Python

Introduction to Awesomness


from awesomness import *

Speaker

@ manoj pandey 


Why Python ?


  • Fast
  • Broad
  • Readability
  • Easy to learn
  • Open-sourced
  • Object-Oriented
  • It's dynamic
  • Python is a general purpose language
  • It's cross platform
  • And much more reasons

Python is fast


Python is faster than other
 "scripting" languages.

Python implemented specific parts
of language in C

Python has other implementations that
provide some solutions to increase
runtime speed dramatically.

PyPy

  • PyPy is an implementation of python written in python
  • PyPy implemented a JIT 
  • It's about 5time faster that Cython ( yeah Cython )


Python is broad

Python can be used in many different 
fields like:

  • Web development
  • System administration
  • Game development
  • 3D modeling
  • Testing 
  • Analyzing big data
  • . . . 

Readability


Just take a look

from some_package import some_method

def say_hello (name=none):
    if name is not none:
        print("Hello " + name)
    else:
        print("Hello world")

say_hello("yottanami")

It's easy to learn




  • Its syntax is very simple and English like
  • Python does not use wired symbols or structures
  • Lots of resources out there
  • Python is very popular

Free Software


Python is open source and free (libre)

It means that you can 
get the source code
change it as you need
and redistribute it

People can find bugs and fix them faster

Python is dynamic


What is a dynamic language ?
 new code can be executed during runtime
 without limitations


What's the point ?
It means that the user does not have to go through
 the compile-run-debug cycle every time he makes
 a change to the code

Python is general purpose


You can use python in
  • Desktop apps
  • Hand held applications
  • Embedded Systems
  • Electronics
  • Robotics
  • Game development
  • Manufacture
  • etc 

Cross Platform


This OS`s supports python:
  • GNU/Linux
  • BSD family
  • MS Windows
  • Android (It's Linux ofcourse)
  • Mac
  • iOS
  • Solaris 
  • .....

Who uses python?

  • NASA
  • Google
  • Youtube
  • Reddit
  • Dropbox
  • Disqus
  • Pinterest
  • Instagram
  • Mozilla
  • BitBucket
                       and you ?



Get Started


What do we need today ?



  • Python installed
  • pip, virtualenv
  • An Editor or IDE


Installation



Windows 

Linux/OSX

Editors & IDEs

  • Sublime Text ♥
  • Eclipse + pydev
  • gedit
  • Geany
  • Wing IDE
  • Visual Studio
  • Emacs
  • Kuso
  • Atom
  • Notepad++
  • VIM


Hello World !


print "Hello World!"


Zen of Python

import this

How to use Python



  • How to run python scripts
  • How to use Python shell
  • How python runs scripts
  • How to install packages using pip
  • Some useful packages

How to run a python script ?



  1. If target script contains hashbang section:
    $ python /path/to/target_script.py
$ chmod +x /path/to/target_script.py # another way
$ /path/to/target_script.py 
  2. If target script does not have hashbang section:
    $ python /path/to/target_script.py

Useful pakcages




  • numpy
  • requests
  • virtualenv
  • scrapy
  • beautifulsoup
  • nltk

A simple trick


Learn faster by:

  • `help` function
  • `dir` function
  • `__dict__` method

Basics


  • Variables
  • General types
  • Indentation & Code blocks
  • Operators
  • Conditions
  • Loops
  • Functions
  • Exceptions
  • Modules
  • OOP

Variables




  • What is a variable
  • How we define a variable
  • Variable scopes

Data Structures



  • String
  • Numbers
  • Lists
  • Tuples
  • Dictionaries

Strings




  • Strings define using single or double quote
  • Strings are immutable
  • characters of an string are accessible using
    [] operatore 

Numbers




Numbers are objects too


There are different types of numbers
Float, Integer, Long and etc

Lists




  • Lists are mutable
  • Think of lists as array in other langs but more flexible
  • List can have elements with different types
  • List elements are accessible by [] operator

Tuples






Tuples are just like lists but immutable

Dictionaries




  • Dictionaries are mutable
  • Dictionaries are lists with flexible indexes
  • Index of dictionaries can be an object
  • Dictionary values are accessible using [] operator

Indentation




  • What does it means ?
  • What is a code block ?
  • How we defines code blocks ?

Operators




  • Math operators ( +, -, *, /, **)
  • Logical operators ( <, >, <>, == , <=, >=, and, or, not)
  • Assignment operators (*=, +=, -=, /=)
  • Binary operators (<<, >>, &, |, ^)
  • Membership operators (in, not in)

Conditions & Loops




  • if - if/else
  • for
  • while
  • iterators


Functions



  • What is a function
  • What is a method
  • How to define a function
  • Function arguments
  • Return values

Exceptions




  • What is an exception?
  • When does exceptions raises?
  • How to catch exceptions

OOP



  • What is OOP ?
  • How does it help us?
  • How can i define a class ?
  • How can i define attributes ?
  • How can i define methods ?
  • What is inheritance ?

Where to get help ?



  • Python documentation
  • Search the web
  • Python forums
  • IRC channels
  • Mailing Lists


Resources



  • Learn Python the Hard Way - Zed A. Shaw
  • Python For Dummies : O'reilly
  • Byte of python : pdf available
  • Dive into python : pdf available

Do you have any question(s) ?

Many Thanks to

@cashrulz, @thepsyguy




manoj pandey

+91-9910089606 || http://manojpandey.me





try:
    run_a_workshop()
    print("Good job guys")
except PeopleDidNotLearn:
    print("We have to try harder")
finally:
    print("Heeeell yeah, It's finished")

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