[issue28885] Python 3.5.2 strange-behavior issues (from PyPy)

[Brett Cannon]

Brett Cannon added the comment:

I think if you're up for doing individual issues, Armin, that's preferred. But 
if it's too much work we will take it all in this single issue instead of 
risking the loss of the information. And if you want to use this issue as a 
meta one to track everything you report that's obviously fine.

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[issue28885] Python 3.5.2 strange-behavior issues (from PyPy)

[Armin Rigo]

Armin Rigo added the comment:

> Armin, it would help if you report all cases as separate issues.

I asked on python-dev before creating these three issues, and got the opposite 
answer.  If you decide it was a bad idea after all, I will open separate issues 
in the future.

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[issue28885] Python 3.5.2 strange-behavior issues (from PyPy)

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Armin, it would help if you report all cases as separate issues. Some of them 
are already resolved, some can be closed with "won't fix" resolution, others 
need special discussions. This issue can be left as a metaissue.

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[issue28885] Python 3.5.2 strange-behavior issues (from PyPy)

[Armin Rigo]

Armin Rigo added the comment:

(S6) 'xxx' % b'foo' == 'xxx'
 b'xxx' % b'foo' raises TypeError

The first case is because PyMapping_Check() is true on b'foo', so it works like 
'xxx' % {...}, which always just returns 'xxx'.  The second case is because 
_PyBytes_Format() contains more special cases, for bytes and bytearray, which 
are not present in PyUnicode_Format().

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[issue28885] Python 3.5.2 strange-behavior issues (from PyPy)

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

(S3) is a side effect of implementing __eq__ in dict_keys and dict_items. Since 
__eq__ is not implemented in dict_values, __hash__ is inherited from object.

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nosy: +rhettinger

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[issue28885] Python 3.5.2 strange-behavior issues (from PyPy)

[Serhiy Storchaka]

Changes by Serhiy Storchaka :


--
dependencies: +Make sure exceptions raised in __aiter__ are properly chained in 
ceval

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[issue28885] Python 3.5.2 strange-behavior issues (from PyPy)

[Armin Rigo]

Armin Rigo added the comment:

(S5) gregory: actually there is also fchown/chown in the same situation.

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[issue28885] Python 3.5.2 strange-behavior issues (from PyPy)

[Yury Selivanov]

Yury Selivanov added the comment:

I created an issue to track S1: http://bugs.python.org/issue28893

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[issue28885] Python 3.5.2 strange-behavior issues (from PyPy)

[Larry Hastings]

Larry Hastings added the comment:

I assert that Argument Clinic's / PyArg_ParseTuple's handling of bool is 
correct.

* Python has a well-established concept of "truth":

  https://docs.python.org/3/library/stdtypes.html#truth-value-testing

  The C equivalent is, indeed, PyObject_IsTrue().

* When we added the 'p' format unit to PyArg_ParseTuple, I originally had a 
second format unit 'P' that would only accept boolean literal values.  But 
nobody could come up with a use case for it.  So we removed it.  See #14705 for 
the discussion.

* Existing code often does something half-assed here.  eg. stat_float_times 
uses the PyArg_ParseTuple "i" format unit for its boolean parameter, which 
accepts booleans and integers but not strings.  This is strange and 
inconsistent.  (Of course, you can do this with Argument Clinic, just specify 
the parameter as an int.  But, yuck.)

If you have a counter-proposal for how it should behave, I'd be interested to 
hear it.  But as far as I'm concerned, the two legitimate answers for "how to 
handle integers" are either a) accept literally only True and False--an 
approach which nobody has a use case for--or b) PyObject_IsTrue(), which 
behaves exactly like Python.

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[issue28885] Python 3.5.2 strange-behavior issues (from PyPy)

[Gregory P. Smith]

Gregory P. Smith added the comment:

attaching a proposed fix for (S5).  os.chmod should have the same EINTR retry 
treatment as everything else.  That it does not appears to have been an 
oversight.

--
keywords: +patch
Added file: http://bugs.python.org/file45781/os-chmod-EINTR-retry.gps01.diff

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[issue28885] Python 3.5.2 strange-behavior issues (from PyPy)

[Gregory P. Smith]

Gregory P. Smith added the comment:

+larry for (S2) regarding argument clinic's treatment of bool.

--
nosy: +gregory.p.smith, larry

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[issue28885] Python 3.5.2 strange-behavior issues (from PyPy)

[Yury Selivanov]

Yury Selivanov added the comment:

I'll take a look at s1 later tonight

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[issue28885] Python 3.5.2 strange-behavior issues (from PyPy)

[Brett Cannon]

Brett Cannon added the comment:

Victor & Yury for S1.

--
nosy: +haypo, yselivanov

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[issue28885] Python 3.5.2 strange-behavior issues (from PyPy)

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

(S2) is related not to Argument Clinic itself, but to the 'p' format unit added 
in 3.3 (issue14705).

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[issue28885] Python 3.5.2 strange-behavior issues (from PyPy)

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

(S4) was fixed in 3.6 (issue18018). But the fix was not applied to 3.5.

--
dependencies: +SystemError: Parent module '' not loaded, cannot perform 
relative import
nosy: +brett.cannon, serhiy.storchaka

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[issue28885] Python 3.5.2 strange-behavior issues (from PyPy)

[Armin Rigo]

Changes by Armin Rigo :


--
type:  -> behavior

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[issue28885] Python 3.5.2 strange-behavior issues (from PyPy)

[Armin Rigo]

Changes by Armin Rigo :


--
versions: +Python 3.5

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[issue28885] Python 3.5.2 strange-behavior issues (from PyPy)

[Armin Rigo]

Armin Rigo added the comment:

(S2) argument clinic turns the "bool" specifier into
  PyObject_IsTrue(), accepting any argument whatsoever.  This can easily
  get very confusing for the user, e.g. after messing up the number of
  arguments.  For example: os.symlink("/path1", "/path2", "/path3")
  doesn't fail, it just considers the 3rd argument as some true value.

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[issue28885] Python 3.5.2 strange-behavior issues (from PyPy)

[Armin Rigo]

Armin Rigo added the comment:

(S5) pep 475: unclear why 'os.fchmod(fd)' retries automatically when
  it gets EINTR but the otherwise-equivalent 'os.chmod(fd)' does not.
  (The documentation says they are fully equivalent, so someone is
  wrong.)

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[issue28885] Python 3.5.2 strange-behavior issues (from PyPy)

[Armin Rigo]

Armin Rigo added the comment:

(S1) ceval.c: GET_AITER: calls _PyCoro_GetAwaitableIter(), which might
  get an exception from calling the user-defined __await__() or checking
  what it returns; such an exception is completely eaten.

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[issue28885] Python 3.5.2 strange-behavior issues (from PyPy)

[Armin Rigo]

Armin Rigo added the comment:

(S3) hash({}.values()) works (but hash({}.keys()) correctly gives
  TypeError).  That's a bit confusing and, as far as I can tell, always
  pointless.  Also, related: d.keys()==d.keys() but
  d.values()!=d.values().

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[issue28885] Python 3.5.2 strange-behavior issues (from PyPy)

[Armin Rigo]

Armin Rigo added the comment:

(S4) if you write ``from .a import b`` inside the Python prompt, or in
  a module not in any package, then you get a SystemError(!) with an
  error message that is unlikely to help newcomers.

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[issue28885] Python 3.5.2 strange-behavior issues (from PyPy)

[Armin Rigo]

New submission from Armin Rigo:

As discussed on python-dev, I am creating omnibus issues from the lists of 
crashers, of wrong-according-to-the-docs, and of strange-behavior-only issues 
that I found while developing Python 3.5.2 support for PyPy.  These occur with 
CPython 3.5.2 but most of them are likely still here in trunk.

This is the issue containing the "strange behaviors" and some of them, or 
possibly most, will turn out to be my own feelings only and not python-dev's, 
which is fine by me.

--
messages: 282537
nosy: arigo
priority: normal
severity: normal
status: open
title: Python 3.5.2 strange-behavior issues (from PyPy)

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