Python Basics
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The document provides an overview of a Python programming course taught by Prof. Pooja B S, covering Python's features, syntax, and programming concepts such as object-oriented programming, handling strings and files, and networking. It outlines course objectives, outcomes, and applications of Python in various fields like AI and web development, as well as practical examples of basic programming principles. Additionally, it includes information on Python development environments and how to download Python.
![Operators and Operands
ďľ Arithmetic Operators:
ďľ Relational or Comparison Operators:
+ Addition [a+b]
- Subtraction [a-b]
* Multiplication [a*b]
/ Quotient [a/b] eg: 5/3=1.66667
% Remainder [a%b] eg: 5%3=2
// Floor Division [a//b] eg: 5//3=1
** Exponent [a**b] is equal to a^b eg: 2**3=2^3=8
< Less Than [a<b]
> Greater Than [a>b]
== Comparison [a==b]](https://image.slidesharecdn.com/pythonbasics-200813063818/85/Python-Basics-10-320.jpg)
![ďľ String Operations
ďľ Use + operator for string concatenation
ďľ Eg: x=â32â
y=â40â
print(x+y) #3240
ďľ User Input
ďľ Built in function: input()
ďľ Eg: 1] str1= input()
print(âEntered String is:â, str1) #Entered String is Hello Python!
2] x= input(âEnter a numberâ)
type(x) #<class 'str'>
3] x= int(input(âEnter a numberâ))
type(x) #<class âint'>](https://image.slidesharecdn.com/pythonbasics-200813063818/85/Python-Basics-14-320.jpg)
Python Basics
- 1. BASICS ON PYTHON PROGRAMMING PROF. POOJA B S
- 2. ďľ About the Course ďś Python is an interpreted, object-oriented, high-level programming language with dynamic semantics. Python is simple, easy to learn syntax emphasizes readability and therefore reduces the cost of program maintenance. Python supports modules and packages, which encourages program modularity and code reuse ďľ Course Objectives ďś Learn Syntax and Semantics and create Functions in Python. ďś Handle Strings and Files in Python. ďś Understand Lists, Dictionaries and Regular expressions in Python. ďś Implement Object Oriented Programming concepts in Python ďś Introduction to Network Programming in Python ďľ Course Outcomes ďś Explain basic principles of Python programming language ďś Interpret the fundamentals of Python and usage of various support libraries ďś Problem Solving and Programming Capability ďś To learn how to design and program Python applications
- 3. Introduction to Python: Basics of Python, Variables, Expressions, Statements ďľ Guido Van Rossum in 1991 ďľ Open Source ďľ General purpose programming language. ďľ Applications: ďś GUI Applications ďś Website Applications ďś Mobile Applications ďś Artificial Intelligence ďś Machine Learning Algorithms
- 4. Where Python is Used? ďľ Google ďľ Netflix ďľ Dropbox ďľ National Security Agency (USA) ďľ BitTorrent ďľ NASA Python Development Environments ďľ PyDev on Eclipse ďľ Notepad++ ďľ Komodo IDE ďľ PC (PyCharm) ďľ Bluefish ďľ Vim ďľ LiClipse ďľ IDLE (Integrated Development and Learning Environment)
- 5. How can I download Python? ďľ The python can be downloaded from the link given below: https://www.python.org/downloads/
- 6. Basics of Python Programming ďľ >>> Chevron ďľ Comments in Python: ďś # ďś ââââŚâŚâŚâŚâŚ..âââ or ââââŚâŚâŚâŚâŚâââ ďľ Interactive Mode and Scripting Mode ďľ Keyboard Interrupt: ďľ Ctrl+c ďľ Quit the program: ďľ quit() ďľ Interpreter v/s Compiler ďľ Types of Errors in a Program: ďś Syntax Errors ďś Logical Errors ďś Semantic Errors
- 7. Simple Programs 1. print(âHello! Welcome to Python Worldâ) # Hello! Welcome to Python World 2. print(Hello) #Error 3. print(âHelloâ) # Hello 4. print(âââHelloâââ) # Hello 5. X=10 #30 Y=20 print(x+y) 6. num1 = 1.5 #The sum of 1.5 and 6.3 is 7.8 num2 = 6.3 sum = num1 + num2 print('The sum of {0} and {1} is {2}'.format(num1, num2, sum))
- 8. Variables ďľ Variable is a named literal to store a value. ďľ Need not be declared before usage in python ďľ Use â=â to assign value ďľ Rules for naming a variable: ďś Variable name should not be a keyword ďś Should not start with a number or special character ďś Can only contain special characters â_â ď Eg: 1. 3a=5 #invalid 2. A$=10 #valid 3. if=15 #invalid
- 9. Values and Types ďľ The type of a value can be checked using âtypeâ function ďľ Eg: 1. type(âHelloâ) 2. type(3) 3. type(100.4) 4. type(2/3) 5. type(325%6) 6. type(2==3) 7. type(â500â) 8. type(â500â) 9. x=10 y=âHiâ print(x) print(y) type(x) type(y)
- 10. Operators and Operands ďľ Arithmetic Operators: ďľ Relational or Comparison Operators: + Addition [a+b] - Subtraction [a-b] * Multiplication [a*b] / Quotient [a/b] eg: 5/3=1.66667 % Remainder [a%b] eg: 5%3=2 // Floor Division [a//b] eg: 5//3=1 ** Exponent [a**b] is equal to a^b eg: 2**3=2^3=8 < Less Than [a<b] > Greater Than [a>b] == Comparison [a==b]
- 11. ďľ Bitwise Operators ďľ Assignment Operators ďľ Used to assign values to variables ďľ Compound Assignment Operator is: =+ ďľ Eg: x=3 y=5 x+=y #Same as x=x+y print(x) #8 & AND | OR ~ NOT ^ XOR >> Right Shift << Left Shift
- 12. ďľ Assign different types to variables in a single statement ďľ Eg: x, y, str = 3, 4.2, âHelloâ print(âx=â,x, ây=â,y,âstr=â,str) #x=3 y=4.2 str=Hello ďľ Expressions Combination of values, variables and operators is known as an expression. Eg: x=5 y=x+10 z=x+y-3
- 13. Order of Operations ďľ Evaluation of Expressions follows on PEMDAS rule P Parenthesis () E Exponent ** M Multiplication * D Division / and % A Addition + S Subtraction - Eg: print(2**3) #8 print(2**3**2) #512 print(5*2/4) #2.5 print(5/4*2) #2.5
- 14. ďľ String Operations ďľ Use + operator for string concatenation ďľ Eg: x=â32â y=â40â print(x+y) #3240 ďľ User Input ďľ Built in function: input() ďľ Eg: 1] str1= input() print(âEntered String is:â, str1) #Entered String is Hello Python! 2] x= input(âEnter a numberâ) type(x) #<class 'str'> 3] x= int(input(âEnter a numberâ)) type(x) #<class âint'>