Python 3 - To Be a Python Full Stack Developer

By Sheldon L

Published at 2019-11-22

Updated at 2019-11-29

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Framework

• Django

• Flask

• React

• Angular

Environment

By pipenv

pip install pipenv

# To remove pipenv
# in the root of the env file (always have a Pipfile in it)
# the prompt should be: `(env_name)name@host:~/..$`

# to remove
pipenv --rm
rm Pipfil*
rm -rf <Project>

By venv

python3 -m venv venv
venv/bin/activate

By Conda

# create and activate environment
conda search "^python$"
conda create --name dj_py38 python=3.8
source activate dj_py38

# check environment
python --virsion
conda info --envs

Set Proxy

• Socks proxy dependencies:

export all_proxy=""
pip install pysocks
export all_proxy="socks5://127.0.0.1:1080"

IDE

By VSCode

By Pycharm (Recomended)

• install Pycharm Pro.
• set envs in settings.
• install .ignore plugin and create .gitignore in settings.

Database

• sqlite
• mysql
• oracal
• PostgreSQL

UI

Templates

Meterializecss

Online Test

codepen

Deployment

PythonAnywhere

• Open PythonAnywhere Console;

python3 --version
mkvirtualenv django3 --python=/usr/bin/python3.7
workon django3
pip install django
python3 -m django --version

• build my own application

cd ~/djProjects
django-admin startproject mysite
vim ~/djProjects/mysite/mysite/settings.py
"""/ upate ALLOWED_HOSTS
ALLOWED_HOSTS = ['*']
"""

cd ~/djProjects/mysite
python manage.py check

• open my own web app
  • go to web tab
  • add a new web application, manually, get settings done
    • Source code: /home/SheldonLee/djProjects/mysite
    • Working directory: /home/SheldonLee/djProjects/mysite
    • Virtualenv: /home/SheldonLee/.virtualenvs/django3
  • edit /var/www/..._..._..._com_wsgi.py like this:

  import os
  import sys
  
  path = os.path.expanduser('~/djProjects/mysite')
  if path not in sys.path:
      sys.path.insert(0, path)
  os.environ['DJANGO_SETTINGS_MODULE'] = 'mysite.settings'
  from django.core.wsgi import get_wsgi_application
  from django.contrib.staticfiles.handlers import StaticFilesHandler
  application = StaticFilesHandler(get_wsgi_application())
  

  • click reload ....pythonanywhere.com

  • click my url sheldonlee.pythonanywhere.com

• syncro PythonAnywhere to github

cd ~/djProjects
git init

# after create an empty ropo on github:
git remote add origin git@github.com:sheldonldev/djProjects_onPyAnyw.git
git add .
git commit -a

ssh-keygen -t rsa -C my_email@domain.com
cat ~/.ssh/id_rsa.pub

git push --set-upstream origin master

• syncro github to local laptop

cd $hub/mysite_test
git clone git@github.com:sheldonldev/djProjects_onPyAnyw.git

• setup in local laptop
  • start a virtural env the same as PythonAnywhere

  export all_proxy=socks5://127.0.0.1:1080
  conda create --name dj_py37 python=3.7
  conda activate dj_py37
  
  export all_proxy=""
  pip install pysocks
  export all_proxy=socks5://127.0.0.1:1080
  pip install django
  

  • set IDE in pyCharm:
    • set interpreter to dj_py37;
    • enable django support in language and framework;
    • rightclick root dir, New - .ignor file - .gitignore;
• syncro local laptop to github

pip freeze -> requirements.txt
git add .
git commit -a
git push

• syncro github to PythonAnywhere

  cd ~/djProject
  git pull
  
  workon django3
  pip install requirements.txt
  

  • If you edit two places and push from one of the places, the push will work - but the push won’t work from the second place and pull won’t work either becausee you have local changes. If this is what you did, there is a simple workaround. On the system where you have un-pushed changes and want to do a pull before pushing, do this:

  git stash
  git pull
  git stash apply
  

Heroku & pgAdmin (not usable in GFW)

• PostgreSQL packages for Debian and Ubuntu

  sudo apt-get install curl ca-certificates gnupg
  curl https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
  
  sudo sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt/ $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list'
  
  sudo apt-get update
  sudo apt install postgresql-common
  sudo sh /usr/share/postgresql-common/pgdg/apt.postgresql.org.sh
  
  # uninstall
  sudo apt-get -y purge postgresql-client-common pgadmin4
  

• OR Install PgAdmin4 in a virtual env, and install postgresql in UBUNTU (Recommended)

  # install
  build-essential libssl-dev libffi-dev libgmp3-dev
  virtualenv python-pip libpq-dev python-dev
  # for install psycopg2 later
  sudo apt-get install libpq-dev
  
  # download package from https://www.postgresql.org/ftp/pgadmin/pgadmin4/v4.15/pip/
  
  # use a virtual python env to install
  pip install pgadmin4-2.1-py2.py3-none-any.whl
  
  # create and edit `config_local.py`
  touch <env>/lib/python3.7/site-packets/pgadmin4/config_local.py
  vim <env>/lib/python3.7/site-packets/pgadmin4/config_local.py
  
  # add following content:
  """
  import os
  DATA_DIR = os.path.realpath(os.path.expanduser(u'~/.pgadmin/'))
  LOG_FILE = os.path.join(DATA_DIR, 'pgadmin4.log')
  SQLITE_PATH = os.path.join(DATA_DIR, 'pgadmin4.db')
  SESSION_DB_PATH = os.path.join(DATA_DIR, 'sessions')
  STORAGE_DIR = os.path.join(DATA_DIR, 'storage')
  SERVER_MODE = False
  """
  
  # then
  pip install psycopg2  # or conda install
  python <env>/lib/python<version>/site-packages/pgadmin4/pgAdmin4.py
  # install any moduel need to be imported
  # see 127.0.0.1:5050, PGADMIN INSTALLATION DONE!
  
  # install postgres package for PostgreSQL and contrib package for taking additional functionalities related to PostgreSQL
  sudo apt-GET install postgresql postgresql-contrib
  
  # create the username and password for PostgreSQL database
  sudo -u postgres psql postgres
  
  """ in postgres
  # \password postgres
  
  <--! to quit -->
  # \q
  """
  

• How to Deploy a Django App to Heroku in 2018… The Easy Way

  pip install gunicorn
  pip install django-heroku
  
  # no need in virtual env
  sudo snap install heroku --classic
  
  pip freeze > requirements.txt
  
  # create a heroku account
  # set ssh key
  # check API key
  
  # login to your heroku
  heroku login
  # create new app if one doesn't yet exist
  heroku create
  # log in to the app in heroku to set other stuff
  
  # create a new postgres database for your app
  heroku addons:create heroku-postgresql:hobby-dev
    
  git add .
  git commit -m "Ready to heroku this sucker in the face."
  git push origen master
  
  # migrate your database to the heroku app
  python manage.py makemigrations
  python manage.py migrate
  
  # before you do this, make sure to add your SECRET_KEY to your env variables in your heroku app settings
  git add .
  git commit -m "Ready to heroku this sucker in the face."
  git push heroku master
  

  • [Heroku

    Python Documentation](https://devcenter.heroku.com/articles/deploying-python)

  • HOW TO DEPLOY DJANGO PROJECT TO HEROKU