Lecture # 9 - Conditionals and Boolean Data Type

Boolean Data Type (bool):

In Python, the boolean data type represents two possible values: True and False. Booleans are used in expressions and conditional statements to evaluate conditions and make decisions. The boolean data type is essential for controlling the flow of a program and implementing logic.

Checking Data Type:

x = 5
y = 10
a = (x == y) # 5 == 10 -> False 
b = (x < y) # 5 < 10 -> True
print(type(a))
print(type(b))

Output:

Conditionals:

Conditionals are the expressions that evaluate to either true or false.

if Statement:

In Python, the if statement is used for conditional execution. It allows you to execute a block of code if a certain condition is true.

Syntax:

if condition:
    #Code block to be execued if the condition is true

Example:

date = 23
if date >= 23:
    print("You'll have to pay your fee with late fee charges.")

Output:

if-else Statement:

if-else statement in Python allows you to execute one block of code if a condition is true and another block of code if the condition is false.

Syntax:

if condition:
    # Code block to be executed if condition is True
else:
    # Code block to be executed if condition is False

Example:

name = "Abdullah"
if name == "Ali":
    print("This is Ali's Computer.")
else:
    print("You're not owner of this Computer.")

Output:

if-elif-else Statement:

The if-elif-else statement in Python allows you to execute different blocks of code based on multiple conditions. It's useful when you have multiple conditions to check.

Syntax:

if condition1:
    # Code block to be executed if condition1 is True
elif condition2:
    # Code block to be executed if condition1 is False and condition2 is True
elif condition3:
    # Code block to be executed if condition1 and condition2 are False and condition3 is True
...
else:
    # Code block to be executed if all conditions are False

Example:

age = 17
if age >= 18:
    print("You are eligible vote.")
elif age == 17:
    print("You will be eligible to vote after 1 year.")
else:
    print("You are not eligible to vote.")

Output:

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Abdullah Bin Altaf
Abdullah Bin Altaf