[code-quality] Fwd: The doc demo have some problems

[Skip Montanaro]

The appended email crossed the transom at webmaster at python.org today.
Apologies for the hot mess Gmail makes of forwarded emails.

I wonder if it makes sense to warn about misspelled dunder names. I tried
pylinting (1.1.0, sorry, it's what I have here at work) and flake8ing (2.0)
this:

class Foo(object):
    def __init_(self):
        self.x = 0

    def _add_(self, other):
        return self.x + other.x

Pylint complained about attribute x not being defined in __init__, but
that's a rather indirect message. It failed to say anything about _add_.
Flake8 said nothing.

Is this a common enough problem that these sort of tools should warn about
mistakes in the leading/trailing underscore count of otherwise dunder
attributes?

Skip

---------- Forwarded message ----------
From: protestmailself <protestmailself at gmail.com>
Date: Fri, Nov 21, 2014 at 1:56 AM
Subject: Re: The doc demo have some problems
To: webmaster <webmaster at python.org>


Hi:

     I make a mistake using
       _init_  not the __init__

------------------------------
protestmailself


*From:* protestmailself <protestmailself at gmail.com>
*Date:* 2014-11-21 15:30
*To:* webmaster <webmaster at python.org>
*Subject:* The doc demo have some problems
 Hi:

    I using the code at location: [
https://docs.python.org/2/tutorial/classes.html] using python 2.7.8
      class Complex:

def _init_(self, realpart, imagpart):

self.r = realpart

self.i = imagpart

      x = Complex(3.0, -4.5)
      x.r, x.i

     I got the error: TypeError: this constructor takes no arguments
     i think this is a mistake as the demo not define a constructor, but
use a constructor with two arguments.
     Change to this can be passed.
      class Complex:

r = 0

i = 0

def _init_(self, realpart, imagpart):

self.r = realpart

self.i = imagpart

    x = Complex()

    x._init_(3.0, -4.5)
      x.r, x.i


  Best regards
------------------------------
protestmailself
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