Python: introduction

First release in 1991

Based on C and Java

Stable releases are: (2.7.x, 3.5.x)

Cross-platform

Object-oriented, imperative, functional programming, and procedural styles

Python: advantages

SimpleEasy to studyFree and open sourceHigh-level programming languagePortabilityExpansibilityEmbedabilityLarge and comprehensive standard librariesCanonical code

Python: syntax and semantics

Use whitespace indentation to delimit blocks

if, else and eliffor, whiletry, except, finallyclassdef (function and method)withpassassertyield (generator)importprint, print()self, this

Python: typing

str Character string 'Wikipedia'"Wikipedia""""Spanningmultiplelines"""

Bytearray, bytes

Sequence of bytes bytearray(b'Some ASCII')bytearray([119, 105, 107, 105])b"Some ASCII"bytes([119, 105, 107, 105])

list List, can contain mixed types [4.0, 'string', True]

tuple Can contain mixed types (4.0, 'string', True)

set Unordered set {4.0, 'string', True}

frozenset Unordered set frozenset([4.0, 'string', True])

dict Associative array {'key1': 1.0, 3: False}

complex Complex number 3+2.7j

Python: code sample

1 # Function definition is here 2 def printme(str): 3 """This prints a passed string into this function""" 4 print str 5 return 6 7 8 # Now you can call printme function 9 printme("I'm first call to user defined function!") 10

Files- .py, .pyc, .pyd, .pyo (prior to

3.5), .pyw, .pyz (since 3.5)

Packages- __init__.py

Python: class sample

1 class Person:2 3 def __init__(self, name): 4 self.name = name 5 6 def say_hello(self): 7 print "Hello, my name is", self.name 8 9 def __del__(self): 10 print '%s says bye' % self.name 11 12 p = Person('David Sanchez') 13 p.say_hello()14

This example includes class definition, constructor function, destructor function, attributes and methods definition and object definition.

""" This code sample will return: Hello, my name is David Sanchez David Sanchez says bye Process finished with exit code 0 """

Python: inheritance sample

1 class Person: 2 def speak(self): 3 print 'I can speak' 4 5 6 class Man(Person): 7 def wear(self): 8 print 'I wear shirt' 9 10 11 class Woman(Person): 12 def wear(self): 13 print 'I wear skirt' 14 15 man = Man() 16 man.wear() 17 man.speak() 18 19 woman = Woman() 20 woman.wear() 21 woman.speak() 22

""" This code sample will return: I wear shirt I can speak I wear skirt I can speak Process finished with exit code 0 """

Just like JAVA, subclass can invoke Attributes and methods in superclass.

Supports multiple inheritance.

1 class Alien(Person, Man, Woman): 2 pass

PyCharm: overview

IDE for Python language by JetBrains

Cross-platform

Web development frameworks (Django, Flask, ...)

Cross-technology development (JavaScript, SQL, HTML, CSS, ...)

Profiler, Code generation, refactoring

Database integration

PyCharm: IDE

Django: overview

Initial release: 2005

Free, open-source, ModelTemplateView web framework

Include optional C.R.U.D. interface

Caching and internationalization system

Database (PostgreSQL, MySQL, SQLite) easy integration and migration

Easy forms creation and manipulation

Django: process

Django: process

Django: process

Python Tools: overview

pip:- Package management system (like composer)- Install and manage software packages written in Python

virtualenv:- Isolate pip install in a python project

setuptools:- build and distribute a python app with dependencies on other packages

wheel:- setuptools extension for creating wheel distributions

Tools by Kaliop

Manage servers- Add- Edit- Remove

Manage databases- Add- Edit- Remove

Copy link to backup file- Copy last backup SQL file- Copy available backup SQL file

Project key

Project name

Project type- Maintenance- Project

Timesheet activities- Spécifications- Gestion de projet- Administration Système- Formations- Avant-vente- Développement Backend- Développement Frontend- Contrôle qualité- Direction Artistique- Web Design

Project lead- Nicolas Gommenginger- Thaïs Heuzé

nginx: used as a delivery server for static (JS, CSS, images) files.

gunicorn: WSGI HTTP Server

RabbitMQ: open source message broker software

Celery: asynchronous task queue manager

Celery is useful for background task processing and deferred execution in Django. Task queues are used to distribute work across workers.

Celery's components:

- message broker - component for exchange messages and tasks distribution between workers: RabbitMQ;

- worker - calculation unit, which execute task;

DockerStack

Overview

An utility to Dockerize your applications and generate minimal docker requires files:

➔ Dockerfile

➔ docker-compose.yml

➔ php.ini

Projects stored at:

/home/{user}/DockerStackProjects/

https://github.com/emulienfou/dockerstack

Available commands

●start: Build and start a new project

●stop: Stop docker container(s) for the current project

●build: Build a new or existing project

● rm: Remove one or more projects

●ps: List all created projects

●updb: Update database, providing an SQL file (!!! not yet available !!!)

Future features

➔ Improve docker-stack.yml file format

➔ Add support platform for framework & CMS

➔ Login to a Docker Hub account

➔ Graphic Interface (user-friendly)