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6.1.2 Be Careful With Model Inheritance

Model inheritance in Django is a tricky subject. Django provides three ways to do model inheritance: abstract base classes, multi-table inheritance, and proxy models.

Warning

Django Abstract Base Classes ≠ Python Abstract Base Classes
Don’t confuse Django abstract base classes with the abstract base classes in the Python standard library’s abc module, as they have very different purposes and behaviors.

Here are the pros and cons of the three model inheritance styles. To give a complete comparison, we also include the option of using no model inheritance to begin with:

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#!/usr/bin/env python3

"""
Read a CSV file from stdin and write a fixed CSV file to stdout.

Example:
    $ cat zenhub.csv | ./fix-zenhub-csv.py > fixed.csv
    $ fix-zenhub-csv.py zenhub.csv > fixed.csv
"""

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# We first create a spreadsheet with the ZenHub Pipeline and GitHub Project Column mapping
# Then, we moved all the issues manually into an "Unsorted" column in our GitHub Project
# Read through each of the issues that is in the Unsorted column and move them to the correct column
# if it's in the spreadsheet.

# To run:
# pip install python-dotenv ghzh-clients

import csv
import os

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<!-- OctoLinker Enabled -->
<tr>
  <td id="L4" class="blob-num js-line-number" data-line-number="4"></td>
  <td id="LC4" class="blob-code blob-code-inner js-file-line highlighted">
    <span class="pl-k">from</span>
    <a data-pjax="true" class="octolinker-link" href="https://www.djangoproject.com">
      <span class="pl-s1">django</span>.
      <span class="pl-s1">apps</span>
      <span class="pl-s1">
		<span class="pl-token" data-hydro-click="{&quot;event_type&quot;:&quot;code_navigation.click_on_symbol&quot;,&quot;payload&quot;:{&quot;action&quot;:&quot;click_on_symbol&quot;,&quot;repository_id&quot;:4164482,&quot;ref&quot;:&quot;a9a7421ab83361746549d574ca13438ba93c95fe&quot;,&quot;language&quot;:&quot;Python&quot;,&quot;originating_url&quot;:&quot;https://github.com/django/django/blob/a9a7421ab83361746549d574ca13438ba93c95fe/django/contrib/auth/checks.py&quot;,&quot;user_id&quot;:85895}}" data-hydro-click-hmac="a987f9b6fad47553f0ed81d9247442e2c673144f316ce4e8b99e506dae4ab0f5">apps</span>

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'''
put this in $PROJECT/.tmp/home/.config/ptpython/config.py
'''

from __future__ import unicode_literals

from prompt_toolkit.keys import Keys
from ptpython.layout import CompletionVisualisation

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Debugging info for https://lichess.org/forum/lichess-feedback/stockfish-wasm-engine-never-loads

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Redirect To File Download

To use this, replace all of the placeholder content in 01.template.html with the actual file path and name.

Then save the resulting html file as index.html to be used as the S3 bucket index as well as the error page for redirects.

Example

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# shellcheck shell=bash disable=SC2164,SC1117
# ~/.bashrc: executed by bash(1) for non-login shells.

# Note: PS1 and umask are already set in /etc/profile. You should not
# need this unless you want different defaults for root.
# PS1='${debian_chroot:+($debian_chroot)}\h:\w\$ '
# umask 022

export TERM='xterm-256color'

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FROM python:3.7

# Install the dependencies for R
RUN apt-get update && apt-get install -y r-base r-base-dev r-recommended

# Add all of the scripts to the /opt/app/ path inside of the image
ADD . /opt/app/

# Change the working directory inside of the image to /opt/app/
WORKDIR /opt/app/