45223: test_spawn_doesnt_hang (test.test_pty.PtyTest) fails when stdi https://bugs.python.org/issue45223 opened by Alexander Kanavin #45226: Misleading error message when pathlib.Path.symlink_to() fails https://bugs.python.org/issue45226 opened by dfntlymaybe #45229: Always use unittest for collecting tests in regrtests https://bugs.python.org/issue45229 opened by serhiy.storchaka #45231: make regen-all changes files on Linux https://bugs.python.org/issue45231 opened by vstinner #45233: Allow split key dictionaries with values owned by other object https://bugs.python.org/issue45233 opened by Mark.Shannon #45234: copy_file raises FileNotFoundError when src is a directory https://bugs.python.org/issue45234 opened by Alex Grund #45235: argparse does not preserve namespace with subparser defaults https://bugs.python.org/issue45235 opened by ALSchwalm Most recent 15 issues with no replies (15) ========================================== #45235: argparse does not preserve namespace with subparser defaults https://bugs.python.org/issue45235 #45226: Misleading error message when pathlib.Path.symlink_to() fails https://bugs.python.org/issue45226 #45223: test_spawn_doesnt_hang (test.test_pty.PtyTest) fails when stdi https://bugs.python.org/issue45223 #45221: Linker flags starting with -h breaks setup.py (regression) https://bugs.python.org/issue45221 #45216: Remove redundand information from difflib docstrings https://bugs.python.org/issue45216 #45214: implement LOAD_NONE opcode https://bugs.python.org/issue45214 #45206: test_contextlib_async logs "Task was destroyed but it is pendi https://bugs.python.org/issue45206 #45201: API function PySignal_SetWakeupFd is not exported and unusable https://bugs.python.org/issue45201 #45200: test_multiprocessing_fork failws with timeout https://bugs.python.org/issue45200 #45199: IDLE: document search (find) and replace better https://bugs.python.org/issue45199 #45191: Error.__traceback__.tb_lineno is wrong https://bugs.python.org/issue45191 #45178: Support for linking unnamed temporary files into filesystem on https://bugs.python.org/issue45178 #45174: DragonflyBSD fix nis module build https://bugs.python.org/issue45174 #45172: netbsd CAN protocol flags addition https://bugs.python.org/issue45172 #45171: stacklevel handling in logging module is inconsistent https://bugs.python.org/issue45171 Most recent 15 issues waiting for review (15) ============================================= #45235: argparse does not preserve namespace with subparser defaults https://bugs.python.org/issue45235 #45234: copy_file raises FileNotFoundError when src is a directory https://bugs.python.org/issue45234 #45231: make regen-all changes files on Linux https://bugs.python.org/issue45231 #45229: Always use unittest for collecting tests in regrtests https://bugs.python.org/issue45229 #45223: test_spawn_doesnt_hang (test.test_pty.PtyTest) fails when stdi https://bugs.python.org/issue45223 #45215: Add docs for Mock name and parent args and deprecation warning https://bugs.python.org/issue45215 #45214: implement LOAD_NONE opcode https://bugs.python.org/issue45214 #45210: tp_dealloc docs should mention error indicator may be set https://bugs.python.org/issue45210 #45209: multiprocessing tests log: UserWarning: resource_tracker: Ther https://bugs.python.org/issue45209 #45203: Improve specialization stats for LOAD_METHOD and BINARY_SUBSC https://bugs.python.org/issue45203 #45200: test_multiprocessing_fork failws with timeout https://bugs.python.org/issue45200 #45193: IDLE Show completions pop-up not working on Ubuntu Linux https://bugs.python.org/issue45193 #45192: The tempfile._infer_return_type function cannot infer the type https://bugs.python.org/issue45192 #45191: Error.__traceback__.tb_lineno is wrong https://bugs.python.org/issue45191 #45173: Remove configparser deprecations https://bugs.python.org/issue45173 Top 10 most discussed issues (10) ================================= #45020: Freeze all modules imported during startup. https://bugs.python.org/issue45020 20 msgs #45116: Performance regression 3.10b1 and later on Windows: Py_DECREF( https://bugs.python.org/issue45116 16 msgs #45193: IDLE Show completions pop-up not working on Ubuntu Linux https://bugs.python.org/issue45193 9 msgs #45128: test_multiprocessing_fork fails if run sequentially after test https://bugs.python.org/issue45128 7 msgs #45120: Windows cp encodings "UNDEFINED" entries update https://bugs.python.org/issue45120 5 msgs #42969: pthread_exit & PyThread_exit_thread from PyEval_RestoreThread https://bugs.python.org/issue42969 4 msgs #45218: cmath.log has an invalid signature https://bugs.python.org/issue45218 4 msgs #15870: PyType_FromSpec should take metaclass as an argument https://bugs.python.org/issue15870 3 msgs #21302: time.sleep (floatsleep()) should use clock_nanosleep() on Linu https://bugs.python.org/issue21302 3 msgs #40746: test_gdb failing on 32-bit armv7l when built with GCC -Og: <cl https://bugs.python.org/issue40746 3 msgs Issues closed (59) ================== #4492: httplib code thinks it closes connection, but does not https://bugs.python.org/issue4492 closed by iritkatriel #5846: Deprecate obsolete functions in unittest https://bugs.python.org/issue5846 closed by serhiy.storchaka #9811: strftime strips '%' from unknown format codes on OS X https://bugs.python.org/issue9811 closed by lukasz.langa #17913: stat.filemode returns "-" for sockets and unknown types https://bugs.python.org/issue17913 closed by christian.heimes #19463: assertGdbRepr depends on hash randomization / endianess https://bugs.python.org/issue19463 closed by iritkatriel #22843: doc error: 6.2.4. Match Objects https://bugs.python.org/issue22843 closed by iritkatriel #23774: Test failures when unable to write to install location https://bugs.python.org/issue23774 closed by iritkatriel #25853: Compile error with pytime.h - struct timespec declared inside https://bugs.python.org/issue25853 closed by iritkatriel #29521: Minor warning messages when compiling documentation https://bugs.python.org/issue29521 closed by iritkatriel #30212: test_ssl.py is broken in Centos7 https://bugs.python.org/issue30212 closed by iritkatriel #35474: mimetypes.guess_all_extensions potentially mutates list https://bugs.python.org/issue35474 closed by lukasz.langa #38942: Possible assertion failures in csv.Dialect() https://bugs.python.org/issue38942 closed by iritkatriel #39710: "will be returned as unicode" reminiscent from Python 2 https://bugs.python.org/issue39710 closed by lukasz.langa #43413: tuple subclasses allow arbitrary kwargs https://bugs.python.org/issue43413 closed by serhiy.storchaka #43546: "Impossible" KeyError from importlib._bootstrap acquire line 1 https://bugs.python.org/issue43546 closed by iritkatriel #43893: typing.get_type_hints does not accept type annotations with le https://bugs.python.org/issue43893 closed by gvanrossum #43983: Can't install Python v3.9.4 / 0x80070643 / windows 10 64bit https://bugs.python.org/issue43983 closed by iritkatriel #44786: test_check_c_globals "crashed" and then "FutureWarning: Possib https://bugs.python.org/issue44786 closed by serhiy.storchaka #44987: Speed up unicode normalization of ASCII strings https://bugs.python.org/issue44987 closed by serhiy.storchaka #45013: os.path.isfile fails on path exactly 260 Chars long in Windows https://bugs.python.org/issue45013 closed by steve.dower #45063: PEP 657 Fine Grained Error Locations: omit indicators if they https://bugs.python.org/issue45063 closed by vstinner #45152: Prepare for splitting LOAD_CONST into several opcodes https://bugs.python.org/issue45152 closed by iritkatriel #45155: Add default arguments for int.to_bytes() https://bugs.python.org/issue45155 closed by barry #45156: mock.seal has infinite recursion with int class attributes https://bugs.python.org/issue45156 closed by vstinner #45157: DTrace on RHEL7, generated Include/pydtrace_probes.h fails to https://bugs.python.org/issue45157 closed by vstinner #45162: Remove old deprecated unittest features https://bugs.python.org/issue45162 closed by serhiy.storchaka #45163: Haiku build fix https://bugs.python.org/issue45163 closed by serhiy.storchaka #45167: deepcopy of GenericAlias with __deepcopy__ method is broken https://bugs.python.org/issue45167 closed by lukasz.langa #45168: dis output for LOAD_CONST is confusing https://bugs.python.org/issue45168 closed by iritkatriel #45169: Shallow copy occurs when list multiplication is used to create https://bugs.python.org/issue45169 closed by steven.daprano #45175: No warning with '-W always' and cached import https://bugs.python.org/issue45175 closed by serhiy.storchaka #45177: Use shared test loader when possible when running test suite https://bugs.python.org/issue45177 closed by erlendaasland #45179: List.sort ERROR https://bugs.python.org/issue45179 closed by steven.daprano #45180: possible wrong result for difflib.SequenceMatcher.ratio() https://bugs.python.org/issue45180 closed by tim.peters #45181: Rewrite loading sqlite3 tests https://bugs.python.org/issue45181 closed by serhiy.storchaka #45182: Incorrect use of requires_zlib in test_bdist_rpm https://bugs.python.org/issue45182 closed by serhiy.storchaka #45185: test.test_ssl.TestEnumerations is not run https://bugs.python.org/issue45185 closed by serhiy.storchaka #45186: Marshal output isn't completely deterministic. https://bugs.python.org/issue45186 closed by eric.snow #45187: Some tests in test_socket are not run https://bugs.python.org/issue45187 closed by serhiy.storchaka #45188: De-couple the Windows builds from freezing modules. https://bugs.python.org/issue45188 closed by eric.snow #45190: unicode 14.0 upgrade https://bugs.python.org/issue45190 closed by benjamin.peterson #45194: asyncio scheduler jitter https://bugs.python.org/issue45194 closed by asvetlov #45195: test_readline: test_nonascii() failed on aarch64 RHEL8 Refleak https://bugs.python.org/issue45195 closed by vstinner #45196: macOS. ./configure --with-address-sanitizer; make test; cause https://bugs.python.org/issue45196 closed by gregory.p.smith #45202: Add 'remove_barry_from_BDFL' future to revert effects of 'from https://bugs.python.org/issue45202 closed by eric.smith #45204: test_peg_generator: test_soft_keyword() logs many messages int https://bugs.python.org/issue45204 closed by pablogsal #45205: test_compileall logs "Compiling ..." messages https://bugs.python.org/issue45205 closed by lukasz.langa #45207: test_gdb logs "Function ... not defined" messages https://bugs.python.org/issue45207 closed by lukasz.langa #45208: test_pdb: test_checkline_is_not_executable() logs messages https://bugs.python.org/issue45208 closed by vstinner #45212: Dangling threads in skipped tests in test_socket https://bugs.python.org/issue45212 closed by serhiy.storchaka #45217: ConfigParser does not accept "No value" reversely to the doc https://bugs.python.org/issue45217 closed by lukasz.langa #45219: Expose indexing and other simple operations on dict-keys in in https://bugs.python.org/issue45219 closed by Mark.Shannon #45220: Windows builds sometimes fail on Azure and GitHub Action: fata https://bugs.python.org/issue45220 closed by steve.dower #45224: Argparse shows required arguments as optional https://bugs.python.org/issue45224 closed by rhettinger #45225: use map function instead of genexpr in capwords https://bugs.python.org/issue45225 closed by rhettinger #45227: Control reaches end of non-void function in specialize.c https://bugs.python.org/issue45227 closed by kj #45228: Stack buffer overflow in parsing J1939 network address https://bugs.python.org/issue45228 closed by serhiy.storchaka #45230: Something wrong when Calculate "3==3 is not True" https://bugs.python.org/issue45230 closed by serhiy.storchaka #45232: ascii codec is used by default when LANG is not set https://bugs.python.org/issue45232 closed by lemburg

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What's the rule for issuing line tracing numbers when using a tracing function?
by Fabio Zadrozny Sept. 17, 2021

Sept. 17, 2021

Hi all, I have a weird case where I thought line events would be issued and yet they aren't even though they're in the instructions in the bytecode (both in 3.9 and 3.10). i.e.: Given the code: def check_backtrack(x): # line 1 if not (x == 'a' # line 2 or x == 'c'): # line 3 pass # line 4 it has dis.dis such as: 2 0 LOAD_FAST 0 (x) 2 LOAD_CONST 1 ('a') 4 COMPARE_OP 2 (==) 6 POP_JUMP_IF_TRUE 12 (to 24) 3 8 LOAD_FAST 0 (x) 10 LOAD_CONST 2 ('c') 12 COMPARE_OP 2 (==) 2 14 POP_JUMP_IF_TRUE 10 (to 20) 4 16 LOAD_CONST 0 (None) 18 RETURN_VALUE 2 >> 20 LOAD_CONST 0 (None) 22 RETURN_VALUE >> 24 LOAD_CONST 0 (None) 26 RETURN_VALUE So, by just following the instructions/line numbers, I'd say that when the instruction: 2 14 POP_JUMP_IF_TRUE 10 (to 20) is executed, a line event would take place, yet, this isn't true, but if that offset is changed to include more instructions then such a line event is issued. i.e.: something as: def tracer(frame, event, arg): print(frame, event) return tracer import sys sys.settrace(tracer) check_backtrack('f') prints: 1 call 2 line 3 line 4 line 4 return when I expected it to print: 1 call 2 line 3 line 2 line |<-- this is not being issued 4 line 4 return So, I have some questions related to this: Does anyone know why this happens? What's the rule to identify this? Why is that line number assigned to that instruction (i.e.: it seems a bit odd that this is set up like that in the first place)? Thanks, Fabio p.s.: I'm asking because in a debugger which changes bytecode I want to keep the same semantics and it appears that if I add more bytecode at that instruction offset, those semantics aren't kept (but I don't really know what are the semantics to keep here since it seems like that instruction should issue a line event even though it doesn't).

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python3.10rc2 compilation on android/termux/clang12.0.1 fails
by Sandeep Gupta Sept. 17, 2021

Sept. 17, 2021

I am trying to compile Python3.10rc2 on rather unusual platform (termux on android). The gcc version is listed below: ~ $ g++ -v clang version 12.0.1 Target: aarch64-unknown-linux-android24 Thread model: posix InstalledDir: /data/data/com.termux/files/usr/bin I get following warnings and errors: Python/pytime.c:398:10: warning: implicit conversion from 'long' to 'double' changes value from 9223372036854775807 to 9223372036854775808 [-Wimplicit-const-int-float-conver sion] if (!_Py_InIntegralTypeRange(_PyTime_t, d)) { Python/bootstrap_hash.c:141:17: error: implicit declaration of function 'getrandom' is invalid in C99 [-Werror,-Wimplicit-function-declaration] n = getrandom(dest, n, flags); ^ Python/bootstrap_hash.c:145:17: error: implicit declaration of function 'getrandom' is invalid in C99 [-Werror,-Wimplicit-function-declaration] n = getrandom(dest, n, flags); Not sure if this is limitation of the platform or Python codebase needs fixes. Thanks -S

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Discussion about how to manage additions/removals to the stdlib
by Brett Cannon Sept. 16, 2021

Sept. 16, 2021

https://discuss.python.org/t/how-do-we-want-to-manage-additions-removals-to… This comes from my language summit talk on the stdlib to help clarify some things about how we manage the stdlib from the perspective of additions/deletions. FYI I will be *muting this email thread immediately*, so please participate on discuss.python.org if you have anything to say (I almost didn't post here, but I figured I would see if there's any chance people will follow through on discuss.python.org if directed there and told feedback here will be ignored).

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How to decipher Windows errors on builds?
by Mark Shannon Sept. 16, 2021

Sept. 16, 2021

Hi, I'm getting build errors on Windows for https://github.com/python/cpython/pull/28386 The error message is: C:\Program Files (x86)\Windows Kits\10\Include\10.0.22000.0\um\winnt.h(253): error RC2188: D:\a\cpython\cpython\PCbuild\obj\311win32_Release\pythoncore\RCa01688(47) : fatal error RC1116: RC terminating after preprocessor errors [D:\a\cpython\cpython\PCbuild\pythoncore.vcxproj] Can anyone translate that into English for me? It suggests that there are errors in the preprocessor. But how do I tell what the error is? Cheers, Mark.

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