While Loop Implementation

print("-" * 10 + "Class Attendance Check" + "-" * 10)
response = input("Do you have class today? y/n")  # Initialize variable
while response == "y":  # Condition check
    print("Class is required")
    response = input("Do you have class today? y/n")  # Update variable

print("-" * 10 + "Sum from 1 to 100" + "-" * 10)
total = 0  # Store cumulative sum
counter = 1  # Initialize counter
while counter <= 100:  # Condition check
    total += counter
    counter += 1  # Update counter
print(total)

User Authentication Simulation with While Loop

attempts = 0  # Initialize attempt counter
while attempts < 3:  # Check maximum attempts
    # Get user credentials
    username = input("Enter your username:")
    password = input("Enter your password:")
    
    # Authentication process
    if username == 'ty' and password == '666666':
        print('Logging in...')
        attempts = 4  # Exit loop on success
    else:
        if attempts <= 2:
            print('Invalid credentials. You have', 2 - attempts, 'attempts remaining')
        attempts += 1  # Increment attempt counter

# Single branch condition
if attempts == 3:
    print("All three login attempts failed")

Nested Loops for Pattern Pritning

print('-' * 10 + 'Print 3x4 Star Matrix' + '-' * 10)
for row in range(1, 4):
    for col in range(1, 5):
        print('*', end='')  # Prevent line break
    print()  # Move to next line

print('-' * 10 + 'Print 5-row Right Triangle' + '-' * 10)
for row in range(1, 6):
    for col in range(1, row + 1):
        print('*', end='')
    print()

print('-' * 10 + 'Print Inverted 5-row Right Triangle' + '-' * 10)
for row in range(1, 6):
    for col in range(1, 7 - row):
        print('*', end='')
    print()

print('-' * 10 + 'Print 5-row Isosceles Triangle' + '-' * 10)
for row in range(1, 6):
    for space in range(1, 6 - row):
        print(' ', end='')
    for star in range(1, row * 2):
        print('*', end='')
    print()

Diamond Pattern with Nested Loops

rows = int(input('Enter number of rows for diamond:'))
while rows % 2 == 0:
    print('Please enter an odd number!')
    rows = int(input('Enter number of rows for diamond:'))
upper_half = (rows + 1) // 2

# Upper part of diamond
for i in range(1, upper_half + 1):
    for j in range(1, upper_half + 1 - i):
        print(' ', end='')
    for k in range(1, i * 2):
        print('*', end='')
    print()

# Lower part of diamond
lower_half = rows // 2
for i in range(1, lower_half + 1):
    for j in range(1, i + 1):
        print(' ', end='')
    for k in range(1, 2 * lower_half - i * 2 + 2):
        print('*', end='')
    print()

Holllow Diamond Pattern

print('Hollow Diamond Pattern')
rows = int(input('Enter number of rows:'))
while rows % 2 == 0:
    print('Please enter an odd number!')
    rows = int(input('Enter number of rows:'))
upper_half = (rows + 1) // 2

# Upper part
for i in range(1, upper_half + 1):
    for j in range(1, upper_half + 1 - i):
        print(' ', end='')
    for k in range(1, i * 2):
        if k == 1 or k == i * 2 - 1:
            print('*', end='')
        else:
            print(' ', end='')
    print()

# Lower part
lower_half = rows // 2
for i in range(1, lower_half + 1):
    for j in range(1, i + 1):
        print(' ', end='')
    for k in range(1, 2 * lower_half - i * 2 + 2):
        if k == 1 or k == 2 * lower_half - i * 2 + 2 - 1:
            print('*', end='')
        else:
            print(' ', end='')
    print()

Break and Cotninue Statements

# Break example
sum_value = 0
index = 0
while index < 20:
    sum_value += index
    if sum_value > 100:
        print('First number making sum exceed 100 is', index)
        break
    index += 1

# Break in for loop
sum_value = 0
for num in range(1, 20):
    sum_value += num
    if sum_value > 100:
        break
print('First number making sum exceed 100 is', num)

# Continue example
index = 0
sum_value = 0
while index < 100:
    if index % 2 == 1:  # Odd numbers
        index += 1
        continue  # Skip rest of loop body
    sum_value += index
    index += 1