[issue34364] problem with traceback for syntax error in f-string

2018-09-24 Thread Eric V. Smith


Eric V. Smith  added the comment:

I worked on this at the core sprint, and I have a patch almost ready.

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[issue34776] Postponed annotations break inspection of dataclasses

2018-09-24 Thread Eric V. Smith


Eric V. Smith  added the comment:

Ned: I'm marking this as a release blocker because I'd like to get it in 3.7.1. 
If I can't do that in the next 5 hours or so, I'll remove the release blocker 
tag.

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[issue34364] problem with traceback for syntax error in f-string

2018-09-24 Thread Eric V. Smith


Eric V. Smith  added the comment:

It's more elaborate than I'd like, but I think it's the right way to solve it: 
I'm passing in the starting line and column number to the parser machinery.

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[issue34776] Postponed annotations break inspection of dataclasses

2018-09-24 Thread Eric V. Smith


Eric V. Smith  added the comment:

Unfortunately, I'm not going to be able to give this the attention it deserves 
before the 3.7.1 cutoff. The changes are sufficiently tricky that I want to 
make sure I think through the issue in the appropriate detail.

Ned: I've made it not a release blocker. Please remove yourself as nosy if you 
don't care about this issue. I don't plan on making it a release blocker again, 
I just did that because it was so near the deadline.

Yury: Sorry for not being able to get delve in to it sufficiently. Thanks for 
your work on it.

I should be able to review this in the next few days, so we can get this in to 
3.7.2.

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[issue34776] Postponed annotations break inspection of dataclasses

2018-09-23 Thread Eric V. Smith


Eric V. Smith  added the comment:

[Adding to nosy people who were on the original email]

Copying (part of) my response from the email thread:

These work:
print(get_type_hints(Bar.__init__, globals()))
print(get_type_hints(Bar.__init__, Bar.__module__))

But I agree that maybe doing something with dataclasses to address this would 
be good. Especially as the first one requires being in the same module as Foo.

See this for Yury's self-described "hack-ish fix we can use" until we do 
something better:

https://gist.github.com/1st1/37fdd3cc84cd65b9af3471b935b722df

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[issue35271] venv creates pyvenv.cfg with wrong home

2018-11-18 Thread Eric V. Smith


Eric V. Smith  added the comment:

You're going to have to provide some information, we can't guess at what's 
going on. At the very least:

What OS? What shell? Which exact version of Python? How was it installed? Where 
is the file pyvenv.cfg that shows the problem? What are its entire contents? 
What are all of your environment variable?

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[issue35626] Python dictreader KeyError issue

2018-12-31 Thread Eric V. Smith


Eric V. Smith  added the comment:

Steven is correct: your problem is that in the first example you're reading the 
header row before you pass the file to DictReader, so the DictReader cannot 
know what your columns are named. (Actually, your code uses the second row of 
your file as the column names: you should have been able to determine this by 
looking at the value of "row" that was printed).

I'm going to close this issue. Please do some more investigation. If you can 
produce a short example that we can execute ourselves, including any needed 
data files, and you think it still shows an error, please feel free to reopen 
this issue.

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[issue8538] Add FlagAction to argparse

2018-12-27 Thread Eric V. Smith


Eric V. Smith  added the comment:

Yes, this is the correct bug tracker.

And note that this code isn't mine, I just posted it here so it wouldn't be 
lost. It looks like the original message was from 
https://mail.python.org/pipermail/python-dev/2010-April/099704.html

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[issue35617] unittest discover does not work with implicit namespaces

2018-12-30 Thread Eric V. Smith


Change by Eric V. Smith :


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[issue35638] Introduce fixed point locale aware format type for floating point numbers

2019-01-02 Thread Eric V. Smith


Eric V. Smith  added the comment:

I haven't looked at this closely yet, but you'll need to at least:
- add tests that the locale-aware formatting is happening
- support decimal
- make sure it works with complex (which it probably does, but needs a test)

And, I think we'll need to run this through python-ideas first. One thing I 
expect to come up there: why f and not g?

Again, I haven't looked through the code yet, or really even given any thought 
to determining if this is a sound idea.

--
title: Introduce fixed point locale awear format type for floating point 
numbers -> Introduce fixed point locale aware format type for floating point 
numbers

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[issue35646] python -v writes to stderr

2019-01-03 Thread Eric V. Smith


Eric V. Smith  added the comment:

That's just the way it is with 2.7.

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[issue35646] python -v writes to stderr

2019-01-02 Thread Eric V. Smith


Eric V. Smith  added the comment:

-v writes to stderr, so this is the expected behavior. Although maybe this 
could be better documented.

See issue 18338, where this was briefly discussed and a change was rejected.

Maybe you're looking for -V (uppercase) or --version, which do write to stdout, 
at least in 3.x. I'm not sure where they write in 2.7, but it's much too late 
to change 2.7's behavior.

I'm going to close this. If you find some of our documentation that says -v 
writes to stdout, then we can reopen this.

This is not a Windows specific error, so I'm modifying the nosy list.

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title: Subprocess.Popen('python -v',stdout=PIPE,stderr=PIPE,Shell=True) gives 
output in stderr -> python -v writes to stderr

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[issue35750] process finished with exit code -1073740940 (0xc0000374)

2019-01-16 Thread Eric V. Smith


Eric V. Smith  added the comment:

I assume this is on Windows? 0xc374 is a heap corruption error on Windows.

I agree that without a way to reproduce this it will be impossible to track 
down any error.

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[issue35761] Allow dataclasses to be updated in place

2019-01-17 Thread Eric V. Smith


Eric V. Smith  added the comment:

What would the interaction be between other_instance and changes? Why is this 
API different from .replace()?

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[issue17005] Add a topological sort algorithm

2019-01-18 Thread Eric V. Smith


Eric V. Smith  added the comment:

This is why I prefer the API exposed by https://pypi.org/project/toposort/

list(toposort({2: {11},
   9: {11, 8, 10},
   10: {11, 3},
   11: {7, 5},
   8: {7, 3},
  }))

returns [{3, 5, 7}, {8, 11}, {2, 10}, {9}]

For an node with no edges, use an empty set:

list(toposort({100: set(),
   2: {11},
   9: {11, 8, 10},
   10: {11, 3},
   11: {7, 5},
   8: {7, 3},
  }))
[{3, 100, 5, 7}, {8, 11}, {2, 10}, {9}]

I also don't think we should provide multiple APIs. Let's just provide one, and 
recipes for any helpers, if needed. For example, to flatten the result into a 
list. Or to take a list of edges as the input.

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[issue35787] shlex.split inserts extra item on backslash space space

2019-01-20 Thread Eric V. Smith


Eric V. Smith  added the comment:

I agree that the current behavior makes sense. I think "preserve the literal 
value of the next character" means the space won't be interpreted as a 
separator.

In the first example (I think better written as shlex.split(r'a \ b')), the 
first space is a separator. The second space is not a separator because of the 
backslash, so it's part of the second token ' b'.

In the second example (shlex.split(r'a \  b')), the first space is a separator, 
the second space is not a separator because of the backslash, and the third 
space is a separator. This explains why there's no space before the 'b'.

I assume peter.otten's example is bash. I can confirm with zsh:

[~]$ python3 -c 'import sys; print(sys.argv)' a   b
['-c', 'a', 'b']
[~]$ python3 -c 'import sys; print(sys.argv)' a \ b
['-c', 'a', ' b']
[~]$ python3 -c 'import sys; print(sys.argv)' a \  b
['-c', 'a', ' ', 'b']

I'm going to close this. But anyone wants to suggest a documentation patch, 
feel free to reopen this.

Also, changing this would no doubt break some code, so I'd recommend against 
changing it even if I didn't think it was doing the right thing.

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stage:  -> resolved
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[issue35761] Allow dataclasses to be updated in place

2019-01-17 Thread Eric V. Smith


Eric V. Smith  added the comment:

I agree that I don't see the point, unless there's something I'm missing with 
other_instance. Or maybe the proposal is for it to also work with frozen 
dataclasses? I'm definitely -1 on that.

So unless there's something I'm missing where normal attribute assignment 
wouldn't work, I'm leaning toward rejecting this. What is it about dataclasses 
that would need this feature, where regular classes don't? Just do what you'd 
do with regular classes.

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[issue9334] argparse: add a full fledged parser as a subparser

2018-12-12 Thread Eric V. Smith


Eric V. Smith  added the comment:

Why the title change? The original problem still exists, and I don't see how 
it's related to subparsers.

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[issue35546] String formatting produces incorrect result with left-aligned zero-padded format

2018-12-20 Thread Eric V. Smith


Eric V. Smith  added the comment:

I think this falls in to the consenting adults category. You can also do things 
like:
>>> format(42, '->3')
'-42'

But why bother preventing this?

It is unfortunate that %-formatting and .__format__() are different in this 
regard, but at this point I wouldn't recommend making any changes.

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[issue35494] Inaccurate error message for f-string

2018-12-14 Thread Eric V. Smith


Change by Eric V. Smith :


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[issue35494] Inaccurate error message for f-string

2018-12-14 Thread Eric V. Smith


Eric V. Smith  added the comment:

Go ahead, Serhiy. Thanks!

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[issue35540] dataclasses.asdict breaks with defaultdict fields

2018-12-19 Thread Eric V. Smith


Change by Eric V. Smith :


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[issue35358] avoid '-' in importlib.import_module and builtins.__import__

2018-11-30 Thread Eric V. Smith


Eric V. Smith  added the comment:

I dynamically load a lot of modules whose names contain hyphens, or are 
otherwise non-identifiers (like 3rdparty.py). The suggested change would break 
a lot of working code.

The only thing I can see being possible is to add a warning that no one would 
likely ever see. So I think we should take no action here.

--
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type:  -> enhancement
versions:  -Python 3.5, Python 3.6, Python 3.7

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[issue35421] Expected result is not clear in case of list.append(list)

2018-12-05 Thread Eric V. Smith


Eric V. Smith  added the comment:

The ... denotes a recursive data structure, which is what you've created here 
by "a" including itself as an element. I'm not clear what you expected to see, 
but I'm going to close this because I don't see an actual problem here. If you 
think there's a bug in Python, please describe it here. Also make sure to 
include what you expect to see in addition to what you do see.

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stage:  -> resolved
status: open -> closed

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[issue35393] Typo in documentation

2018-12-03 Thread Eric V. Smith


Eric V. Smith  added the comment:

Can you be more specific? There's not enough information here to take any 
action.

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[issue35432] str.format and string.Formatter bug with French (and other) locale

2018-12-06 Thread Eric V. Smith


Eric V. Smith  added the comment:

Possibly related to issue 33954?

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[issue35271] venv creates pyvenv.cfg with wrong home

2018-11-19 Thread Eric V. Smith


Change by Eric V. Smith :


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[issue35710] Make dataclasses.field() accept another name for __init__ field's name

2019-01-10 Thread Eric V. Smith


Change by Eric V. Smith :


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[issue35673] Loader for namespace packages

2019-01-08 Thread Eric V. Smith


Eric V. Smith  added the comment:

I think exposing _NamespaceLoader as NamespaceLoader and registering the ABC 
make sense. That would make this in to a feature request for 3.8.

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[issue35673] Loader for namespace packages

2019-01-07 Thread Eric V. Smith


Eric V. Smith  added the comment:

Namespace packages (PEP 420) predate ModuleSpec (PEP 451). So, I think this 
probably happened when 451 was implemented. Maybe Eric Snow recalls?

I say this without having looked at it very deeply.

As to why the namespace package loader is a private class: it never occurred to 
me someone would care about inspecting it.

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[issue35594] Python script generating Segmentation Fault

2018-12-28 Thread Eric V. Smith


Eric V. Smith  added the comment:

Thanks for the report, but that example is so large and complicated that it's 
difficult for someone not familiar with it to understand what's going on.

If you could simplify it down to the smallest example that duplicates the 
problem, then perhaps we could make more progress.

Short of that, one thing you should look at is Victor's faulthander work: 
https://docs.python.org/3/library/faulthandler.html . It might give enough 
information to diagnose the problem.

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[issue35638] Introduce fixed point locale awear format type for floating point numbers

2019-01-02 Thread Eric V. Smith


Eric V. Smith  added the comment:

Of course, feel free to create a PR. But the correct place to discuss any new 
behavior is on the issue tracker, or maybe on python-ideas, not in a PR.

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[issue35638] Introduce fixed point locale awear format type for floating point numbers

2019-01-02 Thread Eric V. Smith


Eric V. Smith  added the comment:

Since this is a new feature, it can only be added to 3.8. Adjusting versions 
accordingly.

I suggest that if we add this at all, it only be added to __format__, not to 
%-formatting.

Any suggestions on a specification for this?

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nosy: +eric.smith
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[issue35638] Introduce fixed point locale awear format type for floating point numbers

2019-01-02 Thread Eric V. Smith


Eric V. Smith  added the comment:

Before a patch is created, we should discuss the behavior that will be 
implemented and agree on it. What is your suggestion?

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[issue34409] Add a way to customize iteration over fields in asdict() for the nested dataclasses

2018-09-12 Thread Eric V. Smith


Eric V. Smith  added the comment:

Thanks, Raymond. I agree that this request is too specialized to add to 
dataclasses. Any proposal here or that I've been able to think of complicate 
the API for the much more common use case of not needing asdict() 
specialization.

To the original poster: I suggest you just implement the functionality you need 
in a custom version of asdict() yourself. As noted, all of the information 
needed for a custom asdict() are publicly available.

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[issue34653] PyParser_SimpleParseStringFilename should be deleted

2018-09-12 Thread Eric V. Smith


New submission from Eric V. Smith :

There are 6 PyParser_SimpleParse* functions in pythonrun.c. 5 of them are 
documented in c-api/veryhigh.rst and appear in pythonrun.h. But 
PyParser_SimpleParseStringFilename is not documented and is not in any .h file.

I propose we delete PyParser_SimpleParseStringFilename. It's not documented, 
it's not in a .h file, and it's not called from within Python's source. It's 
also trivial to implement in terms of PyParser_SimpleParseStringFlagsFilename.

--
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components: Interpreter Core
messages: 325189
nosy: eric.smith
priority: normal
severity: normal
status: open
title: PyParser_SimpleParseStringFilename should be deleted
type: enhancement
versions: Python 3.7, Python 3.8

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[issue34363] dataclasses.asdict() mishandles dataclass instance attributes that are instances of subclassed typing.NamedTuple

2018-09-14 Thread Eric V. Smith


Eric V. Smith  added the comment:


New changeset 9b9d97dd139a799d28ff8bc90d118b1cac190b03 by Eric V. Smith in 
branch 'master':
bpo-34363: dataclasses.asdict() and .astuple() now handle fields which are 
namedtuples. (GH-9151)
https://github.com/python/cpython/commit/9b9d97dd139a799d28ff8bc90d118b1cac190b03


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[issue34653] PyParser_SimpleParseStringFilename should be deleted

2018-09-14 Thread Eric V. Smith


Eric V. Smith  added the comment:

I'm not going to backport this to 3.7, just in case.

--
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status: open -> closed
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[issue34683] Caret positioned wrong for SyntaxError reported by ast.c

2018-09-14 Thread Eric V. Smith


Eric V. Smith  added the comment:

I think Benjamin's diagnosis is correct. In which case, my f-string error 
reporting changes (see #34364) won't intersect with a fix to this issue.

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[issue34682] Typo reports on docs@

2018-09-14 Thread Eric V. Smith


Eric V. Smith  added the comment:

Agreed with @geoffreyspear: "means" is okay, the rest of the changes look good.

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[issue34683] Caret positioned wrong for SyntaxError reported by ast.c

2018-09-14 Thread Eric V. Smith


Eric V. Smith  added the comment:

I'm doing some fairly major surgery on line and column numbers for fixing 
f-string errors. I'll see if I can include this case, too.

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[issue34363] dataclasses.asdict() mishandles dataclass instance attributes that are instances of subclassed typing.NamedTuple

2018-09-14 Thread Eric V. Smith


Eric V. Smith  added the comment:


New changeset 78aa3d8f5204bc856d7b2eb67288cf90c6a30660 by Eric V. Smith (Miss 
Islington (bot)) in branch '3.7':
bpo-34363: dataclasses.asdict() and .astuple() now handle fields which are 
namedtuples. (GH-9151) (GH-9304)
https://github.com/python/cpython/commit/78aa3d8f5204bc856d7b2eb67288cf90c6a30660


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[issue34363] dataclasses.asdict() mishandles dataclass instance attributes that are instances of subclassed typing.NamedTuple

2018-09-14 Thread Eric V. Smith


Change by Eric V. Smith :


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[issue34690] Store startup modules as C structures for 20%+ startup speed improvement

2018-09-14 Thread Eric V. Smith


Change by Eric V. Smith :


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[issue34363] dataclasses.asdict() mishandles dataclass instance attributes that are instances of subclassed typing.NamedTuple

2018-09-11 Thread Eric V. Smith


Eric V. Smith  added the comment:

The question here is: what should asdict() return if the dataclass contains a 
namedtuple? What the code is trying to do (but currently failing!) is to return 
another namedtuple, but with the values returned by recursively calling in to 
asdict() (or rather, its helper function) for each field in the namedtuple.

I think this is the correct behavior. Specifically, I do not want to call the 
namedtuple's _asdict() method. There are two problems with _asdict():

1. It doesn't recurse in to the fields, like asdict() normally does with a 
dict, list, or tuple.

2. It returns a dict! This is a problem because if a dataclass field contains a 
dict which has a key which is a namedtuple, then asdict() would fail.

Here's an example of #2 above, if asdict() on a namedtuple field returns a dict:

@dataclass
class C:
f: 'Any'

T = namedtuple('T', 'a')

c = C({T('an a'): 0})
print('c:', c)
print(asdict(c))   # <- error here

prints:

c: C(f={T(a='an a'): 0})
Traceback (most recent call last):
...
  File "/home/eric/python/lib/dataclasses.py", line 1019, in asdict
return _asdict_inner(obj, dict_factory)
  File "/home/eric/python/lib/dataclasses.py", line 1026, in _asdict_inner
value = _asdict_inner(getattr(obj, f.name), dict_factory)
  File "/home/eric/python/lib/dataclasses.py", line 1059, in _asdict_inner
for k, v in obj.items())
TypeError: unhashable type: 'collections.OrderedDict'

So, although it's unfortunate, I think the only reasonable thing to do in this 
case is to have asdict() on a namedtuple return another namedtuple. Here's how 
that looks using the above code:

c: C(f={T(a='an a'): 0})
{'f': {T(a='an a'): 0}}

Admittedly, this can't be used with json.dumps() (you get "TypeError: keys must 
be str, int, float, bool or None, not T"), but I think it's the best we can do. 
It's consistent with any other class derived from tuple or list: asdict() will 
convert it to a copy of the class, recursing into each item that's in the tuple 
or list.

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[issue34409] Add a way to customize iteration over fields in asdict() for the nested dataclasses

2018-09-11 Thread Eric V. Smith


Eric V. Smith  added the comment:

I've been thinking about this, but I don't have a suggestion on how to improve 
the API. Maybe some sort of visitor pattern? I'm open to concrete ideas.

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[issue34707] Python not reentrant

2018-09-17 Thread Eric V. Smith


Eric V. Smith  added the comment:

I think this is along the lines of a recent discussion on the c-api mailing 
list about passing a context value (your handle) to every C call. See this 
message for some discussion: 
https://mail.python.org/mm3/archives/list/capi-...@python.org/message/ZN6BJVUGIOGWKHY47PKPX5Z3SGCYUAX5/

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[issue34653] PyParser_SimpleParseStringFilename should be deleted

2018-09-13 Thread Eric V. Smith


Change by Eric V. Smith :


--
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[issue35820] Inconsistent behavior when parsing IP address

2019-01-24 Thread Eric V. Smith

Eric V. Smith  added the comment:

>From the documentation of IPv4Address:

The following constitutes a valid IPv4 address:

1. A string in decimal-dot notation, consisting of four decimal integers in the 
inclusive range 0–255, separated by dots (e.g. 192.168.0.1). Each integer 
represents an octet (byte) in the address. Leading zeroes are tolerated only 
for values less than 8 (as there is no ambiguity between the decimal and octal 
interpretations of such strings).

21 is not less than 8, so you get this error. I think this is working as it's 
documented.

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[issue35834] get_type_hints exposes an instance of ForwardRef (internal class) in its result, with `from __future__ import annotations` enabled

2019-01-26 Thread Eric V. Smith


Change by Eric V. Smith :


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[issue36524] identity operator

2019-04-04 Thread Eric V. Smith


Eric V. Smith  added the comment:

I'm not sure what you're asking here. You're comparing the result of the print 
function to a value. Print returns None, so it doesn't compare equal to any of 
the values you're comparing it to.

To see what's happening, try:

>>> print(None) == None
None
True

But really, your problem is probably a misunderstanding of the return value of 
the print function.

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[issue36524] identity operator

2019-04-04 Thread Eric V. Smith


Change by Eric V. Smith :


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[issue36480] .strip() unexpected output on Windows

2019-03-29 Thread Eric V. Smith


Eric V. Smith  added the comment:

Please provide the exact code to duplicate the problem.

I suspect this is a problem with your code, not with str.strip and not with 
Windows.

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[issue36384] ipaddress Should not reject IPv4 addresses with leading zeroes as ambiguously octal

2019-03-30 Thread Eric V. Smith


Eric V. Smith  added the comment:

I think it should be 3.8 only, and the docs should be updated. Apologies for 
not catching that earlier: I searched via Google, which was a mistake.

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[issue36480] .strip() unexpected output on Windows

2019-03-30 Thread Eric V. Smith


Eric V. Smith  added the comment:

I cannot run that example on my computer.

Please reduce this to a single line of code, with no imports, that calls 
.strip() and shows your problem. Ideally you will just use constants, and not 
computed strings.

Something like:

>>> 'magenta.zip'.strip('pizamn')
'genta.'

And also, show that exact same line of code executed on both platforms.

That said, the problem is likely in your usage of .strip(). Please re-read the 
documentation: it does not remove substrings from a given string, it removes 
any of the given characters from the beginning and end of the string.

So, this is correct:
>>> 'magenta.zip'.strip('pm')
'agenta.zi'

You're probably seeing some difference due to upper or lower case filenames on 
the two platforms.

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[issue36480] .strip() unexpected output on Windows

2019-03-30 Thread Eric V. Smith


Change by Eric V. Smith :


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stage:  -> resolved
status: open -> closed

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[issue11644] Cross-link 2to3 documentation, what’s new and pyporting howto

2019-03-23 Thread Eric V. Smith


Eric V. Smith  added the comment:

I agree we should close this.

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[issue36384] ipaddress Should not reject IPv4 addresses with leading zeroes as ambiguously octal

2019-03-23 Thread Eric V. Smith


Eric V. Smith  added the comment:

I agree that this is not a useful check.

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[issue36424] Pickle fails on frozen dataclass that has slots

2019-03-25 Thread Eric V. Smith


Change by Eric V. Smith :


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[issue36077] Inheritance dataclasses fields and default init statement

2019-02-22 Thread Eric V. Smith


Change by Eric V. Smith :


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[issue36077] Inheritance dataclasses fields and default init statement

2019-02-22 Thread Eric V. Smith


Eric V. Smith  added the comment:

I'm not keen on re-ordering parameters. Maybe it could be done if specified 
with a parameter to @dataclass.

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[issue34776] Postponed annotations break inspection of dataclasses

2019-03-05 Thread Eric V. Smith


Eric V. Smith  added the comment:

I'm finally getting time to look at this. I'll see what I can do.

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[issue36117] Allow rich comparisons for real-valued complex objects.

2019-02-26 Thread Eric V. Smith


Eric V. Smith  added the comment:

-1. We don't want to have objects that are orderable depending on their values. 
I can't think of anywhere else we do this.

It would be very easy to have a complex == 42+0.001j, after some 
calculation. This near-zero imaginary part would prevent it from being 
orderable, while if a similar calculation produced exactly 42+0j, then that 
instance would be orderable. An application relying on this would be a 
nightmare to write comprehensive tests for.

Whether something is orderable or not should depend solely on its type, not its 
value.

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[issue36070] Enclosing scope not visible from within list comprehension

2019-02-21 Thread Eric V. Smith


Eric V. Smith  added the comment:

I suspect Nathan is seeing this problem at class scope. This is a well known 
issue:

>>> class C:
...   from random import random
...   out = [random() for ind in range(3)]
...
Traceback (most recent call last):
  File "", line 1, in 
  File "", line 3, in C
  File "", line 3, in 
NameError: name 'random' is not defined
>>>

It is not related to the list comprehension, but to the class scope. See the 
last paragraph of 
https://docs.python.org/3/reference/executionmodel.html#resolution-of-names

But I agree with Zach about needing an example that fails.

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[issue33944] Deprecate and remove pth files

2019-03-07 Thread Eric V. Smith

Eric V. Smith  added the comment:

>> I should have to start that package somehow.
>
> `pip install` is a pretty good opt-in already imo

I think that’s where we disagree. Like others, I don’t want this to affect 
every python script in a given installation. 

>> Instead of just shipping "my_module.foo", you ship "my_module.py" and 
>> "_my_module.foo", where "my_module.py" looks like:
>
> but that's exactly my point, now you have to ship extra junk python files 
> when it's a way better experience to have the hooks _just work_


You mean extra junk like .pth files? I don’t see the difference between a .py 
file and a .pth file, except I can’t opt out of .pth files. 

We’re just looking for some way to control the behavior, without giving the 
.pth file unlimited capabilities before the user script starts. If it’s “just” 
some extra .py files, then maybe that’s great. If we need some other new 
mechanism, then I’d be okay with that, too.

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[issue36400] Add activate script to venv root folder

2019-03-22 Thread Eric V. Smith


Eric V. Smith  added the comment:

While I think this might have been a reasonable choice when this was first 
added, I think it's too late to change. We'd have to keep the files in bin (or 
Scripts) indefinitely because there are a zillion tutorials that talk about 
them. And having them in both places just leads to confusion.

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[issue35960] dataclasses.field does not preserve empty metadata object

2019-02-12 Thread Eric V. Smith


Eric V. Smith  added the comment:


New changeset b01786c8812c4cc24dd561b5941025bdd6f444c0 by Eric V. Smith 
(Christopher Hunt) in branch 'master':
 bpo-35960: Fix dataclasses.field throwing away empty metadata.  (GH-11815)
https://github.com/python/cpython/commit/b01786c8812c4cc24dd561b5941025bdd6f444c0


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[issue35960] dataclasses.field does not preserve empty metadata object

2019-02-12 Thread Eric V. Smith


Eric V. Smith  added the comment:


New changeset 0a834c18cdafa5447d4436878e64aa7a4e4dc817 by Eric V. Smith (Miss 
Islington (bot)) in branch '3.7':
bpo-35960: Fix dataclasses.field throwing away empty metadata.  (GH-11815) 
(GH-11826)
https://github.com/python/cpython/commit/0a834c18cdafa5447d4436878e64aa7a4e4dc817


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[issue35960] dataclasses.field does not preserve empty metadata object

2019-02-12 Thread Eric V. Smith


Eric V. Smith  added the comment:

Thanks for the patch!

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status: open -> closed

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[issue35960] dataclasses.field does not preserve empty metadata object

2019-02-11 Thread Eric V. Smith


Change by Eric V. Smith :


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[issue36592] is behave different for integers in 3.6 and 3.7

2019-04-10 Thread Eric V. Smith


Eric V. Smith  added the comment:

Python makes no guarantee as to whether an identity test on integers would 
return True or False. You should not depend on the behavior in any particular 
version.

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stage:  -> resolved
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type:  -> behavior

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[issue36580] unittest.mock does not understand dataclasses

2019-04-09 Thread Eric V. Smith


Eric V. Smith  added the comment:

I'm not sure why dataclasses would be different here:

>>> import dataclasses
>>> import unittest.mock
>>> @dataclasses.dataclass
... class Foo:
... name: str
... baz: float
... bar: int = 12
...
>>> import inspect
>>> inspect.signature(Foo)
 None>
>>>

Foo is just a normal class with a normal __init__.

This is no different than if you don't use dataclasses:

>>> class Bar:
... def __init__(self, name: str, baz: float, bar: int = 12) -> None:
... pass
...
>>> Bar()
Traceback (most recent call last):
  File "", line 1, in 
TypeError: __init__() missing 2 required positional arguments: 'name' and 'baz'
>>> inspect.signature(Bar)
 None>
>>> BarMock = unittest.mock.Mock(Bar)
>>> barMock = BarMock()

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[issue36608] Replace bundled pip and setuptools with a downloader in the ensurepip module

2019-04-12 Thread Eric V. Smith


Eric V. Smith  added the comment:

And I don't mean to sound like a total downer. I just think it's important that 
we recognize all of the use cases.

Thanks for your work on this.

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[issue36608] Replace bundled pip and setuptools with a downloader in the ensurepip module

2019-04-12 Thread Eric V. Smith


Eric V. Smith  added the comment:

ensurepip does not access the network, by design. We do not want it to start 
access the network without a lot of discussion.

And if it does access the network, it will need to be able to use alternate 
URLs. For example: where I deploy Python, it would not have access to the URLs 
in your PR, but instead would need to specify a different (internal) location. 
This is the same reason that pip install has --find-links, --no-index, 
--extra-index-url, etc.

I think this would need a lot of discussion (probably on distutils-sig), and 
probably a PEP.

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[issue36655] Division Precision Problem

2019-04-18 Thread Eric V. Smith


Eric V. Smith  added the comment:

Also see https://docs.python.org/3/tutorial/floatingpoint.html for some 
Python-specific details.

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[issue36622] Inconsistent exponent notation formatting

2019-04-12 Thread Eric V. Smith


Change by Eric V. Smith :


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[issue37065] File and lineno is not reported for syntax error in f-string

2019-05-27 Thread Eric V. Smith


Eric V. Smith  added the comment:

I'm pretty sure there's already an issue for this, but I don't have time to 
search for it now.

This is not an easy problem to solve. I've been working on it on and off for 
almost a year. I'll eventually get to it, but the changes are pretty invasive.

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[issue37070] Clean up f-string debug handling, including potential memory leaks

2019-05-27 Thread Eric V. Smith


New submission from Eric V. Smith :

This addresses a few issues Serhiy found in the review for issue 37050 at 
https://github.com/python/cpython/pull/13597. Patch to follow.

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components: Interpreter Core
messages: 343722
nosy: eric.smith, serhiy.storchaka
priority: normal
severity: normal
status: open
title: Clean up f-string debug handling, including potential memory leaks
type: behavior
versions: Python 3.8

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[issue37050] Remove expr_text from ast node FormattedValue

2019-05-27 Thread Eric V. Smith


Change by Eric V. Smith :


--
keywords: +patch
pull_requests: +13504
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/13597

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[issue37068] Emit SyntaxWarning for f-strings without expressions ?

2019-05-27 Thread Eric V. Smith


Eric V. Smith  added the comment:

I think this would be better suited for a linter.

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[issue37050] Remove expr_text from ast node FormattedValue

2019-05-27 Thread Eric V. Smith


Eric V. Smith  added the comment:


New changeset 6f6ff8a56518a80da406aad6ac8364c046cc7f18 by Eric V. Smith in 
branch 'master':
bpo-37050: Remove expr_text from FormattedValue ast node, use Constant node 
instead (GH-13597)
https://github.com/python/cpython/commit/6f6ff8a56518a80da406aad6ac8364c046cc7f18


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[issue37050] Remove expr_text from ast node FormattedValue

2019-05-27 Thread Eric V. Smith


Change by Eric V. Smith :


--
priority: release blocker -> 
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
type:  -> behavior

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[issue37003] ast unparse does not support f-string new debug format.

2019-05-27 Thread Eric V. Smith


Eric V. Smith  added the comment:

mbussonn: can you re-check this in light of the changes for issue37050? I'm not 
sure if there's still a problem that needs fixing or not.

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[issue37070] Clean up f-string debug handling, including potential memory leaks

2019-05-27 Thread Eric V. Smith


Change by Eric V. Smith :


--
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pull_requests: +13513
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/13607

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[issue37050] Remove expr_text from ast node FormattedValue

2019-05-25 Thread Eric V. Smith


New submission from Eric V. Smith :

I added the expr_text optional field to the FormattedValue node in order to 
implement the '=' feature of f-strings (see issue 36817).

However, the expr_text field isn't strictly needed. Instead, the same feature 
could be added with another Constant string node child of the JoinedStr node.

I'm going to remove expr_text and use another Constant in order to remove this 
change to the 3.8 ast nodes. I have a patch mostly worked out, I'll have it 
ready in the next day or two. I want to get this in to 3.8 beta 1, because 
otherwise we're stuck with the expr_text implementation.

--
assignee: eric.smith
components: Interpreter Core
messages: 343511
nosy: eric.smith, lukasz.langa
priority: release blocker
severity: normal
stage: needs patch
status: open
title: Remove expr_text from ast node FormattedValue
versions: Python 3.8

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[issue37061] The strangest glitch I have ever seen - incorrect indenterror, even on commented out code.

2019-05-26 Thread Eric V. Smith


Eric V. Smith  added the comment:

Line 41 is indented 4 spaces past line 38, but should not be.

You'd be better served by first asking questions like this on the python-list 
mailing list.

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stage:  -> resolved
status: open -> closed

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[issue35761] Allow dataclasses to be updated in place

2019-06-02 Thread Eric V. Smith


Eric V. Smith  added the comment:

I'm going to reject this. There's nothing special about dataclasses that would 
require a feature like this.

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[issue33569] dataclasses InitVar does not maintain any type info

2019-06-02 Thread Eric V. Smith


Eric V. Smith  added the comment:

Thanks for the PR!

--
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status: open -> closed
type:  -> behavior

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[issue33569] dataclasses InitVar does not maintain any type info

2019-06-02 Thread Eric V. Smith


Eric V. Smith  added the comment:


New changeset 01ee12ba35a333e8a6a25c4153c4a21838e9585c by Eric V. Smith 
(Augusto Hack) in branch 'master':
bpo-33569 Preserve type information with dataclasses.InitVar (GH-8927)
https://github.com/python/cpython/commit/01ee12ba35a333e8a6a25c4153c4a21838e9585c


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[issue37163] dataclasses.replace() fails with the field named "obj"

2019-06-05 Thread Eric V. Smith


Eric V. Smith  added the comment:

Possibly a use for positional-only parameters. Backward compatibility is the 
question, of course.

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[issue37106] python re.escape doesn't escape some special characters.

2019-05-31 Thread Eric V. Smith


Eric V. Smith  added the comment:

Could you show a problem caused by the characters that are unescaped? I assume 
you're talking about the ` and ' characters, since that's what your example 
shows. But those aren't listed as "special characters" 
(https://docs.python.org/3.5/library/re.html#regular-expression-syntax), so I'm 
not sure what problem would be caused by them being unescaped.

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stage:  -> test needed

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[issue37106] python re.escape doesn't escape some special characters.

2019-05-31 Thread Eric V. Smith


Eric V. Smith  added the comment:

re.escape() is designed to only escape characters that have special meaning in 
regular expressions. It is not a general purpose escaping mechanism, and it is 
especially dangerous to use it for building SQL statements.

You should be using parameterized SQL queries. See 
https://en.wikipedia.org/wiki/SQL_injection and for example 
https://stackoverflow.com/questions/162/how-to-put-parameterized-sql-query-into-variable-and-then-execute-in-python

In any event, it seems that re.escape() is working as designed, so I'm going to 
close this.

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status: open -> closed

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[issue37103] Undo deprecation of optparse

2019-05-30 Thread Eric V. Smith


Change by Eric V. Smith :


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[issue37113] 'ß'.upper() should return 'ẞ'

2019-05-31 Thread Eric V. Smith

Eric V. Smith  added the comment:

See http://unicode.org/faq/casemap_charprop.html, search for "Why does ß 
(U+00DF LATIN SMALL LETTER SHARP S) not uppercase to U+1E9E LATIN CAPITAL 
LETTER SHARP S by default?"

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[issue37184] suggesting option to raise exception if process exits nonzero in `with subprocess.Popen(...):`

2019-06-06 Thread Eric V. Smith


Eric V. Smith  added the comment:

I think Popen() is just about as complex as anyone wants it to be. Is there 
something about .run() or .check_call() that keeps you from using them?

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versions: +Python 3.9

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[issue37184] suggesting option to raise exception if process exits nonzero in `with subprocess.Popen(...):`

2019-06-06 Thread Eric V. Smith


Eric V. Smith  added the comment:

I figured as much (but didn't want to lead the witness!).

I'm not completely opposed to this. I think the best thing to do is to bring up 
the proposal on python-ideas, and point here.

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[issue37070] Clean up f-string debug handling, including potential memory leaks

2019-05-29 Thread Eric V. Smith


Change by Eric V. Smith :


--
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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[issue37070] Clean up f-string debug handling, including potential memory leaks

2019-05-29 Thread Eric V. Smith


Eric V. Smith  added the comment:


New changeset f83d1dbd3bfbde940117c85f5c70de00e47b7e6e by Eric V. Smith in 
branch 'master':
bpo-37070: Cleanup fstring debug handling (GH-13607)
https://github.com/python/cpython/commit/f83d1dbd3bfbde940117c85f5c70de00e47b7e6e


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[issue37086] time.sleep error message misleading

2019-05-29 Thread Eric V. Smith


Eric V. Smith  added the comment:

I think it's reasonable to change the TypeError to say integer or float. That's 
what _PyTime_FromObject is looking for.

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[issue37170] Wrong return value from PyLong_AsUnsignedLongLongMask on PyErr_BadInternalCall

2019-06-06 Thread Eric V. Smith


Eric V. Smith  added the comment:

As ztane says, the issue isn't the -1, it's the type of the cast. This looks 
like a legitimate issue to me.

--
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resolution: not a bug -> 
stage: resolved -> patch review
status: closed -> open

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