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Added support for keyword-only arguments on Python 3+ [rebase] #411

Merged
merged 14 commits into from
Aug 11, 2018
Merged

Added support for keyword-only arguments on Python 3+ [rebase] #411

merged 14 commits into from
Aug 11, 2018

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asford
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@asford asford commented Jul 24, 2018 •
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This is a rebase-and-extension of pull #281. @malinoff (& @hynek), I'm happy to handle this as a sub-pull of that request or merge independently.

Closes #335, closes #106, closes #38.

Pull Request Check List

This is just a reminder about the most common mistakes. Please make sure that you tick all appropriate boxes. But please read our contribution guide at least once, it will save you unnecessary review cycles!

  • Added tests for changed code.
  • New features have been added to our Hypothesis testing strategy.
  • Changes or additions to public APIs are reflected in our type stubs (files ending in .pyi).
  • Updated documentation for changed code.
  • Documentation in .rst files is written using semantic newlines.
  • Changed/added classes/methods/functions have appropriate versionadded, versionchanged, or deprecated directives.
  • Changes (and possible deprecations) have news fragments in changelog.d.

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@asford asford changed the title Issue 106 Added support for keyword-only arguments on Python 3+ [rebase] Jul 24, 2018
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asford commented Jul 24, 2018

@hynek I think this extends #281 to resolve the feedback you provided in that review. Would you mind taking a look at this implementation?

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hynek commented Jul 24, 2018

Thanks for reviving this! I’ll be at EuroPython for the rest of the week but will take a look once I have the time. You’ve Got a typo in the stubs btw: kw_onlly or something like that (on phone sorry).

Other reviewers are invited to pick up my slack of course. ;)

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asford commented Jul 24, 2018

Great, thanks! Before I start covering my tracks, is --force push ok for fixups in PRs in this repo?

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hynek commented Jul 24, 2018

It’s your repo, do whatever the hell pleases you. We’ll squash at the end anyway.

@asford
Add attr.s-level kw_only flag.
8c14ff0 
Add `kw_only` flag to `attr.s` decorator, indicating that all class
attributes should be keyword-only in __init__.

Minor updates to internal interface of `Attribute` to support
evolution of attributes to `kw_only` in class factory.

Expand examples with `attr.s` level kw_only.
@asford
Add kw_only to type stubs.
69ad3aa
@asford
Update changelog for rebased PR.
117b81e 
Hear ye, hear ye. A duplicate PR is born.
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asford commented Jul 24, 2018

Fixed .pyi typo and delinted; ready for review at everyone's convenience.

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Overall this looks pretty good! I have a bunch of minor things and one major question. :)

docs/examples.rst Outdated
>>> A(a=1)
A(a=1)

`kw_only` may also be specified at via ``attr.s``, and will apply to all attributes:

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docs/examples.rst Outdated



If you create an attribute with ``init=False``, ``kw_only`` argument is simply ignored.

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docs/examples.rst Outdated
...
TypeError: B() missing 1 required keyword-only argument: 'b'

If you omit ``kw_only`` or specify ``kw_only=False``, then you'll get an error:

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src/attr/_make.py
@@ -206,6 +212,7 @@ def attrib(
converter=converter,
metadata=metadata,
type=type,
kw_only=kw_only,

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src/attr/_make.py Outdated
@@ -736,6 +760,10 @@ def attrs(
Attributes annotated as :data:`typing.ClassVar` are **ignored**.

.. _`PEP 526`: https://www.python.org/dev/peps/pep-0526/
:param bool kw_only: Make all attributes keyword-only (Python 3+)
in the generated ``__init__`` (if ``init`` is ``False``, this
parameter is simply ignored).

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tests/test_make.py
x = attr.ib(default=None)
y = attr.ib()

attrs, super_attrs, _ = _transform_attrs(C, None, False, True)

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tests/test_make.py
x = attr.ib(init=False, default=0, kw_only=True)
y = attr.ib()

c = C(1)

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tests/test_make.py
y = attr.ib()

with pytest.raises(ValueError) as e:
_transform_attrs(C, None, False, False)

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tests/test_make.py
with pytest.raises(TypeError):
C(0, y=1)

c = C(x=0, y=1)

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tests/test_make.py
with pytest.raises(TypeError):
C(1)

c = C(x=0, y=1)

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@hynek hynek added this to the 18.2 milestone Jul 28, 2018
hynek
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We’re getting there!

src/attr/_make.py Outdated
@@ -1558,6 +1613,17 @@ def from_counting_attr(cls, name, ca, type=None):
**inst_dict
)

# Don't use attr.evolve since fields(Attribute) doesn't work
def _evolve(self, **changes):

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src/attr/_make.py
if kw_only_args:
if PY2:
raise PythonTooOldError(
"Keyword-only arguments only work on Python 3 and later."

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src/attr/exceptions.py

class PythonTooOldError(RuntimeError):
"""
An ``attrs`` feature requiring a more recent python version has been used.

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tests/test_make.py
@attr.s(kw_only=True)
class ClassLevel(object):
a = attr.ib()

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tests/test_make.py
@attr.s()
class AttrLevel(object):
a = attr.ib(kw_only=True)

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@hynek hynek merged commit 123df67 into python-attrs:master Aug 11, 2018
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hynek commented Aug 11, 2018

Thanks everyone!

@hynek hynek mentioned this pull request Aug 11, 2018
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this is awesome! thanks @asford for pushing this through!

@benbovy benbovy mentioned this pull request Aug 29, 2018
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@asford @hynek @wbolster @malinoff