Python Custom Functions Exercises

Define a function that prints Hello Python! on the console.

                '' print_hello_python():
    print("Hello Python!")

Call the function.

                def print_hello_python():
    print("Hello Python!")

''

( print_hello_python ) :

Modify the function that accepts a string and prints it on the console.

                def print_string(''):
    print(input_string)

print_string("Hello Python!")

This function takes a number and doubles it. Return the doubled value.

                def double_number(number):
    result = number * 2
    '' result


result = double_number(5)

print('The doubled number is:', result)

Combine the math operation and return into a single line instead of two lines.

                def double_number(number):
    # result = number * 2
    ''


result = double_number(5)

print('The doubled number is:', result)

number * 2 return =

How does this function work?

                def is_positive(number):
    if number > 0:
        return True
    else:
        return False

The is_positive function returns True if the input number is positive; otherwise, it returns False The is_positive function returns True if the input number is negative; otherwise, it returns False

What is the output of this code?

                def check_stock_availability(quantity):
    if quantity > 0:
        return "Product is in stock."
    else:
        return "Product is out of stock."


result = check_stock_availability(12)
print(result)

Product is out of stock Product is in stock

What is the output of this code?

                def check_password_strength(password):
    if len(password) >= 8:
        return "Strong password"
    else:
        return "Weak password"


password = "P@ssw0rd"
result = check_password_strength(password)

print(result)

Weak password Strong password

What is the output of this code?

                def calculate_shipping_cost(weight, destination):
    if weight <= 0:
        return "Invalid weight"

    if destination == "domestic":
        shipping_cost = 0.5 * weight
        return f"Domestic shipping: ${shipping_cost}"

    if destination == "international":
        shipping_cost = 1.5 * weight
        return f"International shipping: ${shipping_cost}"

    return "Invalid destination"


weight = 2.5
destination = "international"
result = calculate_shipping_cost(weight, destination)

print(result)

$1.25 $3.75

What does this function return?

                def check_number(number):
    if number > 0:
        return 'Positive'
    elif number < 0:
        return 'Negative'
   
    return 'Zero'


result = check_number(0)
print(result)

It displays an error message because we have omitted the elif statement for when the number is 0 It displays Zero because when the conditions are not met, the function simply returns Zero

What is the output of this code?

                def calculate_shipping_cost(weight, destination):
    if weight <= 0:
        return "Invalid weight"

    if destination == "domestic":
        shipping_cost = 0.5 * weight
        return f"Domestic shipping: ${shipping_cost}"

    if destination == "international":
        shipping_cost = 1.5 * weight
        return f"International shipping: ${shipping_cost}"

    return "Invalid destination."


weight = 2
destination = "internationl"
result = calculate_shipping_cost(weight, destination)

print(result)

International shipping: $3.0 Invalid destination

This function generates a username based on first name, last name and separator.
What is the output of this code?

                def generate_username(first_name, last_name, separator):
    username = f'{first_name}{separator}{last_name}'
    return username


first_name = 'Emma'
last_name = 'Smith'
result = generate_username(first_name, last_name, '_')

print(result)

Emma Smith Emma_Smith

This function generates a username based on the first name, last name, and separator.
Modify the function to utilize an underline as the optional value.

                def generate_username(first_name, last_name, ''):
    username = f'{first_name}{separator}{last_name}'
    return username


first_name = 'Emma'
last_name = 'Smith'
result = generate_username(first_name, last_name, '.')

print(result)

= separator '_'

What is the output of this code?

                def generate_username(first_name, last_name, separator = '_'):
    username = f'{first_name}{separator}{last_name}'
    return username


first_name = 'Emma'
last_name = 'Smith'
result = generate_username(first_name, last_name)

print(result)

Emma_Smith It displays an error message because the function requires three parameters, but we have only passed two values to the function

What is the output of this code?

                def generate_username(first_name, last_name, separator = '_'):
    username = f'{first_name}{separator}{last_name}'
    return username


first_name = 'Emma'
last_name = 'Smith'
result = generate_username(first_name, last_name, '.')

print(result)

Emma_Smith Emma.Smith

Python Exercises for Write Your Functions

If you've faced difficulties with these exercises, take a look at Write Your Functions Module on my Python course.

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Happy Coding!
Behnam Khani

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Python Custom Functions Exercises

Python Exercises for Write Your Functions