Request: Don't show PEP8 errors for tables of data

[endolith]

Issue Report Checklist

• Searched the issues page for similar reports
• Read the relevant sections of the Spyder Troubleshooting Guide and followed its advice
• Reproduced the issue after updating with conda update spyder (or pip, if not using Anaconda)
• Could not reproduce inside jupyter qtconsole (if console-related)
• Tried basic troubleshooting (if a bug/error)
  • Restarted Spyder
  • Reset preferences with spyder --reset
  • Reinstalled the latest version of Anaconda
  • Tried the other applicable steps from the Troubleshooting Guide
• Completed the Problem Description, Steps to Reproduce and Version sections below

Problem Description

Spyder with "Real-time code style analysis" turned on shows code style errors for tables of numbers that are formatted in a neat, readable way:

which encourages re-formatting them in a less readable way (which is contrary to the intent of PEP8):

These examples are from SciPy, for example. I asked if this exception could be added to the pycodestyle/pep8 library itself, but they will not add it. They say to use flake8 instead and modify its rules. It would be nice if something like this could be done in Spyder.

What steps reproduce the problem?

1. Turn on real-time code style analysis
2. Copy a numpy array from the interpreter to the code editor pane
3. Save the file

What is the expected output? What do you see instead?

It shows code style problems for code that is more-readable, and does not show them for code that is less readable.

Versions

• Spyder version: 3.3.5
• Python version: 3.7.3 64-bit
• Qt version: 5.9.6
• PyQt version: 5.9.2
• Operating System name/version: Windows 7 Pro 64-bit

Dependencies

IPython >=4.0     :  7.6.1 (OK)
cython >=0.21     :  0.29.12 (OK)
jedi >=0.9.0      :  0.13.3 (OK)
matplotlib >=2.0.0:  3.0.3 (OK)
nbconvert >=4.0   :  5.5.0 (OK)
numpy >=1.7       :  1.16.2 (OK)
pandas >=0.13.1   :  0.24.2 (OK)
pycodestyle >=2.3 :  2.5.0 (OK)
pyflakes >=0.6.0  :  2.1.1 (OK)
pygments >=2.0    :  2.4.2 (OK)
pylint >=0.25     :  2.3.1 (OK)
qtconsole >=4.2.0 :  4.5.1 (OK)
rope >=0.9.4      :  0.14.0 (OK)
sphinx >=0.6.6    :  2.1.2 (OK)
sympy >=0.7.3     :  1.4 (OK)

[ccordoba12]

Thanks for reporting. You'll be able to select what pep8 message you want to see/hide in Spyder 4.

[endolith]

Will it just block all of a particular error though? Because they are useful everywhere else except tables of data

[goanpeca]

Will it just block all of a particular error though? Because they are useful everywhere else except tables of data

all of a particular error

Yes

Because they are useful everywhere else except tables of data

This should be probably implemented on the linter side and not on spyder.

[endolith]

@goanpeca I asked pycodestyle and they said it's downstream's responsibility. :/

[ccordoba12]

@goanpeca, how do you think we could address this one? Probably with a regex that detects nested lists of data?

[goanpeca]

@goanpeca, how do you think we could address this one?

Not sure how we can handle this :-|