Introduction to Python3 Programming Language

Tushar Mittal
@techytushar
Introduction To Python3

Agenda
➢ What is Python
➢ Why Python
➢ Installation
➢ Basic Syntax :
• Hello World !
• Numbers
• Strings
• Loops
• Conditional Statement
• List
• Dictionaries
• Tuples
• Functions
➢ Summary
➢ Q/A

Python
● High Level Programming Language for general
purpose programming
● Created by Guido Van Rossum
● Release in 1991
● Interpreted not Compiled
● Open Source

Guido Van Rossum
● Author of Python
● University of Amsterdam
-MA in Computer Science
● Google (2005 – 2012)
● Dropbox (2012-Present)
“ I was looking for a "hobby" programming project that would keep
me occupied during the week around Christmas. My office ... would
be closed, but I had a home computer, and not much else on my
hands. I decided to write an interpreter for the new scripting
language.. ”

Why was Python Named Python?
“ I needed a short, simple,
unique and slightly mysterious
name, so I decided to call it
Python.”

● Easy to Learn
● Simple Syntax
● Write Less. Do More.
● Code Readability
● Versatile and Flexible
Advantages

Possibilities
● Machine Learning
● Computer Vision
● Web Development
● Game Development
● Web Scraping
● Desktop Applications
● Automation.....

Machine Learning
● Chatbots
● Speech Recognition
● Anti Virus
● Cancer Detection
● Predicting Stock Prices
● Weather Forecast
● Humanoid Robots

Computer Vision
● Self Driving Cars
● Image Recognition
● Gesture Recognition
● Robots
● Image Enhancement

Web Development
● Instagram
● Youtube
● Pinterest
● NASA
● The Washington Post
● Mozilla

Web Scraping
● News Scraping
● Price Comparison
● Reviews
● Monitoring

Desktop Application
Tkinter PyQt

Installation
www.python.org
Installation

Talk is Cheap, Show me the Code
- Linus Torvalds
Basic Syntax

Hello World!
>>> print(“Hello World !”)
#include<stdio.h>
void main()
{
printf(“Hello World !”);
}
public class HelloWorld
{
public static void main(String[] args)
{
System.out.println("Hello, World");
}
}

Numbers
>>> a = 5
>>> type(a)
<class 'int'>
>>> (-7 + 2) * (10)
-50
>>> (2 ** 4)/4
4
>>> a = 5.0
>>> type(a)
<class ‘float’>
>>> 4/0
ZeroDivisionError: division by zero

Strings
>>> s = ‘Hello I am learning Python.’
>>> s
‘Hello I am learning Python.’
>>> s = “This is a n Multiline String.”
>>> s
‘This is a n Multiline String.’
>>> print(s)
This is a
Multiline String.
>>> s = “”” This is another way of
declaring multiline
string.”””
>>> s
This is another way of n declaring multiline n string.

String Opeartions
>>> s = “your name”
>>> s.title()
‘Your Name’
>>> s.upper()
‘YOUR NAME’
>>> s.lower()
‘your name’
>>> s.swapcase()
‘YOUR NAME’
>>> s + “ is awesome.”
‘your name is awesome.’

Loops
>>> for i in range(1,10):
print(i)
1....9
>>> i = 1
>>> while(i<10):
print(i)
i += 1
1....9
>>> for i in range(1,10,2):
print(i)
1 3 5 7 9

Conditional Statement
>>> a = 1
>>> if (a==1):
print(“Number is 1”)
Elif (a==2):
Elif (a==3):
Else:
print(“Wrong number.”)
Number is 1

List
>>> list = [1,4,3,2,7,6,5]
>>> print(list)
[1, 4, 3, 2, 7, 6, 5]
>>> print(list[1])
4
>>> list[1] = list[1] + 10
>>> list
[1, 14, 3, 2, 7, 6, 5]
>>> list = list + [20,10]
[1, 14, 3, 2, 7, 6, 5, 20, 10]
>>> for i in list:
print(i)
>>> 20 in list
True
( Upgraded version of Array )

List Operations
>>> list.sort()
>>> print(list)
[1, 2, 3, 5, 6, 7, 10, 14, 20]
>>> list.reverse()
[20, 14, 10, 7, 6, 5, 3, 2, 1]
>>> list.pop(0)
[14, 10, 7, 6, 5, 3, 2, 1]
>>> list.insert(2,’abc’)
[14, 10, ’abc’, 7, 6, 5, 3, 2, 1]
>>> list.append(‘xyz’)
[14, 10, ’abc’, 7, 6, 5, 3, 2, 1, ‘xyz’]
>>> len(l)
10

Dictionary ( Stores Key:Value Pairs )
>>> marks = {‘ram’:80, ’shyam’:90, ‘aditi’:85, ‘abhi’:88}
>>> marks[‘ram’]
80
>>> marks[‘abhi’] = 95
{'ram': 80, 'aditi': 85, 'shyam': 90, 'abhi': 95}
>>> marks[‘aman’] = 60
{'ram': 80, 'aman': 60, 'aditi': 85, 'shyam': 90, 'abhi': 99}
>>> for i in marks:
print(i,marks[i])
>>> ‘abhi’ in marks
True

Tuples ( Immutable data separated by comma )
>>> tup = ('this', 'is' , 'python' , 'workshop')
>>> tup
('this', 'is' , 'python' , 'workshop')
>>> for x in tup:
print(x)
>>> tuple(list)

Functions
>>> def func(a,b,c):
... sum = a+b+c
... return sum
>>> print(func(2,4,6))
#factorial using recursion
>>> def fact(n):
... if n == 0:
... return 1
... return n* fact(n-1)
>>> print(fact(5))
120

Q/A Time
Keep Coding!
Keep Innovating!
Thank You
:)

Introduction to Python3 Programming Language

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