[MRG] MNT Ignore E731: Use a def instead of lambda #8131
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We don't follow this and lambdas are quite common in the scientific programming world. Our contributors will more often use lambdas compared to diff for one-liners...
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I'd rather a def. I think people write lambdas thinking it's doing
something different. They're wrong. Defs provide a name in the traceback.
…On 29 December 2016 at 08:05, (Venkat) Raghav (Rajagopalan) < ***@***.***> wrote:
Our flake8 checker in travis raises error for lambdas for one-liners. I
don't think we follow that. Most contributors might prefer lambdas
actually...
Ref lambda check_df = lambda x: isinstance(x, InputFeatureType)
<https://github.com/scikit-learn/scikit-learn/pull/5697/files#diff-d51a9726ff1d2791c05babac47e936d5R984>
@GaelVaroquaux <https://github.com/GaelVaroquaux> @jnothman
<https://github.com/jnothman> Is this fine with you?
------------------------------
You can view, comment on, or merge this pull request online at:
#8131
Commit Summary
- MNT Ignore E731: Use a def instead of lambda
File Changes
- *M* build_tools/travis/flake8_diff.sh
<https://github.com/scikit-learn/scikit-learn/pull/8131/files#diff-0>
(4)
Patch Links:
- https://github.com/scikit-learn/scikit-learn/pull/8131.patch
- https://github.com/scikit-learn/scikit-learn/pull/8131.diff
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In tests I might make an exception.
…On 29 December 2016 at 13:43, Joel Nothman ***@***.***> wrote:
I'd rather a def. I think people write lambdas thinking it's doing
something different. They're wrong. Defs provide a name in the traceback.
On 29 December 2016 at 08:05, (Venkat) Raghav (Rajagopalan) <
***@***.***> wrote:
> Our flake8 checker in travis raises error for lambdas for one-liners. I
> don't think we follow that. Most contributors might prefer lambdas
> actually...
>
> Ref lambda check_df = lambda x: isinstance(x, InputFeatureType)
> <https://github.com/scikit-learn/scikit-learn/pull/5697/files#diff-d51a9726ff1d2791c05babac47e936d5R984>
>
> @GaelVaroquaux <https://github.com/GaelVaroquaux> @jnothman
> <https://github.com/jnothman> Is this fine with you?
> ------------------------------
> You can view, comment on, or merge this pull request online at:
>
> #8131
> Commit Summary
>
> - MNT Ignore E731: Use a def instead of lambda
>
> File Changes
>
> - *M* build_tools/travis/flake8_diff.sh
> <https://github.com/scikit-learn/scikit-learn/pull/8131/files#diff-0>
> (4)
>
> Patch Links:
>
> - https://github.com/scikit-learn/scikit-learn/pull/8131.patch
> - https://github.com/scikit-learn/scikit-learn/pull/8131.diff
>
> —
> You are receiving this because you were mentioned.
> Reply to this email directly, view it on GitHub
> <#8131>, or mute the
> thread
> <https://github.com/notifications/unsubscribe-auth/AAEz688hs4q9nckh3Iq7bwejPkRRL7Aaks5rMs78gaJpZM4LXMBs>
> .
>
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Rather, as local closures, usually in tests, I might make an exception.
…On 29 December 2016 at 13:47, Joel Nothman ***@***.***> wrote:
In tests I might make an exception.
On 29 December 2016 at 13:43, Joel Nothman ***@***.***> wrote:
> I'd rather a def. I think people write lambdas thinking it's doing
> something different. They're wrong. Defs provide a name in the traceback.
>
> On 29 December 2016 at 08:05, (Venkat) Raghav (Rajagopalan) <
> ***@***.***> wrote:
>
>> Our flake8 checker in travis raises error for lambdas for one-liners. I
>> don't think we follow that. Most contributors might prefer lambdas
>> actually...
>>
>> Ref lambda check_df = lambda x: isinstance(x, InputFeatureType)
>> <https://github.com/scikit-learn/scikit-learn/pull/5697/files#diff-d51a9726ff1d2791c05babac47e936d5R984>
>>
>> @GaelVaroquaux <https://github.com/GaelVaroquaux> @jnothman
>> <https://github.com/jnothman> Is this fine with you?
>> ------------------------------
>> You can view, comment on, or merge this pull request online at:
>>
>> #8131
>> Commit Summary
>>
>> - MNT Ignore E731: Use a def instead of lambda
>>
>> File Changes
>>
>> - *M* build_tools/travis/flake8_diff.sh
>> <https://github.com/scikit-learn/scikit-learn/pull/8131/files#diff-0>
>> (4)
>>
>> Patch Links:
>>
>> - https://github.com/scikit-learn/scikit-learn/pull/8131.patch
>> - https://github.com/scikit-learn/scikit-learn/pull/8131.diff
>>
>> —
>> You are receiving this because you were mentioned.
>> Reply to this email directly, view it on GitHub
>> <#8131>, or mute the
>> thread
>> <https://github.com/notifications/unsubscribe-auth/AAEz688hs4q9nckh3Iq7bwejPkRRL7Aaks5rMs78gaJpZM4LXMBs>
>> .
>>
>
>
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Okay thanks for the clarification. Now that we have that preference documented here in this PR, I'll close it... ;) |
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I'd rather a def. I think people write lambdas thinking it's doing
something different. They're wrong. Defs provide a name in the traceback.
I agree. In general lambdas are to be avoided. But there are cases where
they are just much more concise.
The question of whether adding a lambda should raise an error in tests is
open. To me, these are things that should be caught in reviews, and we
should strive for having CI always green. I tend to strongly dislike
merging PRs with failing tests, as it opens the door to human error.
That just reminds me how little love I have for the pep8 tool, which is
an overly strict interpretation of the book (and was criticized as so by
Guido and hence has been renamed to "pycodestyle"
PyCQA/pycodestyle#466).
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Our flake8 checker in travis raises error for lambdas for one-liners. I don't think we follow that. Most contributors might prefer lambdas actually...
Ref
lambda check_df = lambda x: isinstance(x, InputFeatureType)@GaelVaroquaux @jnothman @ogrisel Is this fine with you?