Python Tutorial 4 : Decision structures and if statements

In this video by Quordnet Academy how to use Decision structures and if statements in Python have been discussed.
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Python if else
There comes situations in real life when we need to make some decisions and based on these decisions, we decide what should we do next. Similar situations arises in programming also where we need to make some decisions and based on these decisions we will execute the next block of code.

Decision making statements in programming languages decides the direction of flow of program execution. Decision making statements available in python are:

if statement
if..else statements
nested if statements
if-elif ladder
if statement

if statement is the most simple decision making statement. It is used to decide whether a certain statement or block of statements will be executed or not i.e if a certain condition is true then a block of statement is executed otherwise not.

Here, condition after evaluation will be either true or false. if statement accepts boolean values – if the value is true then it will execute the block of statements below it otherwise not. We can use condition with bracket ‘(‘ ‘)’ also.

As we know, python uses indentation to identify a block. So the block under an if statement will be identified as shown in the below example:

if condition:
statement1
statement2

The if statement alone tells us that if a condition is true it will execute a block of statements and if the condition is false it won’t. But what if we want to do something else if the condition is false. Here comes the else statement. We can use the else statement with if statement to execute a block of code when the condition is false.

i is greater than 15
i'm in else Block
i'm not in if and not in else Block
The block of code following the else statement is executed as the condition present in the if statement is false after call the statement which is not in block(without spaces).

nested-if

A nested if is an if statement that is the target of another if statement. Nested if statements means an if statement inside another if statement. Yes, Python allows us to nest if statements within if statements. i.e, we can place an if statement inside another if statement.

Nested_if

Here, a user can decide among multiple options. The if statements are executed from the top down. As soon as one of the conditions controlling the if is true, the statement associated with that if is executed, and the rest of the ladder is bypassed. If none of the conditions is true, then the final else statement will be executed.

Syntax:-

if (condition):
statement
elif (condition):
statement
.
.
else:
statement
Flow Chart:-
if-else-if-ladder

Example:-
i = 20
if (i == 10):
print ("i is 10")
elif (i == 15):
print ("i is 15")
elif (i == 20):
print ("i is 20")
else:
print ("i is not present")
Output:
i is 20

Possibly if you have doubt comment below and let me understand what else I can help you with.
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[tungtang]

Wow 👋 very fascinating tutorial, looks hard my friend. I love it. Thanks for sharing supporting stay connected 💚