pep8 Re: Posting warning message

[Cameron Simpson]

On 14Jun2018 02:35, Tamara Berger <brgrt2 at gmail.com> wrote:
>On Thu, Jun 14, 2018 at 1:49 AM Cameron Simpson <cs at cskk.id.au> wrote:
>> Just as you can run your code before you install it, you can lint your code
>> beforehand also. In fact, you should be doing both: run and test the code
>> _before_ installing it, and also lint it (when you care) and test again
>> (because if you made lint changes you want to check they haven't done something
>> unwanted).
>
>Great. So I'm using three interfaces: in my case, the text editor, the
>Python shell, and the UNIX terminal. Is that right?

Possibly; I thought you were using IDLE, which is a GUI with a simple editor 
and a Python interpreter built in?

My setup tends to be a terminal with an editor in it, and another terminal with 
a UNIX shell in it. And sometimes the Python shell in the UNIX shell in the 
terminal when I'm testing something simple. For example:

  [~/hg/css(hg:default)]fleet*> python3
  + exec /Users/cameron/var/venv/3/bin/python3
  Python 3.6.5 (default, Mar 29 2018, 15:38:28)
  [GCC 4.2.1 Compatible Apple LLVM 7.3.0 (clang-703.0.31)] on darwin
  Type "help", "copyright", "credits" or "license" for more information.
  >>>

That's a python 3 shell run from the UNIX shell in a terminal. The 
"[~/hg/css(hg:default)]fleet*>" is my UNIX shell prompt, with my working 
directory, VCS branch and hostname. So "~/hg/css" is where I'm working, 
separate from where the code gets installed. For testing I run the local code, 
which might be arbitrarily bad. I don't do the "install" step until it seems 
fairly good.

Of course, the UNIX shell is there to run whatever I like. So to lint one of my 
Python files I might do this:

  [~/hg/css(hg:default)]fleet*> lint cs/sh.py
  + exec lint cs/sh.py
  + exec python3 -m py_compile cs/sh.py
  + exec /Users/cameron/var/venv/3/bin/python3 -m py_compile cs/sh.py
  + exec pyflakes cs/sh.py
  + exec pep8 --ignore=E111,E114,E124,E126,E201,E202,E221,E226,E227,E265,E266,E301,E302,E501,E731,W503 cs/sh.py
  + exec pylint --rcfile=/Users/cameron/.pylintrc --disable=bad-whitespace,invalid-name cs/sh.py
  Using config file /Users/cameron/.pylintrc
  ************* Module python.cs.sh
  W:105, 2: Using possibly undefined loop variable 'offset' 
  (undefined-loop-variable)

  ------------------------------------------------------------------
  Your code has been rated at 9.85/10 (previous run: 9.85/10, +0.00)

You can see my lint script doing:

  - test compile the script (no need to bother with the rest if that fails)
  - run pyflakes on it
  - run pep8 on it
  - run pylint on it

Cheers,
Cameron Simpson <cs at cskk.id.au>