Python Basics: From Beginner to Advanced

Chapter-3
 Conditional Statements
if Statement
Sometimes the programmer needs to check the evaluation of
certain expression(s), whether the expression(s) evaluate to True
or False. If the expression evaluates to False, then the program
execution follows a different path then it would have if the
expression had evaluated to True.
Based on this, the conditional statements are further classified
into following types; if, if……else, elif, nested if.


if Statement:

A simple if statement works on following principle,

 execute the block of code inside if statement if the
expression evaluates True.
 ignore the block of code inside if statement if the
expression evaluates False and return to the code
outside if statement.

, Example:

applePrice = 180
budget = 200
if (applePrice <= budget):

, print("Alexa, add 1kg Apples to the cart.")



Output:

Alexa, add 1kg Apples to the cart.

if-else Statement
An if……else statement works on the following principle,

 execute the block of code inside if statement if the
expression evaluates True. After execution return to the
code out of the if……else block.
 execute the block of code inside else statement if the
expression evaluates False. After execution return to the
code out of the if……else block.