Lecture1_py 2.pdf…………………………………………..……………

Programming
Translator
Machine Code
(Compiler / Interpreter)
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What is Python?
Python is simple & easy
Free & Open Source
High Level Language
Developed by Guido van Rossum
Portable Apna College

Our First Program
print("Hello World")
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Python Character Set
Letters – A to Z, a to z
Digits – 0 to 9
Special Symbols - + - * / etc.
Whitespaces – Blank Space, tab, carriage return, newline, formfeed
Other characters – Python can process all ASCII and Unicode characters as part of data or literals
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Variables
name = "Shradha"
age = 23
price = 25.99
A variable is a name given to a memory location in a program.
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Memory
name = "Shradha"
age = 23
price = 25.99
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Rules for Identifiers
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Data Types
Integers
String
Float
Boolean
None
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Keywords
Keywords are reserved words in python.
*False should be uppercase
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# Single Line Comment
"""
Multi Line
Comment
"""
Comments in Python
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Arithmetic Operators ( + , - , * , / , % , ** )
Relational / Comparison Operators ( == , != , > , < , >= , <= )
Assignment Operators ( = , +=, -= , *= , /= , %= , **= )
Logical Operators ( not , and , or )
Types of Operators
An operator is a symbol that performs a certain operation between operands.
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Type Conversion
a, b = 1, 2.0
sum = a + b
a, b = 1, "2"
sum = a + b
#error
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Type Casting
a, b = 1, "2"
c = int(b)
sum = a + c
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int ( input( ) ) #int
Input in Python
input( ) #result for input( ) is always a str
float ( input( ) ) #float
give code eg of all 3
input( ) statement is used to accept values (using keyboard) from user
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Let‘s Practice
Write a Program to input 2 numbers & print their sum.
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Let‘s Practice
WAP to input side of a square & print its area.
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Let‘s Practice
WAP to input 2 floating point numbers & print their average.
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Let‘s Practice
WAP to input 2 int numbers, a and b.
Print True if a is greater than or equal to b. If not print False.
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Lecture1_py 2.pdf…………………………………………..……………

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Lecture1_py 2.pdf…………………………………………..……………