Mailman 3 August 2020 - Python-Dev

Installation issue on Python-3.5.9 ...
by Saikat Das Aug. 21, 2020

Aug. 21, 2020

Hello Team, While installing Python-3.5.9 in CentOS-5 I am getting the below errors: ======>> [root@manage Python-3.5.9]# grep error config.logconftest.c:11:28: error: ac_nonexistent.h: No such file or directoryconftest.c:11:28: error: ac_nonexistent.h: No such file or directoryconftest.c:54:26: error: minix/config.h: No such file or directoryconftest.c:21:26: error: minix/config.h: No such file or directoryconfigure:6961: gcc -fstrict-aliasing -c -Werror -Wstrict-… [View More]aliasing conftest.c >&5cc1: warnings being treated as errorsconfigure:7017: gcc -Wunused-result -Werror -c conftest.c >&5cc1: error: unrecognized command line option "-Wunused-result"configure:7041: checking for -Werror=declaration-after-statementconfigure:7062: gcc -Werror=declaration-after-statement -c conftest.c >&5cc1: error: unrecognized command line option "-Werror=declaration-after-statement"conftest.c:62:19: error: conio.h: No such file or directoryconftest.c:29:19: error: conio.h: No such file or directoryconftest.c:62:20: error: direct.h: No such file or directoryconftest.c:29:20: error: direct.h: No such file or directoryconftest.c:66:20: error: ieeefp.h: No such file or directoryconftest.c:33:20: error: ieeefp.h: No such file or directoryconftest.c:66:16: error: io.h: No such file or directoryconftest.c:33:16: error: io.h: No such file or directoryconftest.c:68:21: error: process.h: No such file or directoryconftest.c:35:21: error: process.h: No such file or directoryconftest.c:78:25: error: sys/devpoll.h: No such file or directoryconftest.c:45:25: error: sys/devpoll.h: No such file or directoryconftest.c:80:25: error: sys/audioio.h: No such file or directoryconftest.c:47:25: error: sys/audioio.h: No such file or directoryconftest.c:81:24: error: sys/bsdtty.h: No such file or directoryconftest.c:48:24: error: sys/bsdtty.h: No such file or directoryconftest.c:81:23: error: sys/event.h: No such file or directoryconftest.c:48:23: error: sys/event.h: No such file or directoryconftest.c:83:30: error: sys/kern_control.h: No such file or directoryconftest.c:50:30: error: sys/kern_control.h: No such file or directoryconftest.c:83:25: error: sys/loadavg.h: No such file or directoryconftest.c:50:25: error: sys/loadavg.h: No such file or directoryconftest.c:83:22: error: sys/lock.h: No such file or directoryconftest.c:50:22: error: sys/lock.h: No such file or directoryconftest.c:83:23: error: sys/mkdev.h: No such file or directoryconftest.c:50:23: error: sys/mkdev.h: No such file or directoryconftest.c:83:23: error: sys/modem.h: No such file or directoryconftest.c:50:23: error: sys/modem.h: No such file or directoryconftest.c:84:24: error: sys/random.h: No such file or directoryconftest.c:51:24: error: sys/random.h: No such file or directoryconftest.c:90:28: error: sys/sys_domain.h: No such file or directoryconftest.c:57:28: error: sys/sys_domain.h: No such file or directoryconftest.c:90:24: error: sys/termio.h: No such file or directoryconftest.c:57:24: error: sys/termio.h: No such file or directoryconftest.c:98:21: error: libutil.h: No such file or directoryconftest.c:65:21: error: libutil.h: No such file or directoryconftest.c:101:23: error: bluetooth.h: No such file or directoryconftest.c:68:23: error: bluetooth.h: No such file or directoryconftest.c:101:33: error: bluetooth/bluetooth.h: No such file or directoryconftest.c:68:33: error: bluetooth/bluetooth.h: No such file or directory/usr/include/linux/random.h:38: error: expected specifier-qualifier-list before '__u32'/usr/include/linux/random.h:42: error: expected specifier-qualifier-list before '__u32'conftest.c:103:18: error: util.h: No such file or directoryconftest.c:70:18: error: util.h: No such file or directoryconftest.c:105:24: error: sys/endian.h: No such file or directoryconftest.c:72:24: error: sys/endian.h: No such file or directoryconftest.c:81:23: error: linux/can.h: No such file or directoryconftest.c:81:27: error: linux/can/raw.h: No such file or directoryconftest.c:81:27: error: linux/can/bcm.h: No such file or directoryconftest.c:117: error: expected expression before ')' tokenconftest.c:117: error: expected expression before ')' tokenconftest.c:117: error: expected expression before ')' tokenconftest.c:118: error: expected expression before ')' tokenconftest.c:118: error: expected expression before ')' tokenconftest.c:119: error: expected expression before ')' tokenconftest.c:120: error: expected expression before ')' tokenconftest.c:123: error: size of array 'test_array' is negativeconftest.c:121: error: expected expression before ')' tokenconftest.c:124: error: size of array 'test_array' is negativeconftest.c:122: error: expected expression before ')' tokenconftest.c:123: error: '__uint128_t' undeclared (first use in this function)conftest.c:123: error: (Each undeclared identifier is reported only onceconftest.c:123: error: for each function it appears in.)conftest.c:112: error: expected expression before ')' token| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.conftest.c:115:27: error: linux/can/raw.h: No such file or directoryconftest.c:119: error: 'CAN_RAW_FD_FRAMES' undeclared (first use in this function)conftest.c:119: error: (Each undeclared identifier is reported only onceconftest.c:119: error: for each function it appears in.)conftest.c:115:29: error: Carbon/Carbon.h: No such file or directoryconftest.c:119: error: 'FSIORefNum' undeclared (first use in this function)conftest.c:119: error: (Each undeclared identifier is reported only onceconftest.c:119: error: for each function it appears in.)conftest.c:119: error: expected ';' before 'fRef'| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.configure:11281: checking for gai_strerror| /* Override any GCC internal prototype to avoid an error.conftest.c:189: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'me'| /* Override any GCC internal prototype to avoid an error.conftest.c:193: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'me'| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.conftest.c:264: error: 'epoll_create1' undeclared (first use in this function)conftest.c:264: error: (Each undeclared identifier is reported only onceconftest.c:264: error: for each function it appears in.)conftest.c:262:23: error: sys/event.h: No such file or directoryconftest.c:267: error: 'prlimit' undeclared (first use in this function)conftest.c:267: error: (Each undeclared identifier is reported only onceconftest.c:267: error: for each function it appears in.)conftest.c:266: error: 'ctermid_r' undeclared (first use in this function)conftest.c:266: error: (Each undeclared identifier is reported only onceconftest.c:266: error: for each function it appears in.)| /* Override any GCC internal prototype to avoid an error.configure:12030: checking for hstrerror| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.conftest.c:280: error: too many arguments to function 'getpgrp'conftest.c:281: error: too many arguments to function 'setpgrp'| /* Override any GCC internal prototype to avoid an error.conftest.c:326: error: 'struct stat' has no member named 'st_flags'conftest.c:326: error: 'struct stat' has no member named 'st_flags'conftest.c:326: error: 'struct stat' has no member named 'st_gen'conftest.c:326: error: 'struct stat' has no member named 'st_gen'conftest.c:326: error: 'struct stat' has no member named 'st_birthtime'conftest.c:326: error: 'struct stat' has no member named 'st_birthtime'conftest.c:294: error: 'altzone' undeclared (first use in this function)conftest.c:294: error: (Each undeclared identifier is reported only onceconftest.c:294: error: for each function it appears in.)conftest.c:302: error: 'struct sockaddr' has no member named 'sa_len'conftest.c:324:17: error: tcl.h: No such file or directoryconftest.c:326:3: error: #error "NOT UCS4_TCL"| # error "NOT UCS4_TCL"conftest.c:324: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'a'conftest.c:330: error: 'not' undeclared (first use in this function)conftest.c:330: error: (Each undeclared identifier is reported only onceconftest.c:330: error: for each function it appears in.)conftest.c:330: error: expected ';' before 'big'| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.conftest.c:324:31: error: readline/readline.h: No such file or directory| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.| /* Override any GCC internal prototype to avoid an error.conftest.c:324:31: error: readline/readline.h: No such file or directory| /* Override any GCC internal prototype to avoid an error.conftest.c:334: error: 'struct stat' has no member named 'st_mtimespec'conftest.c:351: error: expected expression before ')' tokenconftest.c:342:27: error: stdatomic.h: No such file or directoryconftest.c:343: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'value'conftest.c:344: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'void'conftest.c:346: error: 'value' undeclared (first use in this function)conftest.c:346: error: (Each undeclared identifier is reported only onceconftest.c:346: error: for each function it appears in.)conftest.c:344: error: '__ATOMIC_SEQ_CST' undeclared (first use in this function)conftest.c:344: error: (Each undeclared identifier is reported only onceconftest.c:344: error: for each function it appears in.)/usr/include/linux/random.h:38: error: expected specifier-qualifier-list before '__u32'/usr/include/linux/random.h:42: error: expected specifier-qualifier-list before '__u32'conftest.c:350: error: 'GRND_NONBLOCK' undeclared (first use in this function)conftest.c:350: error: (Each undeclared identifier is reported only onceconftest.c:350: error: for each function it appears in.)conftest.c:352: error: 'SYS_getrandom' undeclared (first use in this function)conftest.c:343:28: error: sys/random.h: No such file or directoryconftest.c:347: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'buflen'conftest.c:347: error: 'buflen' undeclared (first use in this function)conftest.c:347: error: (Each undeclared identifier is reported only onceconftest.c:347: error: for each function it appears in.)ac_cv_func_gai_strerror=yes ======>> Could you please look into this asap :) Thanking you, Saikat Das | Mobile: +91 (996) 623-9368 | Skype: das.saikat Hyderabad, India [View Less]

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Re: Critique of PEP 622 (Structural Pattern Matching)
by Jean Abou Samra Aug. 18, 2020

Aug. 18, 2020

> (the example with changing HTTP_OK value is downright horrifying). As was just mentioned by Guido in another thread, there is a SyntaxWarning to alert you. > This leads to the idea that, if a special syntax if eventually used for Value Patterns, using the comparison operator in it might be useful. Have a look at https://www.mail-archive.com/python-dev@python.org/msg109254.html . Unfortunately, this doesn't scale well with attribute checks... Cheers, Jean Abou Samra

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PEP 622 questions
by Jean Abou Samra Aug. 17, 2020

Aug. 17, 2020

Hi there, As a poor user, I am extremely excited about the possibilities PEP 622 (structural pattern matching) opens. I'd like to ask a few questions. I hope these were not already answered in other threads, which it is hard to follow given the amounts of information. First, I'd like to know wether walrus patterns are encouraged as an expressive way to explain the code in addition to comments, for example: match number: case exact := numbers.Rational(): ... case inexact: ... … [View More]

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Re: PEP 622 questions
by Jean Abou Samra Aug. 17, 2020

Aug. 17, 2020

> OOI, what possibilities? I'm genuinely interested know what problems PEP 622 would solve for you. It's somehow the same use case as Oscar Benjamin's: transform algebraic expressions (the goal being to calculate them step by step -- still under development). You have a series of rules to apply, like transforming x*1 into x, and more complicated ones. These rules can be written naturally using patterns. Also, I have the loose project of writing a new ABC to LilyPond converter (both are … [View More]

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Critique of PEP 622 (Structural Pattern Matching)
by Mark Shannon Aug. 17, 2020

Aug. 17, 2020

Hi all, I've written up a critique of PEP 622. Rather than dump a 2000 line email on you all, I've made a git repo. https://github.com/markshannon/pep622-critique If you have any corrections or additions to suggest, feel free to submit a PR. If you'd rather not submit a PR, for any reason, just send me an email. Cheers, Mark.

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f_localsplus[0] == NULL in super_init_without_args()
by Skip Montanaro Aug. 15, 2020

Aug. 15, 2020

(I'm far from certain this is the correct place for this message. Maybe I should have opened a case on bpo instead?) I got far behind on my register instruction set stuff and in the interim the ground shifted underneath me. I'm still working to try and get the test suite to pass (modulo test_ssl, which I expect to fail on Ubuntu 20.04 for the time being). In trying to track down where my code differs from the main/3.10 branch, I was looking at the super_init_without_args() function in … [View More]

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Summary of Python tracker Issues
by Python tracker Aug. 14, 2020

Aug. 14, 2020

ACTIVITY SUMMARY (2020-08-07 - 2020-08-14) 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 7623 (+25) closed 45673 (+26) total 53296 (+51) Open issues with patches: 3108 Issues opened (40) ================== #33786: @asynccontextmanager doesn't work well with async generators https://bugs.python.org/issue33786 reopened by ned.deily #41505: … [View More]

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Procedure for trivial PRs
by Facundo Batista Aug. 14, 2020

Aug. 14, 2020

Hello! I just proposed a PR with a small fix to the docs. I'd like to know the procedure to land it. https://github.com/python/cpython/pull/21851 It's super small, so no bug is opened for it, and IMO no mention is needed in the NEWS for the fix. It's waiting for a "core review", which is a good thing (and by all means welcomed). But as we're saturated of PRs, the fix is small, and I'm a core developer myself... shall I wait for a review from another core developer, or should I just land … [View More]

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PEP 622 and variadic positional-only args
by Oscar Benjamin Aug. 13, 2020

Aug. 13, 2020

I've taken a look through PEP 622 and I've been thinking about how it could be used with sympy. In principle case/match and destructuring should be useful for sympy because sympy has a class Basic which defines a common structure for ~1000 subclasses. There are a lot of places where it is necessary to dispatch on the type of some object including in places that are performance sensitive so those would seem like good candidates for case/match. However the PEP doesn't quite seem as I hoped … [View More]because it only handles positional arguments indirectly and it does not seem to directly handle types with variadic positional args. The objects I refer to in sympy represent mathematical expressions e.g.: >>> from sympy import * >>> x, y = symbols('x, y') >>> expr = x**2 + 2*x*y >>> expr x**2 + 2*x*y You can see the structure of the object explicitly using sympy's srepr function: >>> print(srepr(expr)) Add(Pow(Symbol('x'), Integer(2)), Mul(Integer(2), Symbol('x'), Symbol('y'))) There are a bunch of classes there (Add, Pow, Symbol, Mul, Integer) but these are a tiny subset of the possibilities. The key feature of Basic instances is that they have an .args attribute which can be used to rebuild the object like: >>> expr.args (x**2, 2*x*y) >>> type(expr) <class 'sympy.core.add.Add'> >>> type(expr)(*expr.args) x**2 + 2*x*y >>> type(expr)(*expr.args) == expr True This is known as the func-args invariant in sympy and is used to destructure and rebuild the expression tree in different ways e.g. for performing a substitution: >>> expr.subs(x, 5) 10*y + 25 All Basic classes are strictly constructed using positional only arguments and not keyword arguments. In the PEP it seems that we can handle positional arguments when their number is fixed by the type. For example a simplified version of Pow could be: class Pow: def __init__(self, base, exp): self.args = (base, exp) __match_args__ == ("base", "exp") @property def base(self): return self.args[0] @property def exp(self): return self.args[1] Then I could match Pow in case/match with obj = Pow(Symbol('x'), Integer(4)) match obj: case Pow(base, exp): # do stuff with base, exp It seems awkward and inefficient though to go through __match_args__ and the base and exp property-methods to match the positional arguments when they are already available as a tuple in obj.args. Note that performance is a concern: just dispatching on isinstance() has a measurable overhead in sympy code which is almost always CPU-bound. The main problem though is with variadic positional arguments. For example sympy has a symbolic Tuple class which is much like a regular python tuple except that it takes multiple positional args rather than a single iterable arg: class Tuple: def __init__(self, *args): self.args = args So now how do I match a 2-Tuple of two integers? I can't use __match_args__ because that's a class attribute and different instances have different numbers of args. It seems I can do this: obj = Tuple(2, 4) match obj: case Tuple(args=(2, 4)): That's awkward though because it doesn't match the constructor syntax which strictly uses positional-only args. It also doesn't scale well with nesting: obj = Tuple(Tuple(1, 2), Tuple(3, 4)) match obj: case Tuple(args=(Tuple(args=(1, 2)), Tuple(args=(3, 4))): # handle ((1, 2), (3, 4)) case Another option would be to fake a single positional argument for matching purposes: class Tuple: __match_args__ == ("args",) def __init__(self, *args): self.args = args match obj: case Tuple((Tuple((1, 2)), Tuple((3, 4)))): This requires an extra level of brackets for each node and also doesn't match the actual constructor syntax: evaluating that pattern in sympy turns each Tuple into a 1-Tuple containing another Tuple of the args: >>> t = Tuple((Tuple((1, 2)), Tuple((3, 4)))) >>> print(srepr(t)) Tuple(Tuple(Tuple(Tuple(Integer(1), Integer(2))), Tuple(Tuple(Integer(3), Integer(4))))) I've used Tuple in the examples above but the same applies to all variadic Basic classes: Add, Mul, And, Or, FiniteSet, Union, Intersection, ProductSet, ... From a first glimpse of the proposal I thought I could do matches like this: match obj: case Add(Mul(x, y), Mul(z, t)) if y == t: case Add(*terms): case Mul(coeff, *factors): case And(Or(A, B), Or(C, D)) if B == D: case Union(Interval(x1, y1), Interval(x2, y2)) if y1 == x2: case Union(Interval(x, y), FiniteSet(*p)) | Union(FiniteSet(*p), Interval(x, y)): case Union(*sets): Knowing the sympy codebase each of those patterns would look quite natural because they resemble the constructors for the corresponding objects (as intended in the PEP). It seems instead that many of these constructors would need to have args= so it becomes: match obj: case Add(args=(Mul(args=(x, y)), Mul(args=(z, t)))) if y == t: case Add(args=terms): case Mul(args=(coeff, *factors)): case And(args=(Or(args=(A, B)), Or(args=(C, D)))) if C == D: case Union(args=(Interval(x1, y1), Interval(x2, y2))) if y1 == x2: case Union(args=(Interval(x, y), FiniteSet(args=p))) | Union(args=(FiniteSet(args=p), Interval(x, y))): case Union(args=sets): Each of these looks less natural as they don't match the constructors and the syntax gets messier with nesting. Oscar [View Less]

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Upcoming 3.7.9 and 3.6.12 Security Releases
by Ned Deily Aug. 12, 2020

Aug. 12, 2020

We are planning to produce security-fix rollup releases for Python 3.7.x and 3.6.x on 2020-08-14. The most recent releases for these versions were on 2020-06-27 and 3.7.8 was the final bugfix release for 3.7. Shortly after those releases, several security issues affecting them were fixed. Because one of those fixes addresses a potential security vulnerability when using Python on Windows (https://bugs.python.org/issue29778), we are making an exception and providing updated binary installers … [View More]

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