1_input_validation.py

# Why do we make functions?
# Several reasons, including
# To split a complex task in to simpler subtasks
# To move detail out of the flow of the program

# It can help find bugs in programs - is there a bug in this program? 

# Validation is a good example of removing detail


price_per_item = 5
quantity = int(input('Enter quantity, between 0 and 100: '))

# What happens if I type 'cat' instead of a number?
if quantity < 0 or quantity > 100:
    print('Error, invalid quantity')
    quantity = int(input('Enter quantity, between 0 and 100: '))


total = price_per_item * quantity

print(f'The total for {quantity} items at ${price_per_item} each is ${total}')

1_input_validation_exception_handling.py

# Why do we make functions?
# Several reasons, including
# To split a complex task in to simpler sub-tasks
# To move detail out of the flow of the program
# It can be easier to spot bugs in a function - less code to think about

# Validation is a good example of removing detail


def main():
    price_per_item = 5
    quantity = get_quantity_between_0_and_100()
    total = price_per_item * quantity
    print(f'The total for {quantity} items at ${price_per_item} each is ${total}')


def get_quantity_between_0_and_100():

    quantity = -1

    # What happens if I type 'cat' instead of a number?
    while quantity < 0 or quantity > 100:
        try:
            quantity = int(input('Enter quantity, between 0 and 100: '))
        except ValueError:
            print('Error - quantity is not an integer')

    return quantity


main()

1_input_validation_with_functions.py

# Why do we make functions?
# Several reasons, including
# To split a complex task in to simpler subtasks
# To move detail out of the flow of the program
# It can be easier to spot bugs in a function - less code to think about 

# Validation is a good example of removing detail

def main():
    price_per_item = 5
    quantity = get_quantity_between_0_and_100()
    total = price_per_item * quantity
    print(f'The total for {quantity} items at ${price_per_item} each is ${total}')


def get_quantity_between_0_and_100():
    quantity = int(input('Enter quantity, between 0 and 100: '))

    # What happens if I type 'cat' instead of a number?
    while quantity < 0 or quantity > 100:
        print('Error, invalid quantity')
        quantity = int(input('Enter quantity, between 0 and 100: '))

    return quantity


main()

1_validation_total_function.py

# Why do we make functions?
# Several reasons, including
# To split a complex task in to simpler sub-tasks
# To move detail out of the flow of the program
# It can be easier to spot bugs in a function - less code to think about

# Validation is a good example of removing detail


def main():
    price_per_item = 5
    quantity = get_quantity_between_0_and_100()
    total = calculate_total(price_per_item, quantity)  # arguments
    print(f'The total for {quantity} items at ${price_per_item} each is ${total}')


def calculate_total(price, number_of_items):  # 2 parameters
    total = price * number_of_items
    return total


def get_quantity_between_0_and_100():

    quantity = -1

    # What happens if I type 'cat' instead of a number?
    while quantity < 0 or quantity > 100:
        try:
            quantity = int(input('Enter quantity, between 0 and 100: '))
        except ValueError:
            print('Error - quantity is not an integer')

    return quantity


main()

2_id_card.py

# Print welcome message
print('Welcome! College ID Card Generator Program')

# Get user's name as it should be printed on their ID card.
# Make sure not empty, not longer than 60 characters
name = ''
while len(name) == 0 or len(name) > 60:
    name = input('Please enter your name to print on your ID card. \nIt should not be longer than 60 characters: ')

# get star ID. make sure 8 letters!
star_id = ''
while len(star_id) != 8:
    star_id = input('Please enter your StarID. Remember it should be 8 characters long: ')

# StarID should be displayed in lowercase
star_id = star_id.lower()

print('Here is a preview of your ID card')

# Print ID Card
college = 'Minneapolis College'
school_image = '🏫'

width = 60
text_width = width - 2
horizontal_line = '+' + '-' * text_width + '+'
spaces = ' ' * text_width
print(horizontal_line)
print(f'|\u001b[35;1m{college.center(text_width)}\u001b[0m|')    # https://www.lihaoyi.com/post/BuildyourownCommandLinewithANSIescapecodes.html
print(f'|{school_image.center(text_width)}|')
print(f'|{spaces}|')
print(f'|{name.center(text_width)}|')
print(f'|{spaces}|')
print(f'|{star_id.center(text_width)}|')
print(horizontal_line)